Critical mass

by UberPump   

Bryan is just a High School Senior, ready to get his miserable life over with at this wretched place. No one seems to notice the small, scrawny 5-foot-3 teen, with the exception of the school bully. Albert teases Bryan all the time, his goons joining in. After school, Bryan stumbles upon one of his dad’s latest creations at his Bio Medical Research facility ande decides to take the mysterious serum in hopes of one-upping Albert. Bryan’s life, and body, changes forever. But there are side effects that none of them foreseen...

This story was commissioned by Raging BD (Twitter: @XbikXBd).

“Hey! Would you look at that… the little dweeb is staring at us.”

I hear the deep booming voice of Albert, the school bully, jerking me from my daze.

“Like what you see twerp?” He walks over, his massive quads shaking as they tense and relax. The ample bulge from his massive cock and balls jiggling from side to side, pushed forward from the lack of thigh gap on his quads. His broad frame darkens my position in from of the locker room bench where I’m changing.

“I… uh.. just.. uh…” It’s not an unknown fact that I’m gay. The whole school knows about it. To make matters worse… I’m a shrimp. Not a twink, not a hunk, but a 5-foot-3 skinny bean pole of a shrimp.

“Ah… look at his little prick. Barely making a tent… what is that like 3” or so?”

“Cut it out Al!” I swat his hand away as he goes to try and pull down my briefs as I begin to stand up…

“Hey now… we all know you like this…” he says, grabbing a massive handful of his overflowing boxer briefs. The bulge squishes in between his fingers as the fabric oozes in between them. I can see his massive nuts shift inside his skintight underwear. His thick arms flexing a bicep pose as he grabs with the other.

*RIP*

He yanks down my underwear exposing my 3” prick to the locker room. The other lads in there notice, some snicker while others turn their heads in disgust. All the while Al’s laugh is booming throughout the space.

“You call that a dick? This is what a real cock looks like!” he says as he proceeds to pull down his own, skintight underwear. The basket of his package expands outward as the compression of his briefs release his junk, the flesh swelling outward like a busted can of biscuits.

My cock throbs at the sight… a bit of pre-cum forms on the tip as my embarrassment is out done by the massive man’s display of masculinity before me.

“Ha… Shrimp. Looks like you better take care of that little dicklet of yours, better not… bust a nut in front of everyone,” he chuckles, wagging his 9” soft, nearly wrist thick cock. His balls hang low in their sack as his massive nuts swell outward in the flesh like a couple of medium potatoes. He pulls up his briefs, having to lift his balls and stuff the meat inside his too small briefs.

My little cock throbbing proudly as much as it can out in the open… His laughing caused his thick pecs to bounce on his frame. His broad shoulders overwhelmed by thick round delts as his lats force his massive arms to sit on top of them, himself unable to close his arms to his side. Him high fiving his ‘other’ friends cause his triceps to jiggle on the back of his arms…

“mmmmph… no… not… here… unnnngugh…” I moan rather loudly in fact. My cock spurts a small amount of cum from my little balls. The throbbing is intense as I try to tear my embarrassed face away from the hot display of male perfection before me.

“…” 

He looks at me. I look at him. Our eyes meet. For a moment I thought I felt a connection here with him… then his face turned to annoyance.

“Really… you came in the locker room dweeb? That’s disgusting! Clean that shit up before the coach comes in here!” He shoves me as I fall onto my butt. His hulking frame disproportionately larger from down below as he walks away. His bulbous glutes filling my vision as his frame disappears from the locker room. 

I sit in silence, wiping the cum up from the floor. Sitting on the floor with my legs crossed, my cock still semi hard… stroking it. A feeling of remorse, disgust, and anger fills my chest as I scope out my body in the mirrored wall across from the lockers where I sat. Tears well up in my eyes as I only dream of one day having a body like his… bigger even.

Looks like this Senior Semester can’t end any sooner before graduation starts. The faster I can get into Molecular Biology at my Local University, the better.

“Hey son!” My dad’s voice booms at me with enthusiasm.

My dad, his name is Richard but everybody calls him Dick, is a lab rat. He’s not your typical lab technician. His body is broad, square and his muscled frame fills out his lab coats and his dress clothes quite well. I wished I had inherited his genes…

“Hey dad.” I say, my tone alerting my dad to my obvious annoyance.

“What’s wrong bud? Talk to me,” he says, walking over. I sit down on the metal stool in front of his workstation… full of vials, computer monitoring equipment, medical devices like syringes and needles all neatly packed behind a sterile glass cabinet. Computers buzzing in the lab…

Oh… I almost forgot to tell you. My dad works for the government for genetic research and the like. Shhhhh, don’t tell anyone. I’m not even supposed to be here.

“It’s just… I… I wished I was huge. Like you! Why do I have to be so damn small.” I say, slamming my fist on the table.

“Huff…” my dad sighs. “Look sport… I know puberty hasn’t been quite what you hoped for but…”

“It’s too late for that dad… I mean. I’m already 18 and I haven’t grown up since freshman year! And to top it off, I’ll be one of the shortest guys to enter the college campus next fall semester! This sucks…” I say, crossing my arms on the table and resting my chin on my hands.

“…buuuut give it some more time. There are cases of late bloomers even at your age! Who knows, you may end up having a summer growth spurt… Lord knows I did at your age! Ha… he….” My dad chuckles…

*Huff* I sigh.

“Listen… I know how hard it is to be small. I was once your size too. Growing up I was just as small as you. Then one day, bam! My body went into overdrive, and this is what I ended up with…” Motioning to his stout 6-foot-5 frame. His body is indeed impressive. More, muscles bulging with a layer of fat covering them slightly. More of a himbo look than a man. He places his firm palm on my back, leaning down next to me…

“What’s this?” I say, pointing to the vial in the glass cabinet. Only now noticing the empty syringes on the table near my face. 

“Oh that…” he chuckles… “My partner and I were working on a serum for the *Super Soldier* program,” he says in air quotes.

‘Super Soldier… more like Super SWOLE-dier…’ I think outloud, chuckling at the idea of hulking masses of muscle lumbering their way across a battlefield, barely contained within their camouflage uniforms.

“Did it work?”

Did I mention my dad works for the military? I did, didn’t I? Well… let’s just say his research is a bit… experimental, designed in a way to that can suite our fellow men and women on the battlefield.

“Work… yes. In some respects, but not as intended. Never mind that… I was just gonna say…” He stops speaking as I reach for the cabinet and withdraw the vial, giving it a thorough look over.

“Oh no. That….” he takes it from my hand and sets it down on the table “…is not for you. Besides, the side effects are unpredictable.”

“I just wanted to know what it was. I haven’t seen it in here yet and I’ve helped with your research some before… Especially with this hunk a junk.” I walk over, kicking the tall standing pod. The machine takes up more than half the space of the large lab room…

“Careful now… you remember how dangerous that contraption is…” he says, walking over he places a hand on the side of the behemoth machine. “What I wouldn’t give to make this thing work properly… we just need the right catalyst to produce the desired results.”

I see my dad longingly looking at the machine, rubbing the cold metal.

“Hey Dick! We need you in the board room…” Another man’s voice echoes from the doorway…

“I’ll be right there!” he yells back. “Stay here and try not to get into trouble,” he winks at me…

I look back up at the hulking pod like machine. The cold metal contraption longing to be turned back on as the touch screen sits silently in sleep mode, pulsing a light blue as it fades back to black.

Turning my attention back to the vial that my dad left on the table, I walked over. Inspecting the contents, I realize it has been punctured, fluid having been withdrawn from the container.

“What are you up to dad?” I say, seeing the name of medication…

*Exp #325—Elongro

*Batch #14

That was all the label had stated. Sliding over to the computer, I log on using my dad’s pass he loaned me while we worked on the Super SWOL-dier machine.

“He… he…” I chuckle every time I use the misnomer I created for the massive device.

“Well… let’s see what we have here in the database.”

Scrolling through the files I stumbled upon a file labeled as ‘Critical Mass Experiment 325-Elongro’.

“Bingo”

With a click of the mouse, I open the file… hundreds of files from cadets to generals to corporals you name it have been saved within the system. All medical histories, testing information, and agreements signed to the testing of this drug.

“Whoa…” Clicking on a Marine Cadet’s profile.

His stats listed on various pages…

Age: 21
Height: 6ft
Weight: 245lbs
Build: Muscular/Athletic
Cock Length/Girth: 7” x 6”
Testicle Length/Width: 3” x 2.5”
Testicle Volume: 61ml

“Dang, the guy has a massive set of nuts. Judging by that description, those are Jumbo egg size….”

Before and After Pictures show a disgusting display of masculinity…

“Oh my god…”

My hands shake as I scroll through the pictures…

The guy was huge in the pictures. A broad chest and thick shoulders dominate his upper torso. His arms huge biceps inflated as he poses a flexed front biceps with his left arm. Measurements seen at 21 inches around. Most of the bulk taken up by the man’s huge triceps. The meat travels down his arms as his forearms flare outward, veiny tanned dark skin. Hands of a man, large and calloused from years of pumping iron. His torso narrows down to a sharp V shape as his abs and obliques sharpen. His body then swells outward again as his hips and thighs and calves take over the scene again with bulging mass.

The next picture… Completely naked.

A ruler stretched outward beside his hard cock confirming its length, the next a tape measure wrapped around the fat shaft confirming its thick nature.

Balls measured with calipers as the flesh seemingly overflows the device.

“The…these are before?” I’m stroking my hard cock through my jeans.

Click

“Holy fuck!”

The man I see is bigger, more muscular. But the real difference is his cock and balls… they’ve nearly doubled in size. The look of concern on the marines’ face coupled with what appears to be a heightened sense of arousal and desperation. Veins bulging on his neck and on his lower abdomen pointing to the massive cock and balls plopped between his now spreadeagle stance.

Height: 6ft
Weight: 255lbs
Build: Muscular/Athletic
Cock Length/Girth: 15” x 10”
Testicle Length/Width: 6” x 4”
Testicle Volume: 1.24 Liters (41oz)

I can see the definition of skin on his Uber Inflated junk… His facial expression strained, drool forming from the corner of his mouth. He’s gripping his fat tool hard with his hands. The side profile of the ballooned-up cock gives a whole new meaning to size. His balls swell outward from his sack as it’s pulled tightly across the surface.

A lot of technical notes below have been redacted save for the last sentence.

“Dosage at 3cc of Exp 325 resulted in subject’s genitals increasing to a critical mass event. Immediate evacuation of seminal fluid from the testes and vascular fluid from the phallus was needed to prevent further growth/imminent tissue failure. Experiment failed to produce the wanted muscular increase. Higher dosages deemed unsafe.”

“So, this guy’s dick could’ve gotten bigger???” I wonder, my hand absentmindedly stroking my cock.

I look over to the vial still sitting there.

“If 3cc did that to him…maybe I’ll be safe taking only 1cc…” I slid off the chair. Thinking back to how Al humiliated me in front of the guys at school.

“I’ll show him…!”

Swiping an alcohol swap from the cabinet along with an unused syringe, I attach the 18-gauge drawing needle. Drawing backward, pulling air into the syringe all the way to the 1cc mark. Not wanting to go too far.

I plunge the needle into the vial stopper and turn it upside down, forcing the air into the vial as I then begin drawing back the needle, pulling the fluid inside. Once filled to the 1cc mark, I remove and replace the needle with a 25-gauge injection needle.

“Dick, are you sure this is the right thing to do?” my partner whispers in my ear as we watch Bryan prepare his self-experimentation from our observation cameras.

“Sshhhhh… just watch. I’m at least letting him have a taste of what being a man feels like. He’s been small all his life. Let him try this out. If it gets too dangerous, I’ll stop him. Just observe…”

“Oh… the military isn’t gonna like this one bit…” the thicker shorter man grunts behind me in a scruffy voice.

After removing my pants and lowering my underwear, I prepare the spot on my right butt cheek. Plunging the needle deep into the muscle, I pull back ensuring there’s no blood as I’ve seen my dad do for many years. Seeing no blood, I start pumping the serum into my glute.

“SShhhh… ah… That stings.” As I remove the syringe, dabbing the little blood spot with an alcohol pad. Seeing no one is around still, I leave my stool undressed, only a shirt. My baggy black T-shirt.

Walking over to the big hunk of metal, stroking my cock, I begin fantasizing about what it would feel like for this yet additional failure to pump my muscles up too. God I’m so hard after that injection… I’m so damn nervous my legs are wobbly. What’s it gonna feel like? The growth…. 

“Mmmph…” I feel my cock throb harder than it has ever throbbed before. I feel it pump up with even more blood. The veins stand out in stark relief as another throb hits my fully erect 3” cock.

That’s when I feel it…

*PULSE* *THROB* 

I feel my cock swell in my palm… 

“Oh god… OH GOD… It’s… it’s burning but feels so good!” I moan, propping my hand against the cold metal of the machine before. A pressure builds in my cock as another feeling envelops my dick, one that can be described as hooked up to an air compressor. I throw my head back, arching my back as I hump the air.

“Nnnuhguh!” I groan, the feeling dissolves any ounce of free-will I had left. Finding a place to get more comfortable, stepping up into the machine where there’s a chair inside, I take a seat as the feeling swells upward.

My cock is ballooning up constantly. I can feel the skin stretching to accommodate more cock meat. My testicles are boiling at this point as they begin swelling with cum.

My balls feel like lead weights as their size expands. I can feel the testicle meat squirming inside my sack as they pulsate larger and larger. I feel my sack stretching around them as my bag inflates, veins popping up on the sack as it sinks further and further southward.

“It’s working! I’ll have a cock just as big as yours Al, just you wait!” I say, stroking the fattening cock. My dick continues swelling as a fullness grabs my attention. My cock is an angry red color, my balls pressing harder and harder against my sack as they drape over the side of the weirdly shaped U- cut out of the chair. My balls seize up… Preparing for my imminent cum explosion… I remove my shirt so as not to ruin it with the drenching of cum that’s about to occur. I toss it outside the machine…

“Nughugh…” My toes curl as I look down, the feeling of cum gurgling inside my now jumbo egg sized balls has me tearing up with pleasure. A drop of cum falls on the floor from my large cock.

“I… I can’t believe it… It’s so big.” I tear up, from pleasure and satisfaction of having a bigger dick.

The look of the veiny shaft, thick and broad in its newly inflated size, reaches 8” at least in length. I can feel it still swelling as more blood is forced into it. My hips are kegeling hard up and down causing my balls sack to sway heavily below the chair’s opening. My cock getting tighter and tighter as it begins turning a shade of crimson red. A feeling of panic sets in as I remember what my dad said about side effects…

“MMmmph… shit. Maybe I should’ve gone with a less amount. Fuuuuck…” I moan, my cock not getting any longer now as its girth begins to fill out. I see the shaft swelling outwards as my cock chambers balloon and inflate fatter and fatter. I’m stroking quickly now as I feel my balls graze the cold metal floor…. Cum is seeping through my cock head and dripping down onto the floor below...

“God, I need to cum… My balls are so big…” reaching down, groping one nut as it overflows the palm of my hand.

“Oh… god… It’s just sooooo thick. I can’t even wrap my hand around it!” The dense cock meat is overflowing my hand at this point.

“Transformation protocols initiated: 5% power engaged… Sequence starts in 5… 4…

“What the fuck!” I’m brought out of my stupor, just as my cock and balls stop swelling to the humming of the machine starting up.

3… 2… 1

“Sequence Initialize… 8% body mass increase…”

The lights grow brighter in the chamber I find myself sitting in as the door closes automatically. I stood up in a panic, my father and his partner rushing into the lab in a panic!

“What Happened!?”

“I dunno, dad…. It just started up!” His eyes gaze downward in a wide-eyed fashion as my big fat, throbbing cock presses against the glass of the door.

A mist begins filling the chamber…

“DAD!”

“Hang in there bud! Quick how long to deactivate the sequence?”

“I… Uh… the system is locked out… I can’t override it!”

I look at my dad as he looks back at me. My hands go to the glass of the chamber as a sudden electric shock hits my body….

Pressure fills my muscles. A full body pump envelops every muscle fiber as a wretched scream billows out of my throat…

“Oh my god…” my dad says, backing away.

“Dick… how’s this happening?” His partner asks, Dick just stares.

I look at the two men, my bones ache, my muscles feel warm. Then… 

*THROB* 

My muscles grow….

“Nuuuhgh….” I hunch over, another pulse and my muscles swell again. I feel my abs tighten as I lean over, then I feel it again…

My pecs heave outward forcing my torso to stand up. My back muscles tense as my traps swells up my neck, I can feel the fibers breaking down and rebuilding over and over again as my body convulses with pulsating muscles. My pecs bulge outward once again, the skin tightening over the surface of my newly formed chest.

My biceps and triceps *THROB* as they swell outward as thick balls of flesh. Unflexed, they look huge on my short arms. The muscles bunch up, flex, swell, and flex again. 

*THROB*

“OH god… So much muscle.” I let out a deeper voice. My arms inflate like a couple of pythons ready to strike. Veins bulge along the surface… from my fat football sized bicep to the horseshoe shaped tris on the back of my arms. The muscle flapping against gravity as I alternate between jerking off and groping my meaty body.

I feel my neck bulge against my growing traps as my short frame fills up with ridiculous bloated looking muscles. All of it packed onto my 5-foot-3 stature.

“Help… me….” I feel my pecs inflating once again. My swelling delts fight for space on my shoulders. Their round defined shape like a couple of bowling balls crammed underneath my paper thin skin. My arms struggle to stay straight as my lats heave, throb, and swell as the meat widens my back further. My back arches as my traps suddenly heave outward, forming a back shelf with two rounded globes to rest a heavy ass barbell upon. My lats once again swell wider, I feel the skin creaking and groaning as my muscles fill it to the brim. I feel a *pop* as a stretch mark wraps its way around the side of my newly grown wings.

All the while my cock is going crazy… my cannon like dick… huge on my frame before is being dwarfed by my swelling quads. My thighs are pushing my balls forward as they have nowhere to go… the sweep of my legs widens further and further as my lower half catches up to me. The tear drops in my quads are so pronounced, so heavy that even the slight shift causes them to shake. My outer quads look like someone stuffed a massive balloon within them and went ham. They wobble, quiver, twitch, then swell again. My basket is feeling cramped as even it too has continued its growth.

I’m looking like a muscled-up blimp piled onto a child’s frame… 

“Oh god… Oh god…!” I feel full, fit to burst. 

My muscles are crammed onto my short frame as my pecs begin to touch my chin, like two dense pillows swelling outward. I feel them throbbing bigger and denser, the skin pulls hard at the creases of my folded skin. My delts and pecs fight for space… folds forming along the edges of the defined muscle as my skin struggles to hold it back. I feel the deepening crevasse of my pecs growing ever more crowed as my pecs continue to grow wider and wider. I see a purple streak cross from my delt over my pecs. Over the vast, bulbous mound of meat, stretch marks appear on the stressed overinflated flesh. My nipples are burning an intense pleasure as they stretch wider and wider. My pec muscles round outward in front and to the side as my nipples point southwards.

My legs were crammed with so much meat as they rub horribly against each other. The skin raw from the pressure of my inflating muscles pressing together, fighting for space.

*CRACK* *CRACK* 

I feel my bones begin to stretch. My vantage point is growing higher and higher as my spine stretches. My body feels like I’m being pulled, drawn and ready to be quartered. The growth accelerates as my height changes rapidly, my cock gushes cum like crazy… my balls swelling up bigger. My cock getting tighter and tighter.

My feet begin to ache as I see them stretching bigger. My measly feet pop and stretch as they scoot across the floor of the machine. They grow with an intensity so veracious; I thought my toes would tear through my skin. Surpassing some of the biggest feet I’ve seen, approaching then surpassing Al’s own size 13’s, their advance halts slowly as they throb. Their musculature is more defined as the width of those feet suddenly spread outward. I feel my feet go from narrow to wide in seconds. Having thought my muscle growth was limited to my torso and legs, my feet did not want to be outdone.

My hands expand as my body continues its onslaught of growth. Just like my feet they too expand, massive palms nearly as large as my dad’s own meaty palms. Hands can hold a basketball in one, not two palms. The muscles flex, crunch, then swell as my hands larger size increases with the muscles inflating within.

I see stretchmarks form across my biceps as the skin stretches across the expanse of my ballooning muscled flesh. 

As though it felt like I was about to pass out from all the mind-blowing pleasure.

My height stops growing.

My muscles relax as a slow, release of pressure envelopes my body.

I feel my cock throb, my balls pull up hard against the gravity they’re fighting against.

“Nnnnnnnghugh!” My moan is much much deeper. A baritone compared to my squeaky voice from before.

I swear with this final act of muscular defiance, my cock swells even more so than before…

With a small sound akin to a leather balloon inflating beyond capacity, a creaking sound emanates from it as I latch onto the fat ass dick in my hands. My entire blimped up muscle suit tenses in a rage, flexing causing my skin to groan, squeal in a defiant rage making my muscles swell a bit more… finally lets loose.

A gush of cum races through my large cock as my balls unleash their pent-up rage. I feel my nuts slowly begin to deflate as my cock grows soft in my big hands. Letting go of my huge new cock, it flops down onto my balls as their heat rests moistly on my sweat saturated body.

*Woosh*

The door opens as I stagger through, collapsing with a loud thud. My body exhausted from the onslaught…

A burning sensation encompasses my skin. A feeling of warmth akin to a great pump after a workout floods my mind in endorphins. The weight of my body feels compressive, sagging with muscles as it lays there like a big meat sack bulging all over the place.

The weight of my muscles spreads out on the cold tile floor, my pecs smashed against my left arm as I begin to press myself upward. Staggering upward, unused to the amount of mass on my body and the new perspective my increased height has given me makes my head spin.

“Son… you… okay?” My dad walks up to me. I look up, meeting his shoulders with eyes instead of his chest.

“I… I… grew…” I say with a huff. “But… how did…” I motion to the machine, catching a glimpse of myself in the mirror.

What I see makes my cock stiffen once again. My hands explore my meaty pecs, shelves protruding respectively off my chest like a couple of swollen half mounds. My shoulders full as my delts create a sweeping wide gait. My traps rise off my upper torso like a couple of doughy hills. My lats flare outward underneath my thick arms. Veins fill my biceps and forearms as I flex a bicep, then a triceps as the bulging masses explode from my arm. My thighs broaden out to the sides as my calves swell surrounding both sides of my shins. The true star… highlighted by my thick brick 6 pack… rises to the occasion. My cock is so heavy and full as it grows erect, I feel like it could cut through steel. The thick, wrist thick cock bobs up and down as my balls squirm, raise, and lower in the sack of meat of my pulsating scrotum.

“I’m… thick…”

“Bryan… Bryan!” My dad snaps his fingers at me. That’s when I realize, him standing next to me… I’m still not as big as Albert. My mind is interpreting this new body as the most massive thing it has ever seen… but…I grew… I grew.

“Let’s get you back to the observation room for some testing. We need to monitor your health…” he says, grabbing my shoulder. I feel his hand encompass the meaty delt as I slowly turn and look away from the muscular me in the mirror…

“The serum… this must be the serum’s doing…”

My mouth, covered in drool as my body throbs. Muscle soreness engrosses me as a hypnotic gesture toward my increased stature and muscular girth.

I want more.

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