Hooked up

by Growthbeast

A guy invites his friend over to test a machine that fuels his fantasy, but neither could have predicted how it would turn out in the end.

Chris had just finished working a revolutionary transformation machine, and after seeing some tests, he wanted to try it on a friend of his that he thought would be up for the job. That friend was Peppino, a guy in his 30s who looked like he could be way older, like Chris’s more middle-aged dad kind of age. Chris had looked through Peppino’s phone and knew just exactly what he was into, and the machine could perfectly replicate that.

Peppino was knocking at the entrance and Chris knew it was go time.

“Pino my guy! You ready? This is going to change so much and I know you’re just gonna love it!”

Peppino was surprised to see such a huge machine in front of him in Chris’s lab.

“You sure? Well, let’s, uh, test this thing out then, shall we? Also, are you... supposed to be wearing that?” Chris was shirtless, just wearing everything below the waist.

“Oh, this would actually involve fewer clothes, if you’re chill with that,” Chris explained. Pulling out his belt, he let his pants dropping to the floor, his chubby body in tighty-whities now revealed to his friend.

“Well, if you insist! You know, wearing only underwear around the house is normally what I do on a daily basis!” Peppino chuckled and began to undress.

Chris stopped him partway through. “You should probably wear mine. You know, science stuff...” and he began to take off his tighty-whities, handing them to Peppino for him to wear. Meanwhile Chris put on his own specific pair of tighty-whities, ones built for the machine’s power.

Peppino couldn’t help but start getting hard. He had fantasized about wearing Chris’s undies in front of him for years! His fantasy was becoming real!

Chris started to press a bunch of buttons and flick levers on the machine, stuff Peppino couldn’t grasp. He wasn’t built for this science stuff. “Now Pino, get in here!”

Peppino stepped up into the machine and his wrists were cuffed to a huge metal ring around him, and his ankles soon followed, making him form an X shape across the machine.

“Woah! Easy there!” Peppino felt Chris place one end of a long tube into Peppino’s ass. “Feels good though!”

Chris was glad, “Seems you’re all excited too, look at that thing!” he said while rubbing Peppino’s rock-hard bulge. He carried the tube to a connector within the machine, and a larger tube from there that he put onto the end of his dick. Chris had already crafted a serum full of his DNA that he would use on Peppino, and that was one of many tubes involved. Chris then popped on a penis pump to his cock and hooked it up to the system of tubes all heading into Peppino, one to his ear, one to his cock, one to his ass, and one to his nipple.

Both men were excited to start. With a push of a button, the machine started to begin the process. Chris got immediately hard, his vibrating buttplug getting him hornier and hornier.

Two syringe-ended tubes filled with transformation sera were slowly extending from the machine over to Peppino and Chris. The one aimed at Chris went straight into his ass. The one meant for Peppino went first to Chris and extracted some sperm from Chris, then it slowly got carried to Peppino where the cum-mixed serum went right through the syringe and into Peppino’s gut.

Peppino couldn’t believe what was happening. He was in his crush’s underwear and a bit of his cum just got injected into him.

Countless rings that made up the outer regions of the machine started to spin, and the transformation was now in full swing. Chris thought he could feel his testosterone multiplying. His skin felt tight, but it was as if it was instantly growing even more skin all over to accommodate more of him! He was getting bigger, but not fatter. His shoulders were actually getting more defined, and he watched as his fat just faded from his arms, muscular biceps growing in their place. Chris’s goatee soon grew into a luscious beard, gaining back the dark hair colour from his youth.

“More!” he shouted, watching Peppino get incredibly horny at Chris’s muscles growing. Chris was vibrating from pleasure, his cum intensifying inside his balls. Each ounce of fat that was receding was getting churned into fresh cum, and Chris started to growl as his cock started flowing out cum.

Peppino watched as Chris’s cum flowed through the tube and soon it reached his ass. “MMmmMm!! Feels so.....warm and nice......”

Chris’s transformation was getting even more intense. His body was growing in height and his muscles growing bigger and bigger! His biceps were now 200% of what they were before, and his body jolted forward as his dad-tits burst out into muscle-god pecs. Though he would still be 56 years old, Chris could feel himself grow physically younger. He shook his gut up and down, watching it shrink down and then burst into a pair of six-pack abs... His almost inhuman testosterone count shifted his body to create more... He went from six-pack to eight-pack as he kept growing taller! Ten pack! Twelve-pack abs!!

He flexed his muscles as he saw them grow in real time. To think mere minutes ago he was rocking a full fat dad bod! Every second felt so pleasurable as his fat-turned-cum got transferred into Peppino, and he watched how Peppino’s DNA was slowly being reconstructed. Peppino didn’t realize it but he was getting turned into what Chris had looked like before he went into the machine, only adding it to Peppino’s younger fat cub bod.

Peppino was already moaning, watching his belly grow, feeling his very DNA get torn apart and pushed together. “Ya like that buddy?” Chris yelled, his body now four times as big as it was before, all the fat now getting shoved into Peppino. Peppino saw his own arms and legs grow longer and fatter...and his mind went blurry. If he was half of his DNA and half of Chris’s DNA, that could only mean... he was now...

Peppino had finally realized. His fantasy was becoming even more of a true reality!

“Fuckkkkk yes, dad!!” he yelled. “Chris, are you turning me into your biological son?”

Chris’s entire body felt itself get hard like his cock. Peppino and Chris were thinking the same thing. Chris had started bursting out cum from his nipples and cock, as the tubes going into Peppino filled him up fatter and fatter as he turned more into Chris. His already balding head was clearing all of his hair off, matching Chris’s bald head, although Chris had chosen to go bald while Peppino was naturally balding. Even his body hair was all gone, with his mustache forming into Chris’s old goatee. The goatee made him feel older... Way older... It was like he was Chris’s son, but the same age as Chris.

Peppino was now 56 in age while Chris had shrunk his age down to be more like 40. By now, both men were huge. Chris was a muscle beast that was now almost as big as the machine is tall, he was now 20 feet tall and Peppino was now at 14 feet tall. Chris had programmed the machine to halt at this point, and he ripped off all his tubes from himself and Peppino and saw Peppino’s old underwear in comparison to the machine-specific underwear that grew with the two men.

“Ha, it’s fuckin tiny now! Now son... Peppino... go on... Say it. You know you want to.”

Peppino turned himself around and yelled, “Breed me, dad!” and Chris immediately jolted his massive goliath cock into the man. It immediately went to bulge out the other side of Peppino, Chris’s cock stretching out Peppino’s belly. Chris fucked him and destroyed his hole in a matter of seconds... But the cacophony of moans and grunts was enough to keep him going...

He felt another power deep inside him, and he channelled his energy into his finger and shoved it deep inside Peppino’s throat... He felt his finger change and Peppino soon felt a familiar shape inside his mouth. Chris looked at his finger and saw that he had turned it into a huge penis finger! He knew what he had to do to Peppino. He used his huge fingers to set up an old machine. Just a press of a huge button and a helmet attached to wires on the ceiling was charged up.

Chris boomed, “I never thought I would use this, but we both know you want it.”

Peppino shoved his head into the helmet and his body vibrated even more, pleasuring Chris’s dick. Chris used his new powers to turn his nipples into long pec cocks, something he’d always fantasized about.

Electric shocks of lightning surrounded Peppino’s head, as he felt his bald head growing longer and taller. His brain felt like it was... Melting? Chris observed the transformation but still with Peppino’s belly and ass harbouring his cock. Peppino felt as his brain kept melting, he kept getting dumber and dumber, more mindless. Part of him didn’t want this, but his cock was telling him he needed it and his cock soon took full control.

As Chris took off his helmet gadget off of Peppino, revealing he had turned him into a mindless freak! The top of Peppino’s head had turned into a huge penis head! His brain turned into cum and Chris saw his son turn into a full permanent gooner.

“Hehe. He’s just like his dad. Part penis, part man.” Chris used his new penis abilities and turned Peppino’s arms and nipples into penises. He was able to shrink down Peppino a little bit and slowly after turning parts of Peppino to cocks and shrinking him, he knew what had to be done. Peppino deep down knew what was about to happen and his penis in charge was so excited.

Chris placed Peppino right next to his cock, and felt his DNA in his body bond with his DNA in Peppino’s body and Peppino’s penis body all started to merge until Peppino was nothing but another one of Chris’s cocks.

Chris had turned himself into a huge muscle freak and his warehouse wasn’t enough. Chris drank his spare barrel of pure serum he had for backup, and he got bigger and bigger, bulkier and bulkier, until he burst out of his warehouse. He walked his giant body to a nuclear power plant, went into the nuclear coolers, and his body started to glow green, his cocks growing longer and himself growing more nonhuman features, like a long penis tail and horns out of his bald head. He flexed and absorbed all power from around him, making him 40 feet, 60 feet, 80 feet, 100 feet tall, and still hungry for more. The original Chris was just a fraction of the monster he turned himself into.

He felt his cocks all sync up and he roared, causing a mini earthquake around him as his voice boomed and his cocks all erupted with cum, even the cock that Peppino had turned into. Chris was now a true monster. No bit of humanity left inside him. The only sounds he could make were grunts and moans, roars and growls. His eyes were glowing, and his face started shifting, his jaw turning into a muzzle, teeth sharpening, and fingers growing into cocks. A true beast. A freak. A goliath. A god. A demon. Nobody knew what he turned into but he was a true monster and he fuckin’ loved it.

Vote on this story

The best instructions are those that are clearly stated by Ziel Marty talks his super smart friend into whipping him up a special potion that will help with his little problem. 5,194 words Added Jun 2016 26k views 5.0 stars (11 votes) No comments yet •Cock Growth•Huge Balls•Huge Cock•Hyper Cock•Hyper Cum•Infectious •M/M

The box by BRK Steve gets a box of clothes from his mysterious and beautiful brother, Peter, and it turns out the clothes have an amazing effect on his already unusual body. 8 parts 30k words Added Dec 2002 Updated 7 Sep 2019 36k views 5.0 stars (14 votes) No comments yet •Cock Growth•Huge Cock•Public Orgasm•Extra digits•Multicock•Multihead•Four Legs•Multiarm•Multileg•Multilimb•Replication•Muscle Growth•Stretchy•Getting Handsomer•Getting Taller•First Time/Virgin•Incest•Brothers•Selfcest•Witch/Warlock/Wizard •M/M•M/M/M•M/M/M/...

Stuff in the cellar by Charles Westfall Richard is already good-looking and abnormally hung when he discovers some alien equipment in the cellar of his new house—including a vat of goo that transforms him into someone even hotter and more hung. And there’s no way Richard’s keeping his new gifts to himself. 4 parts 15k words Added Jul 2002 28k views 5.0 stars (10 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cum•Muscle Growth•Muscle/Strength•Pointy Ears•Size Increase •t/t•t/t/t

The trainer by Also Known As Needing a new trainer, Thomas finds onewho can push him to the next level, and then some. 7 parts 22k words Added Jan 2014 30k views 5.0 stars (15 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Muscle Growth•Muscle/Strength•Size Increase •M/M

Transform: Phone sex by Also Known As Converting a guy to be one of the Transformed is easy enough in person. But what about over the phone? 5,573 words Added Jan 2014 17k views 5.0 stars (8 votes) No comments yet •Cock Growth•Huge Cock•Multicock•Muscle Growth•Muscle/Strength•Size Increase•Infectious •M/M•M/M/M

Twinning: The college years by BRK At college, Will attracts the attention of a sexy, Irish hockey player who pushes all Will’s buttons—but now that he’s in this new world Will isn’t sure he can share all of himself with his slowly growing admirer. 8 parts 37k words Added Mar 2017 Updated 9 Oct 2021 31k views 5.0 stars (11 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Hyper Cock•Self-suck•Extra digits•Multi-abs•Multicock•Multitongue•Replication•Muscle Growth•Muscle/Strength•Always Shirtless•Getting Taller•Size Increase•Tongue Growth•Selfcest•St. Patrick’s Day •M/M•M/M/M/...

Dragon’s Horde: Drunk on the groove by STrRedWolf A local DJ and neighbor of Red's overdoes it at the Dragon's Horde... and the next day, he's feeling rather green... and rather hung. 1,573 words Added Mar 2017 11k views 5.0 stars (2 votes) No comments yet •Cock Growth•Huge Balls•Hyper Cock•Multi-balls•Multiarm•Anthro/Furry•Alcohol

Santa’s big surprise: Family visit by Silverfox Dad Muscle studs Jeremy and Marco are incredibly happy together thanks to Santa’s gift the year before, and with their stunning physiques they have money and fans and everything they could need. Now, if only their families weren’t coming for Christmas… 2 parts 6,719 words Added Dec 2018 12k views 5.0 stars (6 votes) No comments yet •Cock Growth•Huge Cock•Muscle Growth•Muscle/Strength•Age Difference•Seniors•Christmas •M/M