by TreborNawoc

 Sebastian’s experiment to transform himself into a multi-hunk worked, and then some! He can’t wait to show off the results to his best friend, Gavin.

Added: Dec 2021 Updated: 8 Jan 2022 4,748 words 6,844 views 5.0 stars (175 votes)


After waking up on the floor of his Lab and discovering that his experiment had worked and his body had been transformed, Sebastian quickly cleaned up the mess and rushed home. He was glad it was night-time and he could get home without being spotted. After getting home to his small apartment, and taking a few seconds to walk his long body through the door, he locked himself in for the night and went to take a good look at his new self.

Looking in his bathroom mirror (whilst his legs were still out in the living room) he stared at the gorgeous face that stared back at him—gone was his acne, his tired eyes, his thin lips. In their place he saw a smooth skinned, bright eyed, pouty lipped (times two!) stud.

“Fuuuuuck,” he said out of both mouths. Reaching for his pockets to locate his phone he at first couldn’t find them, then he remembered that his body was a lot longer than when he woke up this morning, so manoeuvred his remarkably flexible spine to allow him to reach his legs. Picking his phone out of his pocket and putting his earbuds in, he phoned his best, and only, friend Gavin.

“Hello,” came Gavin’s voice.

“Gavin,” Sebastian shouted excitedly from both mouths.

“Hi Seb, is someone there with you?” Gavin asked.

Realising he should probably just use the one mouth, Seb opened his top mouth and said, “Oh, no, but I will explain in a sec. Are you on your own?”

“No, I’m sitting in the living room with mum and dad. I’ll head to my room just now,” Gavin said, and started walking up the stairs to his bedroom.

Seb waited, not realising he was holding his breath, but also noticing that he didn’t have any discomfort either. “Okay, that’s me in my room,” Gavin said. “What did you want to tell me?”

Seb grinned from both mouths before saying, “Well, you might not believe this, but…” and then told him about his discovery of the bee, creating the transformation formula, the accident in the lab and then getting home…

“Oh, come on Seb, like that’s ever going to happen,” Gavin said, not believing a word he said.

“Okay, I’ll send you a picture,” Seb said, before taking a selfie and messaging it to Gavin.

“Oh, come on, that’s been photoshopped,” Gavin said, still not believing him.

“Aaarrgh. C’mon Gavin, I swear it’s real! Look, switch to video and I’ll show you,” Seb said, getting frustrated.

Switching to video, Gavin suddenly saw that it wasn’t photoshop, and Seb really did have two mouths. He also noticed that his body seems to extend out of the bathroom and into the rest of the apartment. “Holy shit Seb,” Gavin said slowly, remembering his parents were downstairs, “how the fuck….”

Gavin started getting hard looking at Seb—the Seb who was a scrawny little thing, who now had big arms, rock hard abs and lots of them, and with a gorgeous face with two kissable mouths. Gavin and Seb had been inseparable friends since school, being considered the ‘science nerds’, avoiding physical exercise and generally being physically unimpressive. That bond had continued through university, and now they both worked at the same lab, avoided by all the other co-workers just like at school. But this new Seb wasn’t just a hunk, he was a super hunk. A pang of jealousy went through Gavin, followed by realisation that this new Seb might no longer want to be his friend…

“Gavin, Gav, Earth to Gavin,” Seb was saying, “you still there?”

“Sorry, was just drifting off,” Gavin said, sadly.

“Hey, what’s got you down?” Seb asked.

“Oh, nothing.”

“C’mon, tell me,” Seb prodded.

“I’m just guessing that now you’re a hot super hunk you won’t want to be my friend anymore,” Gavin finally relented.

“Oh, come on—wait, you think I’m hot?” Seb said with a blush. “Like really?”

“Yeah, I always liked you but now it looked like you’re going to be looking for someone other than me…” Gavin said, with tears starting to fall from his eyes.

Seb started to well up a little too. “Oh Gavin, I… I… well, I have always wanted to be with you, but I always thought you’d reject me as I wasn’t anything special,” he said.

Both boys had a little chuckle at each other. “So here you wanted to be with me, and I wanted to be with you, and you had to turn yourself into some sort of superhuman just to get up the courage to ask,” Gavin chuckled, tears still sitting on his cheeks.

“Well, now that you mention it, would you? You know, go with me?” Seb shyly asked.

“Of course,” Gavin said.

“Great!” Seb shouts from both mouths. “Want me to continue showing you my new body?”

“Yeah. I can’t wait to see it for real,” Gavin replied.

Continuing to film along his long torso, Seb continues talking to Gavin, telling him that he can tell that his internal organs have also changed as he can feel different pulses at different parts of his body. Gavin suggests using the MRI machine in his lab to see what the changes inside Seb are. Eventually they reach Seb’s legs. “Wow,” Gavin said, “look at that bulge.” This got Gavin hard again and he started rubbing his cock from outside his trousers.

“Would you like to see it?” Seb teased. “Will you just… pull your trousers down?” Gavin said a little too loudly, hoping his parents didn’t hear.

“Your wish is my command,” Seb said and pulled his trousers down, revealing a soft cock as thick as a pringles can, and twice long.

Gavin whistled and, forgetting he was on video, put his hand down his trousers and started jerking slowly. “Oh, you like that,” Seb said before grabbing his long cock and showing it to Gavin.

Continuing to video bits of his body, Seb took his cock in his lower mouth, which opened wider than he’d ever have imagined, and started to suck on it, noticing that his gag reflex was gone—which was handy as his cock extended right down one of his throats. As he did so, he kept talking to Gavin. “Fuck Gavin, you’re never going to believe this. I’m sucking my own cock and talking to you at the same time! How fucking cool is that?” Seb said before reversing the camera on his phone to show his face. He smiled with his top mouth whilst his lower mouth was going to town on his cock.

Gavin came at the sight. “Shit Seb, how wide can you open your mouth?” he asked.

Seb didn’t reply but started opening his upper mouth wider, and wider, and wider, until it looked like it could swallow his fridge-freezer in one go. Gavin got hard again. “Oh Seb, I wish you were here right now. Oh, the things I’d love to do to you, or have you do to me…” he trailed off.

Seb closed his mouth and said, “Tomorrow night, your lab?”

“It’s a date!” Gavin said. The boys said their goodbyes, and Seb started to give his cock some real attention. It wasn’t long before he blew his load, cumming for nearly 15 minutes, with a slight bulge appearing in what he determined was one of many stomachs. Oh yes, he thought, this new body is going to be fun.

Sebastian and Gavin met up at Gavin’s lab the following night, under cover of darkness as Seb still hadn’t told anyone about his changes. Gavin was waiting to let Seb in when he saw the silhouette of the tallest man he had ever seen walking towards him. He took his glasses off and cleaned them, just to make sure it was real.

“Hey Gavin,” the tall man said in Seb’s voice.

“Holy shit!” Gavin blurted out. “I know you showed me on the phone last night but seeing you for real…” He drifted off as his cock got hard.

“C’mon Gav,” Seb said, bending and contorting his long torso so that he could look Gavin in the eye, “let’s remain focussed on what we’re here to do. Then we can go back to my place for some… fun.”

“Right,” Gavin said, remembering the task at hand, before playfully saying, “let’s give you the full physical.”

Gavin told Seb to strip down so that he could do a complete check-up. As Seb stepped back into the room, Gavin caught his breath at the sight of the super hunk of a man stood in front of him. He had to keep reminding himself that this was his friend Sebastian—once a short, gangly, tired looking geneticist and now a fresh, super tall, muscular dream. Looking down his body from his gorgeous face with those two pairs of full lips, down past his huge pecs, to his abs, continuing down his abs, still continuing down his abs, a few more abs, then—fuck me he thought—that elephant’s trunk of a cock framed by two muscular legs. Swallowing to clear his throat, Gavin asked Seb to come over and start the tests.

Starting with his mouths, Gavin checked Seb’s throats, with Seb chatting away while Gavin looked at the other mouth, before swapping over. They discovered that Seb now had two separate throats, although they weren’t sure how far down they remained separated. They also discovered that Seb’s tongues were very long—longer than his own body (which they discover is now 17 foot 1 inches tall).

Making his way down the torso, Gavin noticed that there are multiple pulses indicating more than one heart—which means there’s probably multiples of most organs he thought to himself. Reaching the waist (32 inches, he noted), he checked Seb’s ball sack and found that there were 3 enlarged testicles in there. The soft cock was also 8 inches around and 20 inches long. “Okay,” said Gavin, “let’s get you x-rayed!”

The x-ray showed the incredible changes that Seb had undergone under his skin—8 separate hearts, 9 stomachs grouped in threes, and 22 lungs. Tests done, the boys headed back to Seb’s apartment.

The two boys got through the door and into the living room. Gavin, despite being horny and desperate to feel Seb’s monster of a cock, also panicked at the size. Seb, feeling the same panic, was worried that he would hurt his new boyfriend—his slowly hardening cock was already as long as Gavin’s torso, and getting bigger by the second. “Gav, I’m scared that I might hurt you here,” he said, feeling sad but having to be honest.

“I’m scared myself. Maybe we’re going a bit too fast here. It’s possible we won’t be able to do what we hoped we would,” Gavin said, his voice sounding disappointed.

“Well, I know something I can do,” Seb said. He slowly started to pull Gavin’s trousers and boxers down and took his 5-inch cock hard into one of his mouths.

“Oh fuck Seb, that feels amazing,” Gavin said, experiencing a blowjob for the first time. “It’s the least I could do,” Seb said as he kept sucking.

The boys eventually just chatted until the sunrise, Seb sucking on Gavin’s cock, and fucking him using one of his tongues. Eventually, Gavin started to fall asleep. “God, you must feel fantastic,” Gavin said to Seb, “I wish I had been stung by one of those bees.”

Seb felt a pang of guilt at having lost all the data on the formula. Suddenly a thought came to his head…

Lifting Gavin to his bed, removing his glasses so that he was comfortable, Seb made his way back to his lab—the first time he had been out in daylight. He didn’t care that people saw him as he was determined to recreate the formula one more time. As he passed the other scientists in the lab complex they all stared and pointed, not knowing who the attractive multi stranger was.

Eventually someone from security stopped Seb. “Excuse me. sir, this is a restricted area,” Carl, the security guard said.

“Look Carl, I don’t have time to explain, but here’s my ID,” Seb said, getting frustrated.

Carl recognised the voice, but it didn’t match the body in front of him. Neither did the photo in the ID. “I’m sorry, but this wasn’t your ID, sir,” Carl said.

“Look Carl, you wife was off last month with laryngitis, which meant you didn’t have to hear her constant chatter, you have a pet dog called Tinkerbell and you have the same sandwich every day for lunch—plain ham,” Seb said, hoping that revealing these things might make Carl back down.

Carl gaped. “Is that really you Mr Martin?” he said.

“Yes,” Seb said. “Now can I please go to my lab?”

“Sure thing, Mr Martin, but you might want to put on a coat,” Carl said.

Looking down Seb suddenly remembered he wasn’t wearing a shirt. “It’s fine, I’ll get a coat in my lab.” Carl let Seb go on his way, staring at him all the way.

On getting to his lab, Seb found it exactly as he had left it. He started looking through all the notes he had tidied away—there was plenty here to work from, but without his computer he couldn’t put it all together. Wait, he thought, I wonder if I can get the autosave file from the main server? Rushing to the server room he checked with the IT engineer, who confirmed that a backup tape had been made, but he was just about to wipe it as they only kept them for a few days. Phew, he thought, just in time. A minute later and it would be gone. Getting a copy of his data from the engineer, he rushed back to his lab and put it in the other computer. “Fuck yeah!” he shouted to the empty lab. All the data was there. He could recreate the formula from the mutated bee. Except the mutated bee was dead, and probably in the bins outside. “Shit!”

After going through about lots of different ideas in his head, he was struck by a realisation—maybe he had the same chemical in his own body. Doing a quick blood test, he found trace elements of the chemical in his blood, but not enough to do anything with. Realising that the chemical was definitely in his body, he wondered if he could find out where it was generated from.

It was starting to get dark outside, and Gavin appeared with something to eat. “What are you working on?” he asked Seb.

“Oh, just trying to find where a chemical is being created from in my body,” Seb answered whilst eating his food.

“Have you done a blood test?,” Gavin asked. “Yep, it showed traces of the chemical but not enough for what I need,” Seb answered.

“Want some help?” Gavin asked. Seb accepted but tried to keep the end goal from his boyfriend.

Eventually they traced the chemical to an unidentified gland near Seb’s throats. Thanking Gavin for the help Seb shooed him out and said that he would see him in the morning. Gavin, suspicious but tired, decided to just play along and headed home for the night. Seb now had a conundrum—how to access the chemical. He had already worked out, from his own studies, that he no longer needed the other parts of the formula as the chemical itself, once introduced to the host, would begin the transformation process. He just needed a delivery system, and he wasn’t that keen on sticking a great big needle in his neck.

However, being one of the brightest minds in the genetics world gave him a few ideas, all of which would definitely not pass an Ethics Committee test. Remembering that they had some Cone Snails in his lab from another study he was doing, he wondered if there might be a way to splice their genetic code on to his to give him some sort of delivery system based on how they injected their venom. Realising it was a ridiculous notion, he almost gave up, until he realised he could actually use the formula to deliver this change. Laughing maniacally like a mad scientist, Seb decided to play God with himself. He created the formula using the Snail DNA and drank it, before blanking out and collapsing—again…

Coming to a few hours later, with the sunrise coming through the window, Seb looked himself up and down. No obvious changes, he thought, although my throats are sore—ha, that’s still weird to think about having throats, plural… It felt like he had something stuck in his throats, without it causing and discomfort. Trying to cough whatever it was up didn’t seem to help, although he could feel it move a little. Wait. I just moved it myself, he thought. He hovered his upper body over to the mirror to get a better look at his throats and tried to move the objects again. This time they responded and started extending up his throats. Eventually he saw two long yellow tongue-like appendages coming out of his mouths. As they came out, he touched them with his hands and realised each had a sharp object in the tip. Then he remembered—Cone Snails inject their venom from a proboscis with needle-like harpoon at the end.

Rushing over to his desk, he tried pushing one of the harpoons out. It shot out the end of his lower proboscis with a shock, then dripped a liquid out. Not wanting to miss this opportunity he collected some then tried retracting both proboscises so he could close his mouths. Running some tests his mouths both turned in to Cheshire cat smiles as he realised that he could generate enough of the chemical to cause a transformation…

Spotting Gavin coming in to work, he rushed out and grabbed him and told him they needed to go to his house—now! Gavin obeyed, but questioned Seb all the way. “You’ll find out when we get there,” Seb just kept saying, his smiles not subsiding one bit.

Rushing through the door—and almost taking it off its hinges—Seb lifted Gavin to the bedroom and started stripping him. “Hey, c’mon, you’re really going to have to explain this,” Gavin protested.

“Trust me. You’ll want to be naked for this next bit,” Seb said before pulling the now naked Gavin in for a kiss. As they were kissing Gavin feels something slide down his throat, followed by a sharp pain in his chest. The last thing he heard before he blacks out is Seb’s voice saying “I love you…”

Waking up in bed with the worst headache he had ever had, Gavin looked around for his glasses. Putting them on he saw Seb staring at him, smiling like a cat in a cream factory. “Aaaaah,” Gavin groaned.

However, something sounded different. Wait a minute, Gavin thought, something feels different too “What’s with the big cheesy grins,” he asked Seb, but his voice definitely sounded different, multiplied in fact.

“Oh, you’ll soon realise,” Seb just said, bursting with excitement.

Gavin looked over to the bedroom mirror and saw one of the hottest guys he’d ever seen. Who is that hunk? he thought, before remembering it was a mirror he was looking in. Suddenly taking in his new body, he started feeling his face with his hands. “I have two mouths,” he said out loud, in stereo. “Like really, I have two mouths,” he said looking over to Sebastian.

“Oh that’s not all,” Sebastian teased.

Trying to stand up, Gavin found some difficulty in getting his legs out from underneath the covers of the bed. He put his feet down on the floor, right foot first then left foot—then another left foot, and another right foot. “What the…!” he said.

Slowly standing up and allowing the covers to fall away, he noticed that he had four legs connected to his body—his two original legs and another pair of legs behind those, extending out and giving him a taut bubble butt in rear. Then he noticed his cock—or should that be cocks. “Fuck,” he shouts, “I have two cocks! Oh they’re big ones too.”

“Em, Earth to Gavin,” Seb said, “you might want to check in back too.”

Holy shit!” Gavin almost shouts the ceiling down, “I have four cocks!.”..

After checking out his new hot body, Gavin realised that he was also taller than he used to be.

“I don’t know how to ever thank you enough Seb,” Gavin said.

“Oh, I can think of a few ways,” Seb said, lifting Gavin back onto the bed…

Sebastian came home from work. It had been yet another boring day in the lab, with everyone still being cautious around him. It had been three months since he had transformed from a timid little guy into a 17-foot tall multi stud, but still his co-workers couldn’t seem to get used to him. Although they were being the same with Gavin, the boytaur didn’t seem to notice as much as Seb did. Speaking of Gavin…

Thud thud thud “Ugh… ugh… ugh… fuck… yeah…” thud thud

Yep, thought Seb, he’s at it again…

Seb’s transformation had given him a special, and, as far as he was aware, unique ability to force a transformation in others. Naturally the first person he tried this out on was his best friend Gavin, now his boyfriend. Gavin had undergone some transformations that were similar to Seb’s, gaining an extra mouth, but had also taken a different turn by growing an extra pair of legs and an extra 3 cocks. These, combined with his now quadrupled anuses, seemed to give Gavin a sex-drive like no other. At first, Seb enjoyed this as it gave him an opportunity to really try out his body, but after a fortnight even he was beginning to tire.

Gavin just seemed to have endless energy. He only needed 90 minutes sleep each day and was active for most of the rest. Seb, despite his best efforts, just couldn’t keep up. So, they came up with a compromise that suited them both—Gavin could invite some norm guys round for sex each day to wear down his sex-drive, but whilst he had sex with those guys, he would make love to Seb as the two poured out their devotion to each other in ways that no norm could ever hope to achieve.

And so it was that the noise of Gavin’s sex came to a climax and the familiar rhythm of his four feet started bounding down the stairs in their new, shared house. Strolling in to the living room, completely naked, Gavin spotted the love of his life and bounds over to him.

“Hey you,” Gavin said to Seb, sharing a four mouthed kiss between them. “How was work?”

“Oh, not bad. Everyone still avoiding me, and I’m not getting any new assignments,” Seb said sullenly.

“Huh, me too. Nothing seems to be coming my way at work, so I’ve applied for something new.”

“Really? What is it?”

“Well, it’s actually a job in town that I’m more than qualified for—Doctor MacNeill is looking for a new junior to join his practice.”

“Ha. You a GP?”

“Hey, I am Doctor Gavin Fry you know, I just went into Biosciences instead of Medicine. Anyway, I think that with the amount of multis in town that Doc MacNeill could use someone like me.”

“Well, you’re probably right,” Seb said. Hearing a moan coming from upstairs, he asked, “So, how many?”

“How many what?” Gavin replied, looking confused until the penny dropped. “Oh, only 10 guys today.”


“Yip. They were sooo good, and it felt great fucking four of them while sucking two of them off then having the other four fuck me afterwards. But they’re all spent, completely exhausted up there. Don’t know why, it was only two hours long today. Oh well.”

“Ten…” Seb just whispered while looking at his sex-crazy boyfriend. He looked like he hadn’t done anything at all, let alone knock out 10 guys. Seb could start feeling his own cock starting to stir…

Gavin spotted this too and licked his lips.

“You know, even after all these weeks I’ve never ever seen this thing at its biggest. How big do you reckon it gets?” he asked Seb.

“I don’t know, it usually gets hard but still keeps growing when it’s inside you.”

“Well, let’s try it out then,” Gavin said, grabbing Seb’s trousers and pulling them off.

He whistles from both mouths as he sees Seb’s trouser-snake starting to get hard. Even soft, it was bigger than any of the norms’ cocks upstairs, and Gavin had a good idea that it was one of the biggest in town. Acting on impulse, he started grabbing Seb’s cock in his strong hands, rubbing it sensually as it started to get bigger and bigger. Eventually, he started to feel it getting harder and harder. Looking at Seb’s face beside his, Seb had his eyes closed with the waves of pleasure Gavin was causing him.

As it started to reach what felt like full length, one of the norms from upstairs came in, cum still dripping from his ass.

“Holy shit!” he said, seeing the flesh-coloured serpent in front of him.

“Hey,” Gavin said to him, “do me a favour and lie down on the floor next to this.” The man complied. “Tell me, how tall are you?” Gavin asked him.

“I’m six foot one.”

“Ha! Seb! Your cock is over six foot long when it’s hard. In fact, I think it’s actually longer than this guy here!” Gavin is almost jumping with joy.

Turning swiftly, he presented one of his rear anuses and started feeding Seb’s man-high cock into it. Gavin easily took the top two feet of the cock and started humping it like mad.

“Oh fuck… oh… oh… oh… fuck… oh…” he moaned, his voice getting higher with each push. Seb just manoeuvred his long body so that he could kiss Gavin, using his long two tongues to throat-fuck his boyfriend. After a few minutes of this entirely new experience, Seb released his load into his boyfriend, who came all over the floor from his own four monster cocks.

Exhausted himself from a day of work, and some unexpected sex, Seb collapsed in a heap on both of the sofas. Gavin on the other hand still had lost no energy.

“Hey, c’mon big guy. No time for napping. We’ve got to get ready. Remember we’re going down to the pub with some of the guys to welcome some old multis back to town? Danny said he’s bringing them over about 8 p.m. so let’s get a move on.”

Seb just groaned as Gavin darted to the shower to get washed. The norm that had been used as a tape measure was snoring soundly on the floor. You know, thought Seb, that looks a good idea as his eyes closed and he entered sleepyland…

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