Chapter 1

Mike was always a skinny kid. He took forever to even reach puberty and even then he was left with little to prove it. He stood at a mere 5’6 with a puny frame. Even his dick was puny, measuring in at only 4 inches hard. He had tried working out numerous times but no amount of time in the gym and protein shakes did the trick. At the age of 22, he hadn’t even tried to purchase alcohol, dreading the exchange and the likely fact they would assume he was a child. He had no friends, save for the handful he would chat with online every now and then. Well, he did have Cody. Cody was his roommate, a guy who was kind and friendly from the moment Mike moved in a year ago. The two had made fast friends which would have been great if it wasn’t for one horrible detail. Cody was crazy hot. Standing at 5’11 with a muscular build, he had short brown hair and sexy stubble on his face. A treasure trail led from his belly button down to his evident bulge. He would always come back from the gym soaked in sweat, giving off a musk that made Mike go hard instantly. When it got late and neared Cody’s bedtime he would always walk around the common area in too small band shirts that made him look even beefier than he already was as well as tight little boxer briefs that made his cock bulge obscenely. It was almost like he knew of Mike’s plight and was teasing him for it. Mike had never seen any evidence of Cody being gay but he never saw him go on any sort of date with any women either so not all hope was lost. Even if he was gay it wasn’t like he was going to be attracted to string bean Mike anyways. Tonight his problems had really gotten to him too as he found himself lying in bed on the brink of crying. Then he heard his doorknob turning. Cody opened the door and leaned his body into the room.

“Hey Mike, I was making ramen but I made a little too much, you want any dude?”

He seemed to notice Mike’s bad mood “What’s got you down?”

Mike thought about lying, saying it was a bad day at work or something. In the moment though he felt like telling the truth, well half of it.

“I’m just so sick of being so fucking skinny!” It sounded so pathetic saying it out loud.

“Aw Mike I’m sorry man, you could start coming to the gym with me if you wanted?”

“I’ve tried working out before but it never does anything! No amount of lifting or dieting ever makes any sort of difference!”

Cody was quiet for a moment, clearly thinking.

“Mike, do you know where I work?”

Mike looked at him confused. What did Cody’s job have to do with his life?

“I don’t know, isn’t it someplace outside of town?”

“Well yeah but it’s this company called JOCKSLUT. I know that sounds weird but they’ve been experimenting, trying to make products that can modify people”

Mike sat up next to Cody, “what do you mean by modify?‘’

Cody seemed unsure of how to answer that. “Well they make stuff that changes people, I’ll leave it at that. They’ve been working on a new formula that can significantly increase muscle mass. I’m just the receptionist so I don’t know all the details but from what I’ve heard in passing it’s pretty much complete.”

“Cody, I appreciate it but that’s just too good to be true”

“No seriously dude I’ve seen the other products work first hand! They were testing this drug that makes people umm…well very horny and makes their butts swell up real big. Saw this big muscular dude come in and leave with one of our doctors. The dude couldn’t even form a sentence before begging somebody to fuck him.”

Mike had to admit that sounded strange and based on his hardening cock, hot too.

“Listen, in the worst case scenario it doesn’t work and nothing happens. If it works though it sounds pretty great man.”

Mike had to admit it did. “Alright, I’ll give it a go.”

Cody grinned at Mike, “you won’t regret it, dude!”

Cody turned and left the room, leaving Mike with his thoughts. Could this really work? It sounded way too good to be true. Cody was right though, worst case scenario it didn’t do anything. Best case he became the jock of his dreams. He also realized there was a chance he could turn into a slut like that other guy. His cock pulsed at the thought. Maybe that wouldn’t be too bad either. Mike went to sleep that night dreaming of his body swelling with muscle and Cody declaring his love for him before they fucked the night away.

Mike waited anxiously the whole day for Cody to return. He explained before he left that because he was just a receptionist that there was only so much he could do to try and get some of the formula. Mike just hoped he would do his best.

That evening Mike was browsing Grindr looking at all the people he would feel confident messaging soon when he nearly fell out of his seat after he heard keys in the front door. Mike rushed into the room just as Cody was closing the door behind him. He looked a little anxious. His hair was a bit tousled and some of the zippers on his backpack were left open, almost like he had to leave in a rush. When he turned to face Mike he was smiling brightly.

“I got it, dude!”

“No way, really! Was it hard to get?”

Cody’s expression wavered at his question but he still remained cheery. “No, no they gave it to me so easily I was surprised myself!”

Cody pulled out a slip of paper and a bottle of a foggy liquid. “I got this instructional slip too! So, do you wanna try it right now?”

Mike excitedly nodded and gestured for Cody to follow him into his room. Once inside Cody handed Mike the liquid. Mike inspected it, moving the viscous liquid around in the bottle. It was funny, if he didn’t know better he could have sworn this was a bottle of cum!

“So what do the instructions say?”

Cody held up the slip and began reading aloud “Subject must pour ample amount of Jock Slut Cream into their hand. Apply liberally on the nipples, butt, penis, and testicles. For the butt, apply an additional amount within and around the anus. Note it is important the subject applies to all regions as each causes a different effect. Application to all zones will produce the end result that is likely desired.”

“Wow, that’s quite the process”, exclaimed Mike.

 serve” you while you apply it, it’s part of my conditions for them giving it to me.”

Mike’s face turned beet red. Cody was going to watch Mike basically jerk off?!

Cody noticed Mike’s discomfort “It’s okay if that makes you not want to do it. I-”

“I’ll do it!” Mike shouted so suddenly it surprised both of them.

“Okay as long as you’re comfortable,” Cody said, handing over the bottle.

Mike placed the bottle and the floor and began to undress, only blushing more as his embarrassment grew. Finally, he was completely naked with Cody standing behind him. He made up his mind that it would be better to just pretend he wasn’t here. He poured a dab of the viscous liquid onto both his index fingers, deciding to go for his nipples first. He slowly brought the cold liquid to his small nipples, the icy touch of it causing them to instantly harden. He began to rub them, enjoying the sensation. He’d never noticed how sensitive his nipples were, rubbing them was already making his cock hard. He was once again glad he was facing away from Cody. As he continued to rub his nipples he began to notice they seemed to be getting more sensitive, he assumed it was just because of his hardening cock. Still, they continued to become more and more sensitive until it almost felt better than jacking off. He looked down at his nipples suddenly realizing they had grown. Not just in diameter but they had swelled too. The combination of looking at his swelling nipples and their overpowering sensation brought him to his knees. He suddenly realized just how horny he was, he couldn’t remember a time when he’d ever felt like this.

He began to feel a warmth radiating out from his nipples. He looked down at the solid slabs of bone, where anyone else would have pecs, and realized they looked like they were growing. No, they didn’t look like they were growing, they were growing. He watched as they swelled with muscle. He began to notice the heat continuing to move further through his body, reaching his arms and torso. He watched in amazement as his inexistent arms inflated with muscle. He did a double bicep pose and watched as his arms swelled into mountains of muscle. He felt his back grow pounds of muscle too as he drew his eyes down to his flat stomach. Abs grew rapidly before his eyes, popping into place, giving him the ripped washboard abs an Instagram model would envy. He felt the heat move through the rest of his body next. His thighs swelled with strength. They grew to be big enough that he was sure if he had not taken off his shorts they would have ripped to shreds. His ass inflated too, becoming tight and muscular. He felt the warmth on his face too, reaching up to find his face rearranging into a chiseled jock complexion. He began to feel an itchy sensation as well, finding he now had the sexy stubble he so often found himself admiring on other guys on his own sexy mug. He was so enamored by his body he didn’t even notice the heat creeping into his mind in the form of a heavy fog that slowed his thoughts. He let out a dumb chuckle at the bubbly, horny feeling that washed over him. He stood, stumbling at his newfound weight and strength, quickly noticing how much closer he was to the ceiling. In his kneeling position, he hadn’t realized his legs had grown not only in girth but in length. He was now 6’1, even taller than Cody!

 turned around quickly, suddenly remembering Cody was in the room with him. He was shocked to find him naked with his cock out, hard and leaking.

“I, uh” stammered Cody

Did that mean that Cody was- “Cody you’re gay?!”

Cody sighed at this realization, quickly composing himself. “Yeah man I’m gay, you know I’ve always thought you were cute, dude. I just needed you to have a little more meat on your bones.”

Mike could understand that last part’s reasoning. He was more excited that Cody actually liked him. The transformation had left him feeling impossibly horny and in his horny stupor, he had an idea.

“Well with that in mind I could really use some help applying this to my ass.” Mike held up the bottle, gesturing to his new muscle butt with his free hand.

Cody practically licked his lips, “I’d be happy to”

Mike handed over the bottle before laying down on the bed with his ass up and legs hanging over. Cody proceeded to pour a hearty amount of the cream into his hands and began rubbing up Mike’s ass.

“Man I had no idea you were going to turn out this hot! I don’t even know what they meant by the formula being too “volatile”, you look perfect to me so far. Must just be some silly scientist talk. Fuck, this was totally worth steali-” he stopped, realizing he had said too much.

Mike felt like he should have been surprised at something Cody said but whatever it was he didn’t care. Cody’s hands just felt so amazing on his ass. It almost felt like his ass was getting more sensitive as he continued! He began to feel that heat well up in his ass again. This time it almost felt like it was inflating!

Cody was surprised to find it was in fact inflating. He felt the solid muscle butt begin to swell with fat on top of the muscle, becoming thick and bouncy. He began to pry apart the bubbly cheeks, making his way towards Mike’s pink hole. As he worked closer, Mike began to feel moans welling up inside him. He finally couldn’t hold back when he felt Cody slip one of his fingers into his hole, letting out a loud moan. Cody continued to work his fingers inside Mike’s hole as it stretched to accommodate more. He took his fingers out for a moment, to the disappointment of Mike, only to pour more Jock Slut Cream directly into his gaping jock pussy. He forced his fingers inside again, to the relief of Mike, thoroughly coating the inside of Mike’s ass. He was surprised when it seemed to be getting more slippery as if Mikey’s jock pussy was beginning to lubricate itself. He then remembered hearing that was one of the effects of the cream, meaning Mikey now had a bonafide jock pussy.

ing them to start growing.

Cody continued to finger fuck Mikey’s jock pussy as it oozed out a mixture of Jock Slut Cream and his jock pussy’s new self-lubrication cum. Cody began licking up the excess pouring out, driving Mikey wild. Mikey wanted to see his sexy bro that was fucking him so he flipped over on his back to get a better view. He nearly came instantly when he saw Cody’s already respectable frame swelling with muscle on top of what was already there turning him into Mikey’s wet dream. It made him even hornier to see Cody feeling up his pecs and rubbing his swollen nipples as he admired Mikey’s new sexy body. They simply stared at each other for a moment in horny bliss. Two godly muscle jocks, ripe for fucking. Mikey was the first to break the stare, lunging for Cody’s cock and slurping the whole 7 inches. Cody let out a deep moan continuing to play with his sensitive nips.

“Fuck you’re so hot Mikey”, Cody grunted out.

Mikey only moaned around Cody’s fuck stick in response.

Mikey reached for the bottle of Jock Slut Cream that was thrown aside and poured a handful while Cody was none the wiser oblivious to anything but how good his body felt. He took both hands and grabbed Cody’s muscle butt which wasted no time swelling under his touch. He slipped his fingers into his soon to be jock pussy, wasting no time coating his insides. Cody felt like something was wrong like he shouldn’t let his bro coat him in Jock Slut Cream for some reason. Whatever it was, it wasn’t as important as Mikey’s warm, lubed fingers assaulting his prostate. It was almost too much when Mikey took his hands out of his jock pussy and began fondling his balls and cock with his cream covered hand. Mikey was jerking himself off now with one hand while another played with Cody’s dick, thoroughly coating their cocks in Jock Slut Cream. They both moaned loudly when both of the cocks swelled in girth and length all the way up to 10 inches each. Their cocks managed to become even more sensitive as well driving them to the edge. They each blasted torrents of cum. Mikey hungrily licked up Cody’s jock cream, desperate not to let a single drop go to waste. The Jock Slut Cream coating their cocks began to drip down, coating each of their balls. Their balls began to change too, swelling to kiwi sized and instantly filling back up with potent jock cum. The two newly transformed jock bros eyed up each other’s sexy tanned bodies, shining with sex sweat. Cody moved closer to Mikey before pulling him into a kiss. The two explored each other’s mouths, rubbing their stubble together. Their hands explored the other’s godly body, squeezing each swollen muscle. Their hands settled on their swollen nipples, rubbing and squeezing so much they had to break their kiss because of their moans.

Mikey eagerly grabbed Cody’s new bouncy bubble butt, squeezing it like a stress ball. “Lemme take that new jock pussy for a spin bro”

“Yeah bro you wanna fuck this jock pussy?” Cody said, grinning madly.

Mikey grabbed Cody and threw him onto the bed. He stuck his bubble butt into the air, exposing his pulsating himbo hole, ready to be bred. Mikey reared his new 10 inch jock cock and railed Cody, mashing his boy button and causing him to cry out in horny ecstasy. Mikey continued breeding Cody, their moans echoing through the small apartment. Finally, they neared the edge.

“I’m gonna cum bro!” Mikey cried out.

“Fuck bro, me too!”

“Let’s do it together dude!”

With that Mikey’s cock spasmed, flooding Cody’s jock pussy with hot and sticky jock cum, causing Cody to spray his load all over the bedsheets.

“I love you bro” moaned Cody. “I love you too bro,” Mikey said, pulling his new jock boyfriend in a tight embrace, his dick still inside his cream filled hole.

The two jocks shared their horny bliss, completely unaware of Cody’s phone ringing on the bed next to him. The caller ID read “JOCKSLUT CORP”.

Dr.Baer had no luck contacting Cody, he guessed it was already too late. He’d tried to tell him the cream was too potent but he wouldn’t listen, stealing it for himself. At least he had two horny jock sluts to pick up and add to his rapidly growing menagerie of toys. He grinned, this was definitely a net gain. Besides, he still had his other experimental cream and it was almost ready…