The rise of the Vulpins

by Swell Times Ahead

A brilliant scientist creates a serum designed to transform himself into a powerful, human-fox hybrid. His transformation allows him to grow in both size and strength, but also unlocks an uncontrollable urge to reproduce. As the scientist gives birth to litter after litter of increasingly powerful offspring, his body swells with power, and he becomes a being beyond human comprehension—part creator, part predator.

Dr. Arthur Hawke was a man driven by ambition. A scientist of great intellect, he had always dreamed of pushing the boundaries of human potential. Over the years, he’d studied genealogy, biology, and animal physiology among other fields, hoping to unlock a way for humanity to evolve. He wasn’t just looking for a mere leap of intellect or strength, but a transformation that could merge the most desirable traits of the animal kingdom with that of humankind.

In the laboratory that had become his sanctuary, Dr. Hawke completed a breakthrough that he believed would finally allow him to achieve his goal. He had synthesized a serum that could modify the recipient’s body, rewriting their genetic code from the ground up and combining it with a donor’s DNA. It could effectively turn any creature, human or otherwise, into a hybrid species.

Dr. Hawke knew immediately which animal he would use to supply the donor DNA. He derived it from a fox—an animal that was nimble, clever, and ferocious. After several months of testing the serum on lab rats, refining it to perfection, he decided he was ready for the next step: Human trials.

But it was notoriously difficult to gain permission for human testing, even when you worked in a lab funded primarily by the military. Requests could take years to be processed, if they didn’t simply get rejected altogether. Thankfully, Dr. Hawke had a simple plan to bypass this: he would inject himself with the serum.

Using oneself as a guinea pig was a time-honoured tradition among scientists after all, and it wasn’t like he hadn’t taken precautions. He had formulated a less potent version of the serum that would cause the transformation to be temporary, a brief experiment to prove the viability of his work. For a few minutes he would become faster, stronger, and more attuned to his environment while retaining his human mind, altering his body to mirror the physical prowess and sharp instincts of a fox. Then he would return to his old self and document the experiment.

Dr. Hawke picked up the vial of altered serum, labelled VULPIN-TF01, and filled a syringe. Standing before the mirror, he hesitated for only a moment before he plunged the vibrant amber liquid into his vein.

At first, nothing seemed to happen. He watched his reflection carefully, waiting for some physical change to manifest. His pulse quickened, but it was only out of excitement for things to come. He removed his clothes in case the changes had simply been too subtle for him to notice. He stared into the mirror, looking over every inch of his pale, thin body for any signs of transformation. But there was nothing.

He counted the minutes, worrying that something had gone wrong. Had he diluted the serum too much? Should he have used a bigger dose? He racked his brain for a solution, but then an intense heat spread through his body.

His breath caught in his throat, and he staggered slightly, his hands gripping the edge of his workbench. His muscles tightened as reshaped themselves from within. They throbbed and expanded, turning his silhouette from that of a scrawny scientist to one with a well-toned physique. His bones began to shift and elongate, his limbs stretching in ways that felt unnatural. His spine arched as it reformed, each vertebrae clicking into place like a perfect puzzle.

His face distorted as his nose lengthened and flattened into a snout, his teeth sharpening into pointed canines. He felt his hands growing thick padding, fur sprouting from his skin in thick, russet patches. As his senses heightened, he gained a sudden, overwhelming awareness of everything around him; the distant hum of the lab’s ventilation, the scent of chemicals in the air, the sound of his quickened heartbeat.

He was beyond thrilled with the success of the serum, but tried to maintain an air of professionalism as he took mental notes of the changes. He raised his arms over his head, examining each of his newly enhanced muscle groups. His once frail arms were now thick, corded with muscles that rippled beneath his skin. He flexed his biceps, then turned his head to the side, admiring the sweep of muscle that now covered his shoulders.

His chest expanded as he inhaled deeply, and he watched as his pectorals flexed and contracted with each breath. He ran his hands down his body, feeling the rippling contours of his abs. His hands ran over the hardened surface of his stomach, tracing the sharp lines of muscle that had replaced the soft layer of fat. It was as though the very core of his body had been reborn—each contraction of his muscles sending a thrill through him. The serum had made him taller, stronger, a perfect specimen, a marvel of scientific engineering! He watched as his dick morphed, stretching into a point, a distinct “knot” forming at its base. It rose slowly, pulsing with the rhythm of his heartbeat. Though he did not dare admit it to himself in that moment, his new body definitely aroused him.

But then the changes continued.

He could feel something more—an unsettling pressure building in his abdomen. His stomach tightened, and the sensation shifted from discomfort to something far more. He reached down, and his heart skipped a beat as he felt his stomach swelling, not with muscle, but with... something else.

His thoughts scrambled as he stumbled closer to the mirror. The transformation looked to be complete—his reflection was that of a large, bipedal fox who still possessed the proportions of a man. Yet his stomach bulged, swelling with an unnatural fullness.

Panic surged through him. In his haste to begin the human trials, he had neglected to properly test this altered formula, and so his body triggered a biological response he did not anticipate. His body—once sleek and agile—was now heavy with the weight of his expanding abdomen. It continued to grow at an alarming rate, stretching his new fur and skin. He gasped as his chest tightened, breaths coming in short, sharp bursts. He felt something shifting within, watching as his stomach distended unevenly from a building pressure. Something was pushing at his stomach. Lurching. Kicking.

It was then that he realized he was pregnant.

More growth hit him in waves, each expansion sending hot flashes through his body. He stumbled backwards, unable to tear his eyes away from his growing stomach. His once confident, controlled mind spiralled into confusion. He was an entirely new creature, with the power and instincts of a fox, but he was still a man! How could he possibly be pregnant?

As the minutes passed, the swelling continued, and the pain grew unbearable. His once lean and muscular frame filled with rapidly developing life. He could feel the stirrings of multiple creatures within him as they continued to grow rapidly, pulling his skin taut as his stomach stretched and swelled.

Then the first contraction hit.

He fell onto his back, gasping as he clutched his swollen abdomen. He groaned a low, animalistic sound as the overwhelming sensation of gestation continued to build. He could feel them inside him, pressing on his ribs, his organs, as if there was no space left for him to breathe. He felt his hips shift and widen in preparation. A stronger contraction made him shout in pain. The next caused his back to arch, and then another made him claw frantically at the tiles beneath him. As his breathing quickened, he felt a cavity stretch open beneath his groin. And then he was hit with the strongest contraction yet.

With a final, sharp cry, his body began to birth the litter. The birth came in a torrent, as if his body could not expel the life within him quickly enough. The pain was nearly unbearable as one by one, they emerged—one, then two, then five—seven fox kits in total, their fluid-covered fur shimmering in the lab’s light.

With nothing left to expel, he lay on the floor, panting, his body trembling with exhaustion. He mustered as much strength as he could as he raised his head and looked at the newborns. They were not fully human, not fully fox, but something in between—muscular, sleek, wild-eyed. Their bodies reflected his own transformation, a perfect hybrid of both species.

Dr. Hawke’s mind swam with disbelief. He had created life. The power of the serum had not just altered his body, it had changed the very essence of what he was. In that moment, he realized he was no longer just a man. He was something else—an evolution, a creature of power, intellect, and instinct. A new species.

He was a Vulpin.

Dr. Hawke had barely caught his breath when his kits nudged at his side. His mind was still reeling, overwhelmed by the sheer enormity of the transformation. Seven kits had been born, each one a blend of fox and human DNA, their fur gleaming in shades of russet and gold. He marvelled at the life he had created, but something else was stirring deep within him, something he had not anticipated.

It was an urge. A primal, deep-seated need that gnawed at his consciousness, distracting him from any rational thought. The serum had given him strength, agility, and heightened instincts. But as his body had transformed, so too had his mind. His thoughts were increasingly clouded by a desire to... mate.

He felt it in every fibre of his being: a hunger, a drive to reproduce. His belly, still throbbing with the echoes of the recent birth, pulsed with the instinct to carry more life. Though his pregnancy had obviously been painful, the thrill he felt, of feeling his offspring grow inside of him and emerge from his newly formed vagina, had overshadowed it.

The kits beside him instinctively pawed and nuzzled at their father, blind and helpless. He quickly pushed the thoughts aside, needing to address the immediate issue at hand. He carefully scooped up the kits in his arms, lifting them off the cold tiles into the warmth of his chest. How would he care for these creatures? He had never raised a child before, let alone seven. And how would he explain this to the facility staff?

Suddenly, his mind snapped back to reason. He was Dr. Hawke, a man of science, not a simple beast. These creatures would need to be caged and studied, like the rats he had used in his tests to perfect the serum. Besides, he had never been fond of children. But he felt conflicted. These kits... As the one who birthed them, he had an obligation to care for them, did he not?

As his mind ran wild trying to reason with his current situation, the kits began to kneed and suckle instinctively at his chest. Reacting to their stimuli, Hawke’s chest swelled with the production of milk, and his animal instincts flared up once more.

Entranced by this new development, he distributed the kits evenly along his torso, allowing them to latch onto the extra nipples that had formed during his transformation. He lied down onto his back to better ensure they didn’t fall. He reasoned that the transformation would only be temporary, so he should at least take advantage of this opportunity to study the changes the serum had brought to his body. “Yes,” he thought to himself, “I can worry about all this later.” For now, he simply needed to catch his breath.

He relaxed, beginning to enjoy the feeling of his suckling offspring. As they nursed from him, the kits grew rapidly. He could see the first signs of their maturity in the lengthening of their limbs and the sharpness of their eyes. What should have taken months was happening in minutes. The serum’s effects were far more profound than he had realized, accelerating their growth at an impossible rate. They were already becoming nearly as large as full-grown foxes, their fur sleek and wild.

Dr. Hawke’s chest was heavy with a fullness that his muscle growth alone couldn’t explain. He felt a strong sense of pride, and a growing desire to expand his pack further. His body thrummed with energy, his mind drifting back to the primal drive coursing through him. He wanted—no, needed to breed.

He staggered to his feet, pushing the now adolescent kits off of himself. He had allowed himself to lose focus on his experiment, and its effects had clearly been disastrous. Not only that, but he should have changed back by now. The serum was only meant to transform him for thirty, maybe forty minutes at best. What would the military think if they saw him like this? Would they arrest him? Put him down, even? If he didn’t remedy this immediately, things would only get worse.

He tried to concentrate, to think clearly. “I need to reverse this,” he thought, his fur covered hands shaking as he rushed back to his desk. He fumbled through the notes that he had made just the night before, scrambling to find a solution. But his mind was a mess. Every page seemed to blur before his eyes. His lab, once a place of methodical scientific inquiry, now felt like it harboured only chaos. He became lost in the thick, tangled brush of his instincts.

He felt a wetness developing between his legs, an increasing pressure in his crotch as his cock pulsed and became erect. The primal urges were overtaking him. He felt a need to penetrate, to shove his knot deep into another and fill them with his virile seed; meanwhile his vulva pulsed in tandem, radiating a desire to be filled, for the emptiness in his abdomen to teem with offspring. The rational thoughts he had held onto just moments before evaporated like smoke. His heartbeat quickened as the surrounding air thickened with tension.

But there were none nearby that could satisfy his needs, nobody that he could fuck. Clutching onto his desk, he reached for his cock with his other hand, hoping to relieve the rising pressure. As soon as he gripped his dick, it surged with excitement, thrumming between his fingers. He stroked and tugged at his flesh with his bulky fingers, but it brought pain to his sensitive member, doing little to calm his ever-increasing urge. Instinctively, he reached down between his legs, feeling the slick fluid accumulating between his calves. He scooped some into his palm, then lubricated his cock. He then stroke as quickly as he could.

He panted wildly, falling to his knees as he felt the slow build of climax within. His tail whipped furiously, his ears laying flat atop his head as his mind filled itself with nothing but the need for release. It couldn’t come fast enough, his pelvis thrusting involuntarily as he continued to stroke furiously. He could feel his cock throb, lengthen, engorge with the ever-increasing need to cum.

Meanwhile, fluid dripped down his thighs, his vulva pulsing violently. He spread more of his fluids onto his cock, keeping it slick and stimulated. But it wasn’t enough. Hawke soon could no longer hold on to his desk, rolling onto his back so that he could properly stimulate both of his organs at once. He pushed his clawed fingers deep into his hole, his whole body twitching as he stroked his walls every which way.

As Hawke’s need for release continued to grow, so did his frustration. “If only there was somebody,” he thought. “If only I had a mate!” Soon his mind filled with fantasies of others like him, intelligent fox-like creatures who would penetrate him, carry his seed, and spread his progeny. He imagined his stomach swelling once more, the feeling of young pushing against his flesh as they expanded within him. He imagined himself birthing dozens, no, hundreds of kits. They would grow before his eyes, thrive, and eventually find mates of their own to further spread his legacy. They would bear thousands of generations, each one stronger than the last, until the entire world became filled with his Vulpin lineage.

As the fantasy reached its climax, so did Hawke. He came for what seemed like an eternity, screaming from the explosion of pleasure throughout his entire body. He convulsed from the orgasm, squirting various fluids all over the tiled floor. It left him panting for breath. He lay still for several minutes in order to catch his breath.

Though it had exhausted him, Dr Hawke still felt a tinge of desire in the back of his mind. He could sense that masturbation had only offered him some temporary relief. The instincts that filled his transformed mind still filled him with the desire to mate, to see his new species propagate.

He slowly sat up, his body still aching from the transformation and the intense orgasm. He felt a small amount of pride seeing the puddle of cum he had created. But he pushed the thought aside: there was work to be done.

Dr. Arthur Hawke sat on the cold tiled floor of his lab, his body a perfect amalgamation of human and fox. His fur bristled with the memory of the frantic transformation that had overtaken him an hour ago, causing his once-clear mind to be submerged beneath an ocean of raw, primal urges. He had succumbed to the overwhelming need to reproduce, causing him to masturbate with an intensity he had never felt before.

For the time being, his body was satisfied. The throbbing in his genitals diminished as his thoughts became clearer. He saw his reflection in the mirror across the room and rushed back to his senses.

He noticed that his body had grown larger since he last examined it. His muscles had thickened a noticeable amount, and his height had increased by what he estimated to be several inches. He did not know when these changes had taken place, nor what other changes may soon come. “How could this have happened?” Dr. Hawke rasped, his voice a deep fox-like growl. He then heard a noise behind him.

Hawke turned to see the seven Vulpins he had birthed. Their bodies had matured at a remarkable pace, now fully grown. They were far larger than the average fox, nearly as big as wolves. They were now watching him, eyes glowing with intelligence that was both unnerving and feral. The largest Vulpin, a male with dark amber eyes, stepped forward, his hackles raised.

Dr. Hawke froze. The air was thick with the scent of cum and various other fluids, and he felt flush with embarrassment. Had his offspring been watching him this whole time? He quickly stood to his feet, his still damp hands grasping at the desk for support.

The largest kit snarled at the sight of Hawke’s protruding cock, and that sound triggered something deep inside Hawke. He felt revolted by the thought of being driven to mate with his offspring, quickly rendering him flaccid. Thankfully, it seemed the feeling was mutual, but new worries crept into his mind. Now that they had grown, would his kits also feel the urge to mate? Would they have the mental fortitude to resist mounting one another? Or worse, mounting him?

Such thoughts filled Dr. Hawke with a renewed determination to reverse the changes in himself. Then it hit him—the antidote! How could he have forgotten? He had created it in case something went wrong with his experiment. It could reverse the transformation, the growth of his body and, most importantly, curb the ever-growing sexual urges that had taken over him.

He turned to face his workbench, his claws scraping against the surface as his fox-like senses keyed into the chemical smells around him. He pushed aside the vial of modified serum—the one that had started all of this madness—and reached for the antidote. As he prepared a new syringe, Dr. Hawke began outlining in his mind the steps he would take once he restored his body.

First, he would need to find some way to deal with the kits. The facility housed many animals, so there were plenty of cages available to contain them. Second, he would need to write a detailed report of the events that had transpired. Unfortunately, this would also mean reporting the incident to the administration. He would probably be harshly reprimanded, if not outright fired.

Hawke’s pace slowed as he continued to imagine how the scenario would unfold. Whether or not he got fired, someone else would need to be assigned to the Hybridization project. He wouldn’t be able to see the kits again. The kits... his kits... would be treated like the other lab animals. Confined to cages, suffering through various tests and experiments for the rest of their lives.

He looked back at them. To his amazement, they were trying to imitate him, shakily standing on their hind legs. They poked and sniffed at the various objects strewn about the lab, curious about the world around them. No, these were not mere animals. They were intelligent, beautiful creatures, and they deserved to roam free. To live in the wilds, to hunt and thrive. But how could he possibly free them from the facility without notice? There were cameras all over the place, and armed guards stationed at every exit. Even if they made it out alive, the government would hunt them down. Their chances at survival were essentially zero.

As Hawke held the antidote filled syringe in front of his eyes, he felt a primal urge rise inside of him. But this time, it was a deep paternal instinct. A desire to see his progeny run free, to escape into the wilds and thrive. To reproduce, just as he did.

He tried to think of an alternative solution. As his eyes drifted across his workbench, they rested on the vial of modified serum. The main reason he had altered the original formula was because his previous test subjects were much smaller; undiluted, the serum would bring an immense increase in the size and strength to a fully grown human. If he administered it to himself now, his power would become tremendous.

Yes, that was it! He could break out of the facility with his kits in tow, helping them escape far away into the wilderness where nobody could hurt them. He would just need to bring the antidote with him and administer it later once his children were safe. Far from the labs, far from governments and their military. Far from humanity.

He looked at the rack of vials within the cabinet across the room. The concentrated version of the serum glowed red within a collection of large glass containers. His heartbeat quickened as the surrounding air thickened with tension.

Hawke then pressed his palms to his temples in frustration. Even if he helped his children escape, without proper mates, the whole lineage would slowly die out. The superior species he had wanted to create would flicker out before it reached its full potential. It just wasn’t fair. He had been so close to perfection.

The air grew thick with the scent of his own kits, of fur and animalistic need. He could tell that the instinct was rising in his offspring, just as it had in himself. At first it clouded his thoughts, but then he felt a clarity as a solution formed in mind. What if... he created mates for them?

It was an elegant solution. They would seek other humans to administer the serum to, transforming them into Vulpins. The species would need a decent amount of genetic diversity to thrive, so he would need to transform about a hundred humans. Maybe two hundred, just to be safe. Yes, with that many Vulpins, there would be enough mates for both him and his offspring.

His thoughts continued to spiral, twisting his rationality. Sure, the humans might not be receptive to the idea at first, but as soon as they transformed like he did, they would be happy with their newfound power. He became excited by the prospect of gaining a mate. Gaining mates. Enough to satisfy his urges whenever they arose. He felt his cock throb harder, aroused by the possibilities.

He quickly made his way to the cabinet and began filling dozens of syringes with the serum, storing them inside a leather bag for safekeeping. He could feel the excitement rising in him, filling his body with heat. The kits paced excitedly, knowing as if by instinct that something extraordinary was coming. “Yes,” thought Hawke, “this is what I was meant to do. To spread this gift to others, to help humanity ascend. We will bring humanity into a new era, the age of the Vulpin.”

His belly—still feeling the remnants of his previous litter—pulsed, aching as if ready to carry another. He stood shakily, his powerful limbs struggling against the urge to collapse back into a feral haze. But his thoughts came together like scattered pieces of a puzzle, snapping into place with newfound purpose. Finally, as he filled the last few syringes, he set one aside for himself.

He tried to focus, to block out the growing pressure in his loins. Just a little longer, then he would have everything he desired. He took his designated syringe, filled with the original formula, and returned to the workbench where the vial of modified serum stood. He was practically salivating in anticipation of the changes he would experience. His cock was so hard that it pressed against his stomach, his knees shaking as his vulva pulsed faster, dripping onto the floor below. He stuck the needle into the vial, and as he pulled the plunger the two formulas mixed with one another, the glow within the syringe pulsing brighter as they swirled within.

His eyes blurred as his mind came close to slipping again. The primal call was so strong. But he fought it. He did not want to let go of this moment, scared he might lose the will to go through with his plan. It was for the good of his children. For the good of humanity.

He forced the syringe into his arm; the needle sank deep into his transformed skin. The mixture coursed through his veins, and for a moment, his human mind was afraid of what he had done.

A sharp pain shot through his bones. He gasped, his trembling fingers dropping the syringe. He clutched the edge of the counter to steady himself, but the pain only intensified. His skin tingled, stretching and pulling as if it were being reshaped from the inside out. His muscles swelled and thickened, his frame expanding with every breath.

His body surged outward. He felt a deep ache, a painful but exhilarating expansion as his muscles swelled. They became firm, round, and massive, the fibres expanding row upon row.

His pecs inflated, growing outward and upward. His shoulders were so broad now that they’d barely fit through a door frame. His quads expanded, filling out while his calves hardened into solid muscle, the definition so extreme that even the smallest movements made his legs flex and bulge.

Hawke couldn’t stop himself from letting out a loud moan as the muscles stretched tighter and tighter. His bones cracked and elongated as he surged in height. Every step he took felt like he was walking on pillars of strength, each muscle group working in perfect harmony as his body grew more powerful, more potent, a force of nature begging to be unleashed.

As Hawke stood in the centre of his lab, flexing and admiring his new form, he felt his stomach bloat. He placed both hands on the hard, carved lines of his six-pack, which quickly disappeared behind the rapid expansion happening within him. The thought of pregnancy excited him, erasing all doubts that may have lingered in his mind.

His kits retreated to the far side of the lab, sensing the storm that was about to be unleashed, though they were not afraid. They looked upon their progenitor with reverence and awe, watching as his transformation intensified by the second.

Hawke’s stomach lurched outward. His skin burned with heat as it continued to stretch and expand. His limbs thickened even more, his claws elongating, and his back arched as his spine lengthened. His chest heaved as his fur rippled. His tail, now longer and bushier, knocked over instruments and beakers as it whipped wildly through the air.

The mixed serums were intensifying every part of his transformation. He wasn’t just a simple hybrid anymore; he was becoming something incredible. He could feel the power building inside him, but it wasn’t only strength. It was an all-consuming hunger that made his very bones ache with the need to reproduce. It rose from deep inside him like a wave, crashing over him like an uncontrollable force.

His stomach bulged further still, and this time, the feeling was euphoric. The litter that was growing within him was so much more than his first. The kits would be faster, stronger, and more powerful than before. His vision blurred with pain, and with an involuntary scream, he gave birth. Over a dozen kits fell from him in rapid succession, his body heaving as the newborn Vulpin emerged into the world one after another. Their fur was soft and their eyes were already beginning to open, even as they tumbled out of his body with each contraction. Hawke collapsed onto his knees as he expelled the final kit, panting heavily, his mind spinning.

His first litter of kits—the now fully grown beings that had once nursed at his side—sniffed the surrounding air. They sensed that the hunger inside him was still burning, mingling with the irresistible desire to procreate. Their eyes narrowed, and they quickly moved in to attend to their new siblings, delicately picking them up by the tuft of their necks away from danger. The transformation was far from over.

Hawke felt his body continue to stretch and expand, becoming more powerful. He could feel the next surge of life building inside him, pushing against his insides. His body was reaching new limits, his muscles surging, his bones cracking and reforming, growing stronger, more resilient. He could hear the blood pumping through his veins, his cock enlarging with every heartbeat as it rose past his navel. Another contraction, and then another—Another litter was being born, even larger than those before.

His kits watched him closely, their eyes tracking his every movement. They no longer needed him in the way they had when they were infants, but were entranced by his presence, his power. They understood their place in the growing pack, and perhaps it was that understanding that made them watch with patient, calculating gazes as their creator laboured. They once more retrieved their new siblings, gently cleaning them and holding them comfortably next to the previous litter, which was already growing rapidly.

Hawke’s lab, once a place of meticulous control, now felt small, suffocating. His massive frame barely fit inside it, and the walls of the sterile, cold space seemed to close in on him. He could feel the weight of his size, the strength of his newfound body—his bones were as tough as steel, his limbs long and powerful. And still he continued to grow.

Another surge in his stomach seemed to push every part of him outward with even more intensity. The third litter formed just as swiftly and with greater intensity. His muscles rippled, his cock lurched further, higher, nearly reaching his pecks as it became as thick as his forearm. The knot at its base expanded, and his vulva stretched ever wider in order to make way for the kits inside him. With a final, guttural cry, his stomach gave one decisive contraction as it expelled the entire contents of his womb at once.

As the final clutch of kits was born, Hawke felt a rush of primal energy unlike anything he had ever experienced. His body surged, growing ever larger, his head brushing up against the ceiling even while he remained on his knees. His vision, once blurry from the intense strain, cleared. It felt as though his eyes could perceive every detail, every movement in sharp focus.

The transformation was complete.

With a snarl that was part human, part animal, Hawke lunged forward. His claws raked against the walls, his immense strength tearing through metal and concrete with terrifying ease. With a roar that shook the foundations of the facility, Hawke broke through.

As he stepped out into the open, he took in the sights. The outside world was vast, the sky open and endless above him, filled with the brightness of the moon. The wind swept through his thick, russet fur as his hot breath condensed in the cold air, his enormous chest rising and falling. He was no longer a man. He was a force of nature.

As he surveyed the horizon, his mind whirred with the possibilities. The three litters of kits that had just been born from him were already growing quickly, already running and playing by his side, their eyes bright with curiosity. He was no longer bound by the limits of his once frail, human body. He was a new being—strong, powerful, primal, and free.

He raised his head to the sky and howled, and his pack joined in the chorus. Soon the world would be witness to a new era.

Dr. Arthur Hawke—if he could still be called that—had ceased to be the man who had dreamed of pushing the boundaries of science. His massive form, now standing nearly sixteen feet tall on his hind legs, was a sight to behold. Muscles rippling beneath thick fur, eyes glowing like molten amber, bristling with power. He was now a creature ruled by the most ancient, primal instincts, combined with the intellect of one of science’s most brilliant minds.

Hawke wasted no time running from the remains of his lab into the wilderness surrounding the compound. Though it was late in the evening, the sounds of the destruction of the lab had surely alerted the facility’s security forces. His offspring followed closely behind him, with those that were too young to keep pace clinging to his massive form, steadily maturing as they nursed. Once he was sure that they were safe, he brought his pack to a halt in order to plan the next course of action.

His kits, now all fully grown, played near his massive paws, their growls and yips an ever-present soundtrack to his thoughts. His desire to share what he had become, to spread the transformation that had changed his life to others, filled his mind. He needed others to experience what he now felt. He could not be the only one. He could not be alone in this power.

He looked down upon his children, seeing the growing hunger within their eyes, the same hunger that was once more building within himself. His tight belly—seemingly unaffected by his latest bout of pregnancies—yearned to be filled once more, overwhelmed by the raw need to birth more children. He noticed his eldest born standing among them, holding a leather bag in his teeth. “The serum,” Hawke thought, remembering his plan. He quickly scanned the horizon, spotting lights in the distance. It was a small town, still oblivious to what had transpired at the lab, filled with the perfect candidates for transformation.

It was time for the pack to grow.

As he stepped forward, his massive, muscular frame cast a long shadow over the ground. The night was silent, save for the rustling of the wind and the growls of his offspring. He lowered himself onto all fours and sprinted forward.

While the overwhelming instinct to expand the pack commanded him forward, Hawke was conscious enough to slow himself down so his children could keep pace as he propelled himself towards the town. They reached the town’s edge within minutes, but he knew he could go no further. His massive form would barely fit within the confines of the civilized world before him. It was time for his pack to take action.

The growls of his offspring echoed behind him, a chorus of monstrous creatures ready to spread their father’s gift. With a single low, rumbling growl from Hawke, he commanded them forward.

They slipped into the darkened streets, stalking in the shadows; Their amber eyes glowed in the moonlight as they sniffed the air, eager to find their target. He was swiftly located, a man who had stepped out of his home to take out the trash. He hesitated for a moment as he saw the strange, hulking shapes moving in the darkness. But before he could react, a massive fox-like creature lunged at him. His body crumpled beneath the weight of the creature’s assault, but before he could process what was happening, another member of the pack descended upon him, then another. Though he screamed and kicked, they were careful not to harm him; they restrained his movements before carrying him away.

As soon as they dropped the man onto the grass, he scrambled back onto his feet. The creatures surrounded him, blocking any attempts at escape. He then saw the mighty form of the pack’s patriarch emerge from the shadows, paralyzing him with fear. Hawke’s tail, a full bush of russet fur, swished with anticipation. He spoke with a deep growl that the man felt reverberate within his chest.

“What is your name?”

It took a moment for the man to process the words, shocked to learn that this creature could speak.

“My... my name is James,” he stammered, his voice trembling. His eyes locked onto Hawke’s glowing amber gaze, unable to look away as the sheer force of the creature’s presence held him captive. His heart hammered in his chest, both from fear and an inexplicable sense of awe.

He noticed one of the smaller creatures take a step forward, a bag dangling from its mouth. It gently placed it before its leader, who reached inside and pulled out a syringe. It looked comically small in his massive grip, but as he approached, James panicked. The pack held him down, as though they were following some silent command, leaving only his arm exposed as Hawke plunged the needle into his skin. Then the creatures dissipated, standing by. Before James could make sense of what had happened, a wave of heat coursed through his body.

“Welcome to the pack, James.”

James’ body convulsed, his muscles spasming as the serum coursed through his veins. He felt his body grow—slowly at first, but then with an unbearable intensity. His skin tingled, then burned, then stretched. Every nerve was alight with pain as his transformation began.

His arms swelled first. The muscles tightened, pushing outward, his skin stretching over his expanding biceps. He gritted his teeth as his chest followed suit, his pectoral muscles swelling, rising higher and fuller. His shirt ripped from the force of his growth, falling onto the ground in tatters.

His hands transformed next, his fingers elongating, growing larger. His nails shifted into thick, curved claws as pads formed in his palms. He staggered for a moment, his balance faltering as his body fought to adjust to its new weight and proportions. The muscles along his thighs grew larger and denser, reshaping themselves into the powerful muscles of a predator. His calves seemed to grow impossibly large, tearing away his jeans as they thickened.

He arched his back, his mouth opening in a silent scream, his spine cracking as it elongated. Thick fur sprouted all over his body, thickening and darkening as it filled his skin with warmth, its texture dense and soft against his growing muscles. A tail erupted from the base of his spine, growing long and bushy, whipping frantically through the air.

His breath came in short, jagged bursts as he leaned forward, the muscles in his thighs tensing to support his new bulk. The pain, the stretch of his muscles, the transformation itself, twisted his mind. At first, it was agony—a relentless surge of fire through his body. But with each passing second, the pain shifted, turning into something almost pleasurable. It was as though every inch of him was awakening to its true potential.

He felt his face changing next. His jaw widened, teeth elongating into sharp, gleaming fangs. His skin stretched as his face took on a more animalistic shape, forming a muzzle.

As the fur finished growing in and his body reached its new size, he felt the final changes. His heart beat faster as it pumped blood into his crotch. His tongue hung out the side of his mouth while he panted, his cock growing longer and thicker by the second. His abdomen thrummed as he felt his organs shift, a void expanding within him, demanding to be filled.

He let out a deep, guttural growl, a bestial noise that resonated through his chest. He was no longer the man he had been. The power was flooding him, filling him, and a primal hunger to breed rose within him, fierce and insatiable.

“He is one of us now,” Hawke rumbled, his voice thick with satisfaction.

Hawke felt a surge of desire build within him as he watched James’s transformation. His cock throbbed, steam rising from its head as it exposed itself to the cool night air. But he noticed competition nearby; His eyes flicked towards his offspring, panting and stirring, many of them bucking their hips involuntarily. The desire within them had also intensified at the sight of a potential mate; each one felt the urge to breed, to expand the pack. One of the more daring kits stepped forward, but Hawke halted them with a deep growl. As the alpha, he had sole claim on the pack’s first new addition.

James, meanwhile, took in the scent of the towering Vulpin before him. Hawke’s musk was exhilarating, melting away all other thoughts. He stepped forward, his cock twitching with desire. “Please...” James whimpered. “I need... I need you...”

Hawke stared into James’ dazzling blue eyes, deep as the ocean, reflecting his gaze. His limbs trembled as he stepped closer, the adrenaline surging through him. Hawke’s breath grew heavy and laboured as the primal need to breed coursed through him, but he restrained his desire to pounce. Though James’s once frail body had grown larger and stronger, Hawke still towered over him. It wouldn’t do either of them any good if Hawke ended up crushing him. He slowly came down onto all fours, stepping slowly towards James, cock at the ready.

The surrounding air grew thick with anticipation as James lay down in the bare grass, spreading his legs. Hawke nodded, then pressed the tip of his cock into James’ newly formed vulva. It was already slick with desire, James moaning and begging. He reached for Hawke’s chest, pulling at his fur with clawed fingers, urging him forward. Hawke allowed his mate to set the pace, carefully thrusting as they worked his cock in and out, a little deeper each time.

Hawke could feel the walls of James’ vagina throb rhythmically, applying a pleasurable pressure to his cock. The world around them disappeared as they continued to thrust, faster and faster, juices flowing freely as they both became entrapped in their passion. Seeing his mate already lost in his newfound desires, it was getting harder for Hawke to focus. But he did not want to risk damaging any part of James before he could bear their offspring. As he felt the inevitable orgasm approaching, he clenched his teeth, digging his claws deep into the earth. Then suddenly, Hawke’s body convulsed as his cock lunged forward, his knot pushing deep into James.

With a mighty roar, Hawke threw his head back, a sound that rattled the windows of the nearby buildings. His cum quickly filled James to the brim as they both simultaneously reached orgasm. They remained firmly locked together for a few minutes, torrents of cum pumping into James’s womb, causing a slight bulge in his abdomen. Once he finally finished, Hawke backed away, slowly pulling out his three feet of throbbing cock from deep within his mate before pressing a firm paw over his opening. He wanted to ensure not a single drop of his seed spilled out. James, meanwhile, remained lying in the grass in a state of bliss, his primal urges satisfied. He gently caressed Hawke’s muscular arms, silently thanking him for the experience.

But just as their breathing slowed, the power of creation surged through James. His body tensed as his belly swelled. He grasped at his stomach, alarmed by the sudden change. Hawke’s children moved in to support him, allowing James to grasp their fur to ease the pain. The sight of the rapid growth invigorated Hawke. Every shift of James’s body hailed the arrival of more life. But there was also something growing in Hawke.

Satisfying the primal urge to reproduce, to continue the cycle of life he had unleashed, fuelled him. Hawke could feel it, an almost overwhelming power building deep within him. His body pulsed with energy, his fur standing on end while his tail whipped through the air.

James’ swollen belly writhed, stretching his skin near its limit. The kits inside him stirred more violently now, a sign that the pregnancy had reached its peak. He reeled as the first contraction hit.

The first of the kits emerged, a massive, powerful creature with the same glowing amber eyes as Hawke, its body already beginning to grow larger. More followed, each one stronger than the last. Hawke’s senses flared at the sight of his progeny entering the world. And then,his body grew.

The more James gave birth, the more Hawke’s form swelled. His muscles grew thicker, his fur denser. His already colossal body felt as though it were tearing at the seams, expanding with every new addition to his pack. He let out a low, guttural growl as his body quivered. The transformation was nearing its peak, synchronized with James’s labour.

With one final, agonizing cry of pain and release, James pushed the last of their kits into the world. His body, bloated and spent, trembled, but his wild eyes focused on Hawke. The pack’s leader had grown several feet in height, standing twenty feet tall from toe to ear tip. His muscles had grown denser, his fangs longer, his claws sharper.

Similarly, James had also grown in strength. His pregnancy had thickened his fur, sharpened his senses. His muscles bulged with newfound might and his stature had grown by several feet. With trembling legs, he stood. He looked up at Hawke, his blue eyes glistened with a combination of fear and awe, awaiting his command.

Hawke reached for the bag, filled with the serum he had created. He then held it out for James to take.

“Go,” he uttered in his deep, primal voice. “Spread our legacy.”

Hawke’s eyes scanned the area, his nostrils flaring as he carefully walked the streets of the town he and his pack had descended upon.

James, the first other human Hawke had injected with the serum, went on to inject others. The transformation spread quickly, with each new member tasked with doing the same as they quickly overtook the town. Hawke’s offspring broke off into groups, each claiming the new members as their mates and propagating, the pack growing exponentially. By the time the first light of dawn crept over the horizon, the town was no more, replaced by an army of beasts that now answered to Hawke.

As he watched his pack’s progress, the remains of Hawke’s scientific mind took a great interest in how copulation lead to growth. While the specifics weren’t clear to him, he made note of a few points: When two Vulpins produced offspring, the smaller of the two would grow substantially in size and power. It could vary for the larger one, but usually they experienced much less growth.

Hawke himself had grown since their arrival, mating with those who had grown large enough to endure it. But he soon realized that some Vulpins’ growth would eventually plateau, gaining very little in height regardless of the size of their partner. To Hawke’s chagrin he quickly outpaced the other Vulpins in size, and at his current height of 25 feet there seemed to be none left who could breed with him. They were too small to inseminate him, or too weak to be on the receiving end of his cock.

In his current state, there was a real risk that he could kill them with his overwhelming strength and size. Hawke had witnessed such fatal couplings among less restrained members of his pack, a tragic outcome that he wanted to avoid. But it caused him to grow restless. His primal drive, the insatiable hunger to breed, demanded he find someone. His eyes gleamed with a feral light as he surveyed the streets, hoping to find one that could satisfy him.

Then a scent caught his attention. Sharp, pungent, irresistible.

The animal inside him—the part of him that had stripped away his human nature—pushed him towards the scent with a force so overwhelming that his legs moved before he even realized it. His stomps rattled the streets as he followed it towards its source. He felt the urge inside of him growing, his womb wanting to host the seed of this potential mate. As he rounded the final corner, he saw him.

Though still dwarfed by Hawke’s height, the power of this Vulpin was unmistakable. Surrounded by several Vulpins who begged for his seed, the tall grey beast possessed broad shoulders that were laden with fur. His arms were thick, his thighs possessing the taut, sinewy strength of a predator, displaying the kind of muscle density that could allow him to leap from one surface to another with precision.

He was about as tall as Hawke had been when he first arrived at the town, and it was clear he too had grown frustrated at the lack of mates. He pushed aside those that had gathered below, uninterested in their advances. But as he sensed Hawke’s approach, he turned to meet his gaze. His eyes flared with excitement. They instantly knew they were meant to come together.

“I am Kain,” said the beast with a low rumble.

The resonance of his voice immediately caused Hawke to become erect. Hawke stood silent, his chest heaving as his urge to procreate with such a strong specimen increased by the second. It took all of his will to stop himself from leaping onto Kain, from pinning to the ground and fucking him with untamed fury. Kain slowly walked towards him, his cock hardening in turn as he spoke once more.

“I know who you are. You’re the Alpha.”

Understanding that Hawke’s continued silence was an invitation to approach, Kain reached for Hawke’s impressive frame. He started by massaging Hawke’s chest and arms, feeling each rippling muscle beneath his paws. He worked his way down, feeling the smooth fur over Hawke’s tight abs, before grabbing hold of Hawke’s engorged member. Hawke moaned contently, and so Kain gently stroked it, lubricating it with his tongue. Hawke’s fur bristled with anticipation, wanting nothing more than to fill the beast before him with his seed. Kain then slowly pulled his new lover closer, tugging at his arms, inviting him to lie down on top of him. But Hawke shook his head.

“No. You are not ready.”

Kain’s expression shifted from confusion to fury. How could this magnificent beast tease him with false promises? But before he could snarl in outrage, Hawke spoke.

“You must grow first, through me. Come.”

Kain understood now what Hawke asked of him. Coupling with such a larger Vulpin would propel him to a greater size; By first penetrating Hawke, he could then become strong enough to receive his cock. He waited as Hawke lowered himself as close to the ground as possible. His vulva was dripping with slick lubrication, urging Kain forward. Their union was quick; The prospect of carrying Hawke’s litter excited Kain greatly, and he would do anything to achieve more growth. It didn’t take long for Kain to cum.

Hawke was irritated by his partner’s lack of care, not having the chance to reach orgasm himself. But it was not long before he felt the familiar pressure within him. His stomach swelled, the unmistakable feeling of pregnancy beginning to stretch his body. After having to endure the urge to reproduce for so long, the growth inside his abdomen had become an almost comforting pressure. Hawke moaned, both from pain and pleasure, as his skin stretched and his organs shifted. The definition of his abs became more pronounced as they expanded around the swelling mass, unable to hold back the growing weight inside. The pressure mounted as the litter within him grew quickly, moving and shifting beneath his skin. His heart raced as he felt the sensation of multiple lives growing and shifting inside, rapidly advancing towards birth.

The pressure intensified, and the sharp pangs of labour began. One contraction, then another. Each one coming faster, until the kit pushed out of him. No sooner than they had slid onto the pavement below, they began to grow and mature at a rapid rate.

Kain’s body was changing too—his muscles grew and his frame expanded as a rush of power surged through him every time another kit was born. Hawke felt the same surge, digging deep trenches into the pavement as his claws extended further, invigorated by the power of creation. His increasing weight caused the ground below to crack, his chest expanding more with every breath. With one final contraction, the last of his and Kain’s offspring was birthed.

Both of them fought to catch their breath after the exhilaration of their coupling. While Hawke’s growth ended after a few feet of added height, it was nothing compared to the amount that Kain was gaining.

Kain felt each stretch of muscle, each shift of his skeleton, every cell in his body expanding, inflating with an energy greater than he had ever experienced. He staggered to his feet, his newly sized body awkward and disoriented. His senses had sharpened—he could hear every heartbeat, every breath, every rustle of the surrounding air. The world was a blur of sound, smell, and light.

Kain wanted to run, to feel the wind against his fur, to embrace his new power, but he couldn’t ignore the growing hunger inside him. He needed to grow more. Bigger. Stronger.

As Hawke rested, Kain was quick to move in to keep his mate aroused. He licked and cleaned Hawke’s crotch, slathering them with his saliva to keep them lubricated. Hawke’s cock had grown in girth and length, but Kaine could now comfortably fit its head into his mouth.

Hawke moaned with pleasure, feeling his cock throb with a quickening pace. Though his urge to produce more young was satiated for the moment, seeing Kain stirred into a frenzy amused him. He was eager to tease his new toy.

Kain climbed atop of Hawke’s chest, his new height allowing him to maintain eye contact as he positioned his hole above the Alpha’s cock. But before Kain could slide down the pole, Hawke lifted him higher. He kissed Kain passionately, rousing him even more. Kain panted and drooled, the urge welling inside of him with such ferocity he could hardly endure it. He began to lick and suck on Hawke’s nipples, greedily feeding on fresh milk. Deciding that it was time to end his mate’s suffering, Hawke called upon the urge to reproduce from deep inside of him, bringing it back to the surface.

Slowly, his instincts flared from a spark to a raging fire, the heat of his body rising by the second. Hawke slid Kain onto his cock, lowering him slowly before beginning to thrust. He nuzzled Hawke with joy, feeling the repeated pounding in his womb. Hawke maintained his grip around his hips with one hand, stroking Kain’s cock with the other. Kain shivered and reeled his head back, brought to the brink of orgasm as Hawke deliberately slowed down, keeping him on the edge.

“Not yet,” said Hawke. “Not until I’m finished.”

Kain whimpered, forced to follow the will of his superior. His cock was leaking precum all over Hawke’s abs, throbbing painfully from being kept on the edge for what felt like an eternity. Hawke continued the rhythm of his thrusts as he felt himself flex harder, the tightness around his cock increasing. Kain was moaning loudly, and Hawke knew that the power he would receive would be incredible. He would feel it build inside of him, grow until it reached his limit, and then propel him as he witnessed the birth of his strongest offspring yet.

Finally, it came. A flood of cum filled Kain as Hawke pushed deep into his abdomen, roaring with power. Gallon after gallon distended his stomach, a preview of his soon to be coming pregnancy. Kain covered Hawke’s stomach with cum in turn, digging his claws deep into his flesh as he was overcome with ecstasy. Hawke did not even notice the pain through his climax.

Kain slumped over onto his mate, totally spent. Hawke worked to catch his breath, pulling out his cock slowly. He knew that they had created something powerful just now, something great. He felt the thrum of power building between them, the air positively electric. Before Kain even had the time to recuperate, he felt the first pangs of growth deep within his womb.

They watched as Kain’s stomach grew, swelling with unprecedented speed. He clutched at his belly, the pain growing just as quickly. The feeling of Kain’s stomach pressing against his own thrilled Hawke. He knew that impregnation would be an increasingly rare opportunity as his power grew, so he savoured the moment. He reached out with his paw, gently rubbing Kain’s stomach, feeling the skin beneath his fingers stretch taught.

Kain’s breath came in ragged bursts as he felt the offspring within him develop faster and faster. He groaned and writhed as his stomach swelled to an enormous size, skin stretched tight as his kits pushed against his body. He roared and squirmed, his stomach growing so large that it looked like it might rupture.

Hawke gently lowered Kain onto the cracked concrete beside them, the intense pressure building with each passing second. Kain’s muscles flexed, his spine arching as the burden of carrying life reached its peak. Soon the sharp pangs of labor began, and Kain could feel the kits moving within him, pushing their way into the world, ready to join the legacy of their fathers. His body was undergoing another growth as his body stretched even further, his limbs thickening with every newborn that was brought into the world.

Hawke could barely keep up with the surge of power within him. His body, driven by instinct, pushed forward. With each kit he was becoming bigger, stronger than any Vulpin could ever dream. He felt the lampposts bend under his weight, the earth tremble beneath his claws.

Just as his labour ended, Kain groaned a low, animalistic sound. The overwhelming sensation of gestation hit him with renewed intensity. He felt them—more kits—pushing against the walls of his insides as a second litter immediately formed within him. His body was working faster, harder. He could feel them inside him, pressing on his ribs, his organs, leaving little space for him to breathe.

Hawke was overtaken with excitement. Not since his ascension had any witnessed multiple pregnancies in a row. This new generation would propel their species to new heights. They would become earth’s apex predator, supplanting humanity in every way. The very thought thrilled Hawke beyond reason.

Despite Kain having grown from the first batch, the labour did not get any easier. The pressure was far greater than before, and the kits within him felt as if they were multiplying by the second. His belly swelled rapidly, so much so that the weight of it forced him to pull back, struggling to breathe under its burden. With a quick succession of contractions their offspring emerged nearly fully formed, towering over other Vulpins.

Hawke’s own growth exploded. His limbs cracked as they stretched farther, his body swelling with terrifying power. His tail whipped through the air, smashing into the side of buildings, sending broken glass down to the streets below. The landscape bent beneath him, the world shrinking as he grew. His cock lurched in size, striking against his broadening chest with a wet slap that echoed down the streets.

He roared—a low, guttural sound that reverberated through the air—and the world responded. Buildings shook, car alarms resounded for miles. Streets buckled and collapsed as his body surged upward, unstoppable and wild. He had swelled with strength, becoming a true titan of creation. He looked down at his mate. Kain had increased in power, looking to have grown as tall as Hawke was prior to their coupling. But somehow, despite having made union with one weaker than himself, Hawke had grown substantially in size. He stood on his hind legs, now 38 feet tall, a truly incontestable Alpha.

The air hummed with the energy of their transformations. He was now driven by an insatiable need to dominate his environment. The need to propagate his kind across every continent, overtaking all of humanity.

He looked beyond the buildings of the town, his gaze falling onto the city in the distance, a much larger prize.

“We take the city next,” Hawke growled, his voice carrying over the growing sounds of the gathering pack.

They responded in kind, their howls filling the air.

The pack, now over a thousand strong, had moved on from the small town they had conquered towards a larger prize. Sirens wailed throughout the city, alerted to the approach of Hawke and his prodigies by the military. But the humans could not prepare for the sheer number of Vulpins coming their way.

The pack arrived like a wave crashing against the shore, tearing through the perimeter defences. City police attempted to fight back, but their bullets bounced off the hides of the larger beasts. The smaller ones attacked with deadly precision, dragging the officers into the streets to be devoured, serving as sustenance to the ever-growing pack.

Yet despite this overwhelming strength, the human resistance was not completely helpless. The military soon arrived, unleashing their more advanced arsenal against Hawke and his pack. Artillery fire tore through the streets as helicopters circled overhead, but the will of the pack proved greater; Every explosion, every missile, only seemed to energize the creatures further.

Hawke’s body had long since stopped being able to fit inside the confines of normal structures, but he did not need to take cover. The bullets, no matter how high-calibre, simply bounced off his thick fur, and he baited missiles into hitting the military’s own forces. He climbed the faces of skyscrapers with ease, lunging through the air with unmatched speed as he knocked the military crafts out of the sky. But as the battle raged throughout the city, one of his own offspring acted strangely.

His firstborn Fenrir, once loyal to Hawke, watched him closely. He had grown to a monstrous size, as many of his siblings had, but there was a different hunger in Fenrir—a desire for leadership, for power, for dominance.

Hawke ignored the signs at first. After all, Fenrir was his own flesh and blood, his creation, and like the others, he should respect his authority without question. But the creature’s eyes never left him, watching as Hawke fought against humanity’s forces. Fenrir’s movements became more deliberate, more calculated, as if waiting for something.

The ground shook from the shock waves of explosions. Another helicopter fell down in flames, crashing into an overturned tank. Soldiers retreated, dragging their injured through the wreckage. Hawke stood at the centre of the battlefield, his massive frame commanding the pack’s attention. He was nearly forty feet tall, his chest broader than a car, his claws like daggers, his muscles rippling with raw power. He raised his head towards the heavens and roared, declaring victory over the humans. But then, a deep, resonating growl made all those who heard it turn in unison towards the source.

As the pack finally conquered the city, Fenrir seized the opportunity.

Dr. Hawke’s instincts flared immediately as he turned to face the challenger. Fenrir’s massive tail whipped behind him as he charged forward, the weight of his enormous form bearing down on the ground like a war machine. The two monsters collided with a thunderous boom, Hawke grappling with his son as the latter gnashed his sharp teeth inches away from his father’s throat. Hawke felt his son’s strength, the force of his muscles, pushing back against him with an energy he had not expected. Fenrir wanted to take his place as Alpha.

The realization left him stunned. This was the first time that any Vulpin had dared to challenge him.

With a snarl, Hawke pushed back, shoving Fenrir away with a force that sent him crashing into a nearby building. Fenrir quickly recovered, his amber eyes blazing with defiance. While Hawke eclipsed his offspring in terms of raw power, his son had allowed Hawke to tire himself against the humans in order to even the odds. Fenrir lunged again, and this time, he sank his teeth into Hawke’s thick hide. The pain was sharp, but it wasn’t enough to break him. Hawke slammed the challenger to the ground, his enormous weight pinning the creature beneath him.

“You think you can take my place?” Hawke growled.

His offspring didn’t answer with words, but with action. It raked its claws deep into the older beast’s side. With a roar, Hawke twisted, losing his grip on the challenger. As their battle continued, Hawke realized his son was everything that he had aspired to create. He was cunning, agile, and strong, with an unrelenting drive to rise above; A perfect blend of man and beast. For the first time since his transformation, Hawke questioned his own superiority.

Fenrir lunged once more, aiming for Hawke’s throat. He held his firstborn back with all his might, but the challenger had one final trick. With a forceful twist, it broke free from his grasp and slammed Hawke into the ground with a violent crash. The impact shook the earth, and before Hawke could recover, Fenrir pounced.

The moment his son bit down into the back of his neck, Hawke felt a shift in the air. The pack watched as Hawke’s body, once the embodiment of unstoppable power, now lay shattered and broken. They began to doubt his position as leader. Hawke grasped at his neck in order to slow the bleeding, and as he tried to crawl away, Fenrir stomped down onto his back, pinning him to the ground.

Fenrir had proved himself the victor.

But before the challenger could finish him off, the sounds of gunfire returned. A group of soldiers attempted to catch the Vulpins off-guard. Fenrir grinned, and with a powerful howl the pack followed its new Alpha in the charge, leaving Hawke behind.

Hawke stumbled onto his feet, racked with pain. His blood boiled with rage and shame as he fled from the city, escaping into the wilderness.

“I will be Alpha again,” he growled. He would not let his own flesh and blood claim dominion over the pack so easily. He would have his revenge.

In the weeks that followed, Hawke watched the pack from afar as they moved from city to city, their numbers increasing with each conquest. His recovery was slow, but once his instinctual urges overtook the pain of his healing body, he became restless.

The primal urge to reproduce still burned within him, gnawing at him constantly. He would call into the night, howling for a mate to join him, but none dared wander away from the pack. He had been abandoned, his own creations now listening only to their new Alpha.

He often masturbated in order to quench the fires, but the relief was temporary and unsatisfying. The frustration built within Hawke as he craved the feeling of his abdomen expanding, the feeling of a litter growing within another and emerging into the world. He needed to form a new pack, one that would follow him without question. But how?

The Vulpin serum he had created was all spent, and he had no access to his old lab in order to make more. He racked his brain for a solution, but with each day that passed, he fell deeper into depression. He stopped grooming himself, stopped eating. He even stopped caring that he was being followed.

A platoon of soldiers had been hunting Hawke for days, a specialized force sent to deal with him now that he was alone. But it mattered little to him; short of hitting him with a nuclear bomb, most weapons were incapable of piercing his hide, and he never kept far enough away from human settlements to justify such a drastic measure. If anything, their presence was a welcomed distraction.

It was late in the afternoon when the platoon came close enough for him to overhear their conversations. They underestimated the sharpness of his senses, believing that his size kept them out of earshot. He sat in the clearing of a small forest, listening as the team moved through the dense foliage and whispered to one another.

“Move out! Form a perimeter!” their sergeant barked, trying to mask the anxiety in her voice. Her squadron, numbering a few dozen, seemed well-trained from the way they responded instantly to her commands. It made Hawke reminisce about the days the pack followed his every whim. Hawke mindlessly fondled his balls as the desire to reproduce flared up.

He heard the soldiers express their disgust at his display. He found satisfaction in having an audience, a smirk curling on his lip as he pleasured himself, stroking his lengthening cock. He listened as they tried to continue their discussions about potential weak points, distracted by his massive girth. They discussed shooting him right in the crotch, and Hawke wondered if the pressure from whatever bomb they had prepared might stimulate him further. He positioned himself, aiming his cock towards the platoon leader, preparing to fire a little artillery of his own.

Seeing him shift, the platoon spoke over their radios with increased urgency. Hawke had to hold back his laughter, doing his best to not let on that he was perfectly aware of their plans. His breathing sped up, his hips bucking as he felt the approach of orgasm.

But just as he shot a rope of semen out towards the treeline, he heard a thunderous boom behind him.

There was a loud whistle, then a bang. The impact caused Hawke to roar out in agony as he clenched his shoulder, blood pouring out of a large wound. The humans must have developed some sort of new armour piercing explosive. He snarled with rage; the time for games was over.

Before they could fire a second round, Hawke charged with the force of a hurricane. His roar split the air, causing the earth to tremble beneath the soldiers’ feet. They fired in unison, their missiles shrieking through the air, but Hawke dodged them all. He retaliated with terrifying precision, his claws sweeping through the trees, shredding wood just as easily as the soldiers’ flesh.

Their Sergeant ordered for retreat, but Hawke no longer felt indifferent to their existence. His speed was unmatched, his size almost too much to comprehend. And his presence was enough to make even the bravest soldiers run in fear.

As he had nearly finished dispatching them, something caught his attention. His whiskers twitched as he sensed something nearby. Someone like him. But that was impossible: no Vulpin could have gotten this close without him noticing.

There was shouting among the trees, along with desperate calls. “What’s happening?!” a soldier shouted.

Hawke focused his attention on the soldier. A large glob of semen had struck Corporal Eric Vasquez directly in the chest, seeping through his clothes and into his skin. His arms bulked up, muscles growing, bulging under his fatigues as his uniform strained to contain them. His legs grew thicker, his posture more hunched and powerful. He grunted in pain as his bones and joints creaked, his body expanding.

“Sergeant... H-help me...!”

But he was not the only one transforming. Sergeant Rachel Caldwell was covered in Hawke’s cum, her clothes ripping from her expanding form. She fell to her knees, her breath coming in heavy, laboured gasps. “Run... I can’t... Stop,” she begged, her voice deepening. Her eyes shifted—the whites of her eyes disappeared, replaced by a sharp amber hue, glowing faintly in the dim light.

A fellow soldier stood frozen, horror-stricken, unable to comprehend what he was witnessing. He backed away slowly, but Eric—no longer truly human—growled in response. His body continued to transform, fur sprouting in patches across his now-hulking form. The rippling muscles of his chest and arms shredded away his clothing, and his fingers elongated into claws.

The soldier, his heart pounding in his chest, took several steps back, instinctively raising his rifle. But before he could fire, Hawke pierced through the canopy with blinding speed, instantly obliterating him. Hawke then carefully moved aside, wanting to observe what was unfolding below.

Rachel’s teeth grew longer, sharper, as her face elongated into a muzzle. She moaned, her voice deepening into a primal growl as her clit throbbed to the rhythm of her rising heartbeat. With each pulse, it lengthened, pushing out the front of her pants until the seams snapped. The head of her newly formed cock burst out, stretching up past her toned abs.

Eric’s transformation was similarly nearing its completion, and the change was nothing short of overwhelming. He felt powerful, fast, and nearly invincible. Rachel’s sharp fox ears twitched with every sound, picking up on every movement, every heartbeat of the Vulpins around her. But beneath the sharp awareness was a mounting, almost irresistible urge, one that filled their bodies with a craving they had never known before. They felt the hot flush of something deeper than hunger—an overwhelming compulsion to reproduce, to claim what was theirs, to fulfill the genetic drive that was now an undeniable part of their existence.

As the last remnants of their humanity faded, Sergeant Rachel Caldwell and Corporal Eric Vasquez struggled to maintain control over their newly transformed bodies. The overwhelming flood of instincts surged through them, drowning their once sharp military training. The surrounding air thickened with the scent of pheromones, filling every breath they took with an intoxicating scent. The Vulpin transformation had awakened a deep, animalistic attraction they couldn’t ignore.

Rachel looked at Eric, her mind confused by the newness of it all. Yet there was something in his gaze that pulled her toward him. Eric’s body also burned with the need to mate, to fulfill the transformation that had claimed them both. His abdomen felt tight, constricted, and full of a strange, potent energy. The more they resisted, the stronger the pull became. The two Vulpins circled each other, their gazes locked onto the other. Then, with a sudden surge of energy, Eric lunged.

But Rachel, with a fluidity that belied her size, spun to the side and caught Eric in mid-air, slamming him onto the ground. Hawke’s eyes widened as he briefly feared the two Vulpins would destroy one another, but there was something more to their movements—something that spoke to the very core of the Vulpin nature.

The two Vulpins were locked in an increasingly violent but strangely intimate struggle. Their claws dug into each other as they rolled and tumbled. Rachel’s eyes never left Eric’s, as if daring him to try and top her. They fought to see who would be the one to inseminate the other. The sheer physicality of the contest violently shook the ground beneath them until finally Eric pinned the woman who was once his superior.

Eric’s tailed swished with excitement as he briefly savoured his victory. He then positioned himself, forcing Rachel’s legs apart with his own. She offered only playful resistance, giving gentle bites to Eric’s neck and shoulders. Finally, his cock slipped into her welcoming vulva, and their mating began.

They thrusted in unison, their coupling a perfectly synchronized dance. They read each other’s desires through pure instinct. Rachel’s newly formed cock poured ample amounts of pre onto their bodies, enabling them to slide in and out effortlessly. Then, with a thunderous roar, the process was complete.

They remained locked together for some time as Eric pumped load after load into Rachel. Finally things simmered down, both Vulpins panting with satisfaction. They cuddled briefly until a pressure began to form between them. Rachel’s hands rested on her stomach, which was swelling. The rapid change caught her by surprise, her once flat abdomen now ballooning with the unmistakable signs of pregnancy. Her breath quickened as she felt the strange weight inside her, her body becoming a vessel for life.

Eric watched in awe as Rachel’s belly expanded at an alarming rate, the pressure inside her growing stronger.

“It’s… happening,” she whispered, but her voice sounded foreign to her own ears, gruff and animalistic.

Her abdomen continued to balloon rapidly, larger than it had any right to be for a normal pregnancy. Every shift of her body filled her with a visceral need to complete the process, to bear the offspring that were now undeniably a part of her.

Her thoughts were fading into a haze of instinct. She could hear Eric’s breathing grow heavier beside her, and she could feel the intense bond forming between them. They were no longer human—they were something more, something driven by forces far beyond their comprehension. As Rachel’s body swelled to its maximum capacity, her breathing became ragged and uneven, her fox-like features contorting in a combination of agony and ecstasy. Rachel let out a cry as her swollen belly trembled.

With a powerful contraction, her body pushed. Her eyes narrowed with intensity, and her breath came in ragged gasps as the kits emerged. They were small, each with the distinct features of both fox and human: clawed hands, sharp fox-like faces, and eyes that gleamed with wild intelligence. Her body surged with power, and she could feel herself growing stronger, more powerful with every birth.

Her body expanded again, the muscles across her chest tightening, her fur bristling. Her limbs lengthened, becoming more powerful, more massive than before. The ache in her stomach intensified, another contraction surging through her.

Eric watched her transformation with awe, his amber eyes glowing brighter. As Rachel transformed further with each birth, he similarly grew taller and broader, his form becoming more muscular with every breath he took. He crouched at Rachel’s side, as if guarding her, waiting with silent patience as she struggled to manage the overwhelming sensation of new life emerging from her.

Rachel let out a deep, guttural growl, her muscles stretching as they expanded. She became more powerful than any soldier, a creature of pure instinct—a mother, a protector, and an unstoppable force. Finally, as the last of the litter emerged, thirteen kits in total, both her and Eric’s growth came to an end.

With the forest filled with the sounds of life, Hawke felt renewed determination. He had lost all hope of reclaiming his position as alpha, but with the ability to transform humans with his seed, he did not need to reclaim his old pack. He would form a new pack, bigger and stronger than ever before. And as the members of his pack bred and grew, it would only be a matter of time before he, too, would carry a litter of his own.

Hawke helped his new pack members to their feet, allowing them to cling to his form in order to move them to a more secure location. He was already plotting his next move, calculating which human settlement to conquer next. In an effort to destroy Hawke, the army had unknowingly awakened an even more powerful force, one that would reshape the world.

Deep within an underground complex, a team of scientists toiled, analyzing every aspect of the Vulpin threat that was ravaging the country. Entire cities had fallen, with thousands of people displaced or killed. Squads of soldiers were sent out only to return broken and disheartened, with few survivors left to speak of the horrors they’d witnessed. But a recent discovery had opened an opportunity for humanity.

Combing tirelessly through the rubble of the lab where the Vulpin serum had been developed, scientists discovered a contingency designed by Dr. Hawke himself: an antidote. It was a chance to reverse the genetic alterations within the hybrids, returning them to their human selves.

Among the scientist was Dr. Elliot Moore, an unassuming though respected geneticist. Elliot and his colleagues quickly experimented with the antidote by exposing it to any samples they could collect from the Vulpins, but the results were mixed. Sometimes the antidote totally purged all traces of fox DNA, but just as often it would have no effect whatsoever.

One day, a batch of samples from Hawke himself arrived, a bittersweet prize collected during a failed attempt to eliminate him. The samples included fur, blood, and semen.

They handled the samples with care, knowing full well that this could be the key to eradicating the Vulpin threat. As the progenitor of the species, Dr. Hawke’s DNA coursed through the veins of all other Vulpins; Surely if they could reverse the transformation in these samples, they could find a cure for them all.

But as Dr. Elliot poured over the latest data, a small sample of the semen sitting on the counter next to him, a drop fell unnoticed from the vial. And as Elliot reached across the counter to grab a nearby notebook, his hand brushed against the drop. He wiped it away without a second thought, unaware of its potency as it penetrated his skin and seeped into his bloodstream.

It was a seemingly tiny mistake which would drastically affect the war.

Elliot went home that night, feeling a dull ache in his limbs. His husband, David, was in the kitchen, preparing dinner. His presence brought a rare comfort, and as much as the weight of the day’s failures pressed on him, Elliot couldn’t help but smile when David greeted him.

“How’s the lab?” David asked, leaning against the counter.

“It’s... complicated,” Elliot replied, slipping off his coat and hanging it up. He moved to the sink to wash his hands. “We’re still no closer to a solution.”

David studied him for a moment, but didn’t press the subject. Instead, he reached for a bottle of wine, uncorking it and pouring them both a glass.

“You’re working too hard, you know,” he said softly. “You need a break. We both do. We haven’t had a night off in months.”

Elliot took the wine with a sigh. “I know, but I can’t stop now. People’s lives are at stake, David. Humanity’s at stake.”

David nodded, his expression softening. “I understand. But you can’t save the world if you’re burning yourself out. Come on, I’ve made your favorite.”

Elliot smiled faintly at him. “You know just how to make me feel better.”

They had dinner together, and for the first time in weeks, Elliot relaxed. He had usually felt exhausted, consumed by his work, but tonight, something was different. He felt more... alive.

David noticed it almost immediately. Elliot was more affectionate than usual, brushing against him when they sat on the couch, holding his hand. Elliot looked at him in a way he hadn’t in a long time.

“You’re awfully cuddly,” David remarked, his voice light.

Elliot smiled, pressing closer to him. “I guess I just missed you.”

Soon after, they made their way to the bedroom. They had always maintained a healthy sex life throughout their marriage, but Elliot could feel that there was something different about tonight. Maybe it was the way David smiled, or the way he smelled, but Elliot never felt more attracted to him than in that moment. He was craving him in a way that he couldn’t describe.

As they undressed, Elliot felt more energized than ever before. There was little need for foreplay; the moment they reached the bed, he was all over David, kissing him all along his neck and body. David was the one to ask him to slow down so that he could lube up. Elliot acquiesced, watching with envy as David prepared his cock.

As soon as David gave the go ahead, Elliot resumed covering him in affection. He nibbled and nuzzled at his husband’s body. He ran his fingers over his torso, feeling the definition of his pecks and abs. But as David prepared to get into position, Elliot made an unusual request.

“I’ll be on top this time,” He told David in an almost commanding tone. David was surprised, but answered with a smile.

“You’re full of surprises tonight.”

As they shifted positions, Elliot wasted no time penetrating David’s ass. His endurance was incredible, stronger, faster than he had ever been before. There was something in the way he looked at David, something that spoke of need, of hunger. But David didn’t question it, caught up in the most passionate sex of his life.

The next morning, Elliot noticed something strange in the mirror. Beneath the fabric of his underwear, he saw a larger than usual bulge. Reaching down, he shivered as he touched his dick. It was much more sensitive than usual. He pulled the fabric down and froze.

He leaned in closer to get a better look. It looked as if his dick had... Grown, though he couldn’t be one hundred percent certain. He chalked it up to last night’s sex. He had never really been much of a top before, but for some reason, he had the urge to dominate David. He must have been a little rougher than he realized. He waved it off as some mild swelling, deciding that he would ask David to check it out after work.

But as the day went on, Elliot felt more and more bothered. Whenever he shifted his position, the fabric of his clothing would rub against his cock and make him chub up. It would take much longer than usual for his erection to go away, which then immediately returned with a small shift of his legs. He continued to brush it off, thinking he must have been developing an infection of some kind.

As Elliot stood in the lab, staring into space, a voice startled him. “Dr. Moore,” called out Dr. Samuel Harris, the youngest member of the team.

“Yes?” he replied.

“Come look at this.”

Elliot made his way towards Dr. Harris. He was standing in front of a large glass tank filled with rats. The rodents writhed in pain, their bodies swelling and contorting.

“I’ve been testing ways to induce the Vulpin transformation,” Samuel said, excitement in his voice. “Look at their development. I think I’ve discovered something big here.” Elliot peered into the tank. The rats had become agitated, their tiny, fur-covered bodies now growing in size, their features elongating into something more vulpine. The transformation was unfolding before his eyes, but something felt off.

The sensation was undeniable, evident by the increasing pressure in his groin. As he watched the transformed rats mount one another, he felt heat rapidly spread throughout his body. The sight of them mating, of their loss of control over their reproductive urges. He found it... arousing.

Samuel’s voice felt distant, Elliot barely able to focus on his words. “I’ve never seen anything like this. It must be connected to Dr. Hawke’s original formula somehow.”

Elliot rushed off to the bathroom, stammering an excuse as he stepped away from the tank. He tried to steady his heartbeat as he walked, his hands in his pockets in order to keep his throbbing erection from showing. Finally, as he made his way into a vacant stall, he pulled down his pants and gasped.

His dick was growing. Slowly, steadily, it was elongating with every second he spent sitting there in disbelief. It pushed out with each beat of his heart, absorbing more and more blood. He clutched the sides of the stall, moaning involuntarily from the sensation of growth. After what felt like an eternity of trying to stifle the noises coming from his mouth, his cock finally stopped around seven and a half inches.

Elliot’s mind was spinning as he tried to reason an explanation for what he had just witnessed. Grown men simply didn’t gain two inches of cock like this. There was only one explanation, but he refused to believe it. He couldn’t possibly be transforming into one of those... Things. Those transformed by Dr. Hawke’s serum changed completely within minutes. It didn’t fit the pattern he had been studying. This wasn’t supposed to happen. This couldn’t happen.

He needed to calm down. He tried to convince himself it was just a side effect of stress. A hallucination. He quickly got dressed and exited the stall, tucking his penis into his waistband.

He made his way back down the hall, but saw that several guards had blocked it off. From what he could hear from those gathered nearby, Samuel’s rats had multiplied at a dangerous rate, and an emergency containment procedure was initiated. Now the room was locked down, pending further investigation.

A strange sensation fluttered in Elliot’s chest. His muscles felt tense, his bones aching in places he didn’t remember being sore before. Whatever it was that he was feeling, he was afraid to let anyone know. He quickly turned around and made his way to his office.

But as the hours passed, the pressure only grew stronger.

Elliot kept up appearances, trying to act normal whenever others passed by, but he couldn’t stop the panic rising within him. He constantly tugged and readjusted his clothes to cover his growing bulge, telling himself it would go away if he simply ignored it.

He tried to distract himself with work, but nothing helped. As the hours dragged on, he felt more and more uncomfortable under his lab coat. His skin itched, and it felt as though his clothes were getting tighter. He kept having to undo more and more buttons in order to give himself room to breathe, his body temperature rising.

Unable to stand the increasing discomfort, he eventually made his way back to the bathroom. He splashed cold water onto his face, then stared at his reflection for several minutes, finding it difficult to concentrate. Still in denial about the changes that were happening, he blamed his condition on a cold he must have been developing. He wished that he had stayed home instead of coming to the lab.

He smiled faintly, thinking about David. He couldn’t have asked for a more caring and kind husband. As he imagined David serving him hot soup in bed, his mind wandered to the events of last night. The warmth of David’s body, the feeling of his hands. The way he seemed to know exactly how to please him, the way they moved in tandem as they fucked.

He felt a familiar rising pressure. He gasped, stumbling back, his breath shallow. His dick was growing again.

He quickly covered his mouth to restrain his moans, though he couldn’t help but whimper in pleasure. He could feel the veins in his cock growing thicker, his girth increasing by the second as his cockhead pushed against the fabric before his growing cock ripped through the fabric. The warmth that radiated from his crotch slowly filled the rest of his body, sweat dripping from his forehead as he panted. Desperate to quench the fire, he grasped his cock with his hand.

It sent a jolt through his body that nearly caused his knees to buckle. A large glob of pre oozed from his tip before audibly splattering onto the tiled floor. He gripped the rim of the toilet, his knuckles turning white as he struggled to keep himself steady. As he stroked, he felt as though the rush would never stop building within him, his balls aching for release. Then a wave of euphoria hit him.

Rope after rope of cum struck the back of the toilet bowl. With every shot, Elliot’s body clenched tighter with orgasm. He found himself unable to breathe, his eyes shut tight for what seemed like hours. Finally, the pleasure ebbed, his cum nearly filling the bowl as he finished.

Elliot stumbled out of the stall in a daze, his enlarged cock hanging at half mast out of the front of his ruined pants. He splashed some more water onto his face, but when he looked back into the mirror, his heart skipped a beat. His eyes were sharper, the pupils elongated into slits. He blinked and shook his head, trying to clear the haze in his vision, but he could deny it no longer; he was changing.

“Stay calm,” he whispered to himself. He was becoming one of them, one of the Vulpins, but the transformation was slow. There was still a chance to stop it, maybe even reverse it. He just needed to get to the antidote.

He cleaned himself as best as he could, restraining his cock by buttoning up his lab coat before exiting the bathroom. As he walked through the facility, Elliot lowered his gaze, hoping to hide his eyes. But he felt more changes in his body. His fingernails thickened, becoming darker, more claw-like. His teeth elongated, sharpening into canine fangs. His movement became stiffer as his muscles swelled. But it wasn’t just his body that was changing. A primal hunger gnawed at his thoughts, an overwhelming compulsion to find David.

He tried to suppress it, but it was no use. The more he fought back, the more he thought of his husband. He wanted to run towards the exit, sprint home and pin David to the bed. He wanted to rip off his clothes and shove his cock into him, to fill him with cum and watch as his stomach swelled. He wanted to breed him.

It wasn’t long before the other scientists at the lab noticed Elliot’s strange behaviour. As he tried to pass a checkpoint, the alarm sounded, and in a panic he pushed past and ran down the hallway. He dashed around corners to avoid the guards that chased him, commanding him to stop.

The transformation progressed further, and it was escalating. He was becoming taller, the seams of his clothes ripping apart from his increasing muscle mass. His penis continued to lengthen, each inch making it harder to ignore. He couldn’t help it. Each time he thought of David the transformation intensified, and the more it intensified, the more he thought of David.

He could no longer make sense of the sterile hallways of the lab. He felt trapped in a labyrinth, unable to remember which room housed the antidote. His body felt like it was on fire, his senses overwhelmed with new, animalistic clarity. He could smell the fear in his colleagues’ sweat. He could hear the faint rustle of their movements, the pulse of their hearts. He could feel his bones lengthening, becoming stronger. The muscles in his legs rippled and tightened. His penis stretched to a foot in length, slicing through the buttons of his lab coat and bursting out into the open. He left a trail of pre-cum as he ran, his skin groaning from the rapid expansion.

And as the transformation deepened, he found himself torn between the man he had been and the powerful, primal creature he was becoming. And the worst part?

He liked what he was becoming.

He approached a door and smashed its card reader with his hand, forcing the door open with his claws. He then slammed it shut behind him, toppling over a shelf to barricade it.

Dr. Harris, frantically typing on his tablet, spoke through the intercom. “Elliot, talk to us. We need to stabilize you. We can reverse it before it’s too late!”.

Elliot’s face was halfway between human and fox, the fur already creeping down his neck and arms. His breathing was ragged, his eyes wide. He could hear the frantic pounding on the door, but it felt so distant, so irrelevant. He was aware. But only just.

“I’m sorry,” he whispered, his voice now a growl.

By the time the others broke into the lab, Elliot had locked himself in a containment chamber. He stood behind its glass wall, staring at the reflection of a man he barely recognized. He was stroking his cock with both hands, desperate to quench the fire in his loins. His hips bucked, his fingers barely fitting around the girth of his member.

His pecs stretched outward, tightening and thickening beneath his skin. The rip of his shirt echoed through the chamber as his biceps swelled like balloons. His once lean frame became massive, each muscle bulging and growing in sequence.

The burning sensation intensified as his quads surged with raw power, thickening into mountains of muscle. His calves swelled, the skin tightening with a sound like stretching rubber. His pants, already strained at the seams, could no longer contain the sheer size of his legs. They ripped open in an audible tear, leaving behind shredded fabric in their wake.

His lab coat gave way soon after as his shoulders broadened, leaving him standing naked before his audience. His body was that of an apex predator, the thick fur blending with the hard muscle beneath.

His back arched as a long and bushy tail sprouted. It whipped through the air from the orgasm building within him, stronger than anything he had ever experienced. He bared his fangs as his cock continued to grow, reaching past his pecks. It tantalized him forward, the length of his engorged penis fitting snuggly into his fox-like snout as he sucked.

His entire body throbbed in anticipation, moving faster and faster, spurred by the approaching climax. Then, finally, he whipped his head back and let out a mighty roar. Gallons of cum shot out of him, coating the glass that separated him from the civilized world. The once a brilliant scientist disappeared as he became one of the very creatures he had been studying—a creature of instinct, of hunger, of lust.

Hours later, Dr. Harris walked into the lab to find a general standing alone, staring at the Vulpin safely contained behind the reinforced glass.

“You wanted to speak to me?” Harris asked softly, stepping closer.

The general glanced at him, a half-smile crossing her lips. “I thought I’d check in on your team’s progress.”

Harris nodded, his eyes filled with dread. He looked at the hybrid creature that now paced within its enclosure. “I don’t understand. Why do this? Why can’t we just cure Dr. Moore?”

The general turned to meet Harris’s gaze. “You must realize at this point that trying to cure every Vulpin simply isn’t feasible. This new plan is much more promising.”

“Isn’t there another way?”

“Things have changed. We don’t have the luxury of waiting for ‘another way’ anymore. This is the path we’ve got, and it’s the only one that might lead us to victory.”

Dr. Harris felt a knot in his chest. “And if it doesn’t work?”

The general’s expression softened, her determination never wavering. “I trust you, Doctor. Soon, we will breed an army of our own.”

David’s husband worked in a tightly secured and heavily guarded government facility which strictly prohibited cellphone use. He only received messages from Elliot once he had passed all the checkpoints and retrieved his device from security, well into the evening. So when David saw Elliot’s name flashing on his phone screen early in the afternoon, he prepared himself for the worst.

But he wasn’t prepared to hear a stranger’s voice on the other end.

“Is this David?”

“Who is this?” David asked, confused.

“David, I need you to listen very carefully. You may have been exposed to a dangerous contagion. We are sending people to get you. Are you indoors right now? And have you come into contact with anyone in the last 24 hours?”

David felt himself drifting away as he answered the man’s rapid fire questions, his mind barely registering the words spilling from his mouth. It was as if his body had switched to autopilot to prevent him from completely losing himself. He knew his husband’s work was dangerous, but it was a risk they had agreed to together. David was doing it so he could help stop the Vulpins, a relentless force ravaging cities across the country. He had prepared himself for the long hours, for the restrictions and secrecy.

But he wasn’t ready for the possibility that he might lose Elliot.

Hours passed before David could shake off the dissociation that had gripped him. Everything felt like a blur—the armed soldiers surrounding his home, the hazmat team ushering him out, the tense journey to the lab. Once inside the facility, they placed him in a large containment chamber where terrified scientists ran endless tests. They questioned him relentlessly, yet no one would tell him what was happening.

It wasn’t until Dr. Harris approached him that David finally felt some form of relief.

Dr. Harris entered the containment chamber without the usual guards, suggesting that David hadn’t been infected by the contagion. But there were still so many questions, and David didn’t want to wait any longer.

“Are you finally going to tell me what is going on?” David asked.

Harris sighed, his expression heavy with fatigue.

“I’m sorry David. We had to be sure.”

David nodded slowly. “I get it. Elliot’s told me about what you all do down here. I mean, as much as he’s allowed to. Just... Please. I need to know where he is.”

Dr. Harris removed his glasses and rubbed the bridge of his nose, clearly struggling to find the right words. After a long pause, he put the glasses back on and spoke, his voice somber.

“It might be better if I just show you.”

David followed Dr. Harris down a long corridor to an observation chamber guarded by even more soldiers. With a flash of his badge Harris set them at ease, though the soldiers’ watchful eyes never left David.

When the door to the chamber closed behind them, David immediately understood why.

He stood before a thick pane of glass, staring into a containment cell. He saw it, one of them. A Vulpin. Sitting in the middle of the cell, its broad shoulders rising and falling with each breath, its ears twitching, reacting to the slightest noise. Its massive, muscular frame was covered in dark red fur, shackled by heavy chains around its neck. Slowly, it turned its head towards the glass, its eyes shining briefly as they caught the light.

Then, in a flash, the creature lunged.

David recoiled in shock, but Dr. Harris stood still. The Vulpin’s claws swiped towards the glass, falling only a few feet short because of its restraints. After catching his breath, David moved forward cautiously, his heart hammering in his chest. As he examined the creature more closely, his breath caught in his throat. He recognized the familiar emerald eyes staring back at him.

“Elliot...!”

For a moment, the creature stilled. But just as quickly, Elliot resumed his frantic attempts to break free, tugging at his chains and swiping at the glass with razor-sharp claws.

Dr. Harris spoke gravely, his voice low. “At some point in the last 48 hours, Elliot was exposed to a sample of Vulpin DNA. It transformed him. We don’t fully understand how yet, but Elliot is no longer just a man. He’s become a hybrid.”

David’s heart ached at the sight of Elliot, his once calm and collected husband now unrecognizable, a wild creature driven by instincts.

“Is there a way to fix this?” David asked, his voice trembling. “A cure? Anything?”

Dr. Harris shook his head slowly. “Once the transformation begins, there’s no going back. The Vulpin’s instincts have overridden Elliot’s mind—his human consciousness is still there, but it’s buried deep inside.”

David swallowed hard, the reality of his husband’s fate sinking in. “So... there’s no hope?”

Harris hesitated before answering. “There’s always hope. We’re studying ways to communicate with him, perhaps even reverse some of the changes, but there’s still a lot we don’t know about the Vulpin.”

David spent the next several weeks at the facility, watching Elliot from behind the glass. Even if he could go home, he wouldn’t want to leave Elliot behind. Occasionally, the scientists allowed him to interact with his husband through the glass, hoping that some breakthrough might occur. But there was no significant change. While Elliot was calmer in David’s presence, it was never enough for them to attempt further experiments.

David would sit across the glass from Elliot, talking softly, hoping somehow that his husband could hear him. There were small moments where Elliot’s gaze softened, but it was fleeting. Every attempt to communicate with him proved fruitless, leaving David to wonder if the person he loved was truly still there.

One day, as David sank deeper into despair, Dr. Harris visited him in his living quarters.

“We’re moving Elliot to a more secure location,” Harris said, his voice apologetic. “We can’t keep him here anymore.”

David felt the weight of the words press down on him. “So, this is it? I can never see him again?”

Harris hesitated before speaking again. “What if I told you there might be a way for the two of you to stay together?”

David’s pulse quickened. “What do you mean?”

“We don’t know if there’s a way to reverse the transformation, not yet. But we’ve learned enough to understand what causes it. If you’re willing, you and Elliot could live together—as Vulpins.”

David froze, trying to process what he had just heard. His heart raced with possibilities. Would he be willing to give up his humanity for Elliot? The answer was simple. Of course he would. He loved Elliot, and if this was the only way to be together, then he would do it. But it couldn’t be that easy.

“How? Isn’t this placed monitored? How could we even—”

“I’ve been here long enough,” Harris interrupted, his tone low but determined. “Long enough to be trusted with access to more dangerous projects. I can get you what you need.”

David thought it over carefully. “Why would you risk doing this?”

Harris looked away, a distant look crossing his face. “Elliot was a good man. I considered him a friend. If there’s any chance he can find happiness, I have to try.”

David nodded.

“I’ll do it.”

David made his way through the sterile hallways, his footsteps echoing in the silence. The guards stationed outside Elliot’s containment chamber were familiar with him by now, but their gaze still carried suspicion. He approached them with a calm expression, explaining that he was being transferred out of the facility and simply wanted one last moment with Elliot, without the usual group of scientists hovering nearby. The guards exchanged wary glances but allowed him to pass, their unspoken sympathy evident in their eyes.

But David didn’t head for the observation room. He walked past it, his heart pounding as he approached a nondescript door, punching in the access code Dr. Harris had given him. The door clicked open, revealing a small chamber that would lead him inside Elliot’s cell. David stepped inside, the gravity of what he was about to do settling on him, but he didn’t hesitate.

There, in front of the cell door, he saw the flask. A small, innocuous vial of milky white liquid, just as Dr. Harris promised. David stared at it, unsure if he was truly ready to face the change it would bring. But in his hand, it felt strangely familiar. He swirled the contents gently, watching the liquid shift inside. Then he set it down for a moment, taking a steadying breath before pressing the keys on the access panel.

With a soft beep, the door unlocked. As it creaked open, Elliot’s ears twitched, his head turning towards the sound. The moment their gazes met, the excitement in Elliot was palpable. His tail flicked back and forth, his posture brimming with eagerness as he moved closer, his body tense with anticipation. David’s heart lifted, a smile spreading across his face.

“Hey there. Happy to see me?”

Elliot responded by walking cautiously on all fours, his movements fluid, almost instinctive. His eyes darted toward the observation deck above them, scanning for signs of the scientists’ watchful gaze. David, sensing his unease, held out his hand in a calming gesture. “Don’t worry. Nobody’s watching. It’s just you and me now.”

Elliot gave a low growl and lowered himself, his eyes never leaving David’s. His movements were tender, though the excitement in his eyes was unmistakable. David could feel his own heart swell at the sight, at the thought that they could finally be together, no longer separated by glass. “I won’t leave you again, I promise.”

Without another word, David took the flask in his hands and drank its contents in one quick motion. It was cold and salty, and strangely sweet, the taste familiar. He felt a tingle on his tongue, the liquid spreading a warmth through his chest as it traveled.

“Is this... cum?”

David’s body jerked as the transformation began. He gasped, trembling as the warmth in his stomach spread, making every part of his body ache in succession. His bones groaned, his muscles spasmed, and he felt every fiber of his being shift.

David heard Elliot whine, his voice low and concerned. He moved closer to David, as if trying to offer comfort. David, all the while his muscles twitched and clenched, tried to reassure him. “It’s okay, Elliot. I’m fine.” But his voice deepened mid sentence, his throat bearing the full intensity of the transformation.

Elliot’s body froze momentarily, his ears flicking back, but the creature did not pull away. Instead, he edged closer, taking in David’s scent with a deep inhale. David could feel the sweat covering his skin as it began to stretch and shift. His torso broadened as it sprouted fur, thick and dense. His clothes tore from the strain, his muscles bulging and flexing involuntarily. The process was painful at first, but each moment of change brought a strange sense of exhilaration within him. He felt alive in a way he had never felt before.

A wave of dizziness overtook him as his spine elongated, a tail growing at its base. He stumbled forward, catching himself on Elliot’s muzzle. Elliot took another deep inhale, furrowing his nose into David’s crotch. David could feel it, a rising pressure in his loins; His cock throbbed violently, each pump of his heart making it strain more and more against the fabric of his pants. As Elliot took in another huff, the rush of air against his sensitive cock made David buck his hips forward, an involuntary moan escaping his lips.

As his body continued transforming, David’s senses sharpened to an incredible degree. Every scent in the air became incredibly distinct, though the musk emitted by Elliot was intoxicating. David pressed his face into his husband’s fur, grasping it tight between his fingers. He felt a surge of instinct, an overwhelming urge to surrender himself to Elliot. He briefly resisted, the human part of him trying to hold on, to maintain control. But as the transformation continued, the resistance faded.

As David’s body grew and stretched, edging closer to Elliot in terms of height, the two men pressed their bodies against one another with greater intensity, finally able to share a kiss. David’s cock continued to stretch further, its skin becoming taut and purple from the strain of adjusting to its new shape. He could feel his organs shift and make room for a new cavity, a slit opening between his thighs, dripping with fluid.

Despite the transformation not yet being complete, Elliot could no longer restrain himself. Through the frantic excitement of their movements, David found himself on the ground, his legs spread wide as Elliot mounted him. His throbbing cock pushed deep into David’s newly formed vulva, flooding him with new thrilling sensations. They panted in unison, water condensing on the glass as their combined body heat turned their breath to steam.

David was tense, his body still stretching and growing. His hands—now clawed—flexed instinctively. His fingers curled around his husband’s, their hands clasping together. He could feel the weight of his body increasing, the power in his muscles growing. He felt as though he could maintain this rhythm forever, growing more and more powerful. Everything about this form felt... right.

As the transformation neared its end, David tightened his grip on Elliot’s cock. Elliot moaned, pushing himself even further in. Finally, his knot pushed past David’s vulva, and with a gasp, the floodgates opened. Elliot’s teeth clenched from orgasm, his cock pulsing harder with each shot of cum he pumped into David. David dug his claws into the floor, scraping deep into the concrete underneath. He could feel his womb distend as more and more cum filled him, not only with potent seed but with satisfaction.

Eventually, as their orgasms subsided, the two Vulpins collapsed to the floor. They held each other close, all worries of the world outside fading away.

“I love you,” said David.

“I love you too,” replied Elliot.

And as they cherished their reunion, they felt something new beginning to form between them. Elliot watched with fascination as David’s stomach swelled, ballooning out with the rapid signs of pregnancy. David felt life form inside him, life that pulsed with heat and energy. His hands slid down his torso, his fur now thick and sleek, the red-gold color of a fox’s coat. The two Vulpins looked at each other with glee, excited by the prospect of starting a family.

Meanwhile, within the observation deck, General Griggs stood watch, staring at the Vulpins safely contained behind the reinforced glass. A half-smile crossed her lips as she whispered to herself.

“Finally. Everything’s going according to plan.”

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