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22 minutes ago, richard18 said:

cant wait for more and to see what happens to jayden's semen filled belly, will he get muscular himself 

Only time will tell! I might continue this, if people want more.

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26 minutes ago, richard18 said:

cant wait for more and to see what happens to jayden's semen filled belly, will he get muscular himself 

Yes let’s hope that muscle seed turns him into a beast 

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That part with swollen belly is great. It's just a pity you didn't describe in more detail, I mean what he felt etc. Anyway it's a very good story :) Can't wait to read a next part.

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Chapter 2: Sibling Rivalry

The rest of the previous day had passed by, like a blur. Jayden didn't remember a whole lot, but when he came to, he was dizzy. He grinned stupidly, still drunk off of the musk of the other men. He sat up, rubbing his head. The scent of manly musk and sex hung on the air about him. It was definitely a smell he could get used to. He rested back a little bit, resting a hand on his swollen middle. He groaned in pleasure at how sensitive it felt. It seemed slightly larger than what he remembered. No doubt he had some more fun before he came home. Not that he minded. He enjoyed the sight of it, and it made him feel wanted. The young man showered shortly after, got dressed in his uniform, his gut pushing up his shirt, and headed back to work. He said good morning to Adam, and headed in. It was quiet in the gym this morning. There must've been four guys here, working out. Jayden didn't mind though. He went about his morning, asking if any of the men needed help, but found that they didn't. So, he decided to try working out. Laying back on a bench, he went for a lighter set of weights, which he began lifting effortlessly. He wanted to break his previous record of 30 lifts. He slowly did it, but his gut felt strange, and a strange, throbbing sensation travelled all over his body. But it didn't make him stop. If anything, it made him want to keep going. Soon after hitting his goal, he sat up, exhaling happily at his work out.
"Jayden! We've got a couple new sign-ups for the gym! Could you come and show them around?"
Adam's voice came over the intercom, sounding really smooth. Jayden grinned, thinking about Adam and that bubble butt of his, before getting to his feet. He felt lighter, for some reason, but he ignored this to head to the entrance. What he found there, with Adam, was a delicious sight. Standing behind Adam were twins. Identical twins, though, one seemed slightly taller, while the other seemed to be more muscular. And they were both handsome. The tallest was around 6'5", and the other only a couple inches shorter. The largest was packed with muscles. He wasn't as big as Phil was, but he definitely had some size to him, and the other wasn't that far behind him. They had fair hair, messy on both of them, and they had stunning green eyes. Each boasted a trimmed beard. What stood out to Jayden was their huge pecs. They were larger than they should be, showing that they focused on their chests. Jayden would smirk a little, before nodding his head at them.
"Jayden, this is Rhys and Caleb. Twins. If you'd please show them around, and tell them what you do here, that'd be much appreciated."
Adam smiled, stroking Jayden's arm gently. Jayden shivered, wanting to kiss this man on the lips, before turning to the twins with a wide grin.
"If you'd both follow me, please."
The twins nodded. Jayden led them on a tour of the facility, starting with the workout area, then the sauna, the pool, and then the kitchen. He led them to the toilet block - which he discovered had glory holes - and then finally to the lockers and shower room. He turned to face them, giving them a couple of locker keys, beside each other. The twins looked over him.
"So, uh, what is it you do here, Jayden?"
Jayden smiled, blushing slightly. He was still getting used to his title here. But, nevertheless, he leaned against the lockers, trying to play it cool. 
"Towel Boy and Escort. Basically, I wipe down sweaty guys. And, if they really need it, my ass and mouth are available."
He made himself sound like a slut. He thought how stupid that sounded, before the twins looked at each other with mischievous grins. Each of them placed a hand on one of his shoulders. They moved closer to the young man, blocking his getaway. He looked up at them shyly, still not really used to the height difference. However, the strange thing was, looking over them, he felt like he was almost the same height as the smaller one, who was about 6'3". He could've sworn he was 6 foot even, but he may have measured wrong. He shook his head, returning to reality, when he noticed the twins had shed their shirts, and were feeling up each other's pecs. Rhys, the taller of the pair, grinned. The twins moaned out in pleasure.
"Well, Jayden, me and my brother here like to...enjoy each other. There have been times where we've slept together. And, we always enjoy a good threesome. However, he and I have a little rivalry going on."
"That's right, little guy. We need an outside source to help us decide. I'm Caleb, my bro here is Rhys. See if you can remember that."
Caleb, the shorter, but more muscular twin, pulled Jayden to him, trapping the young man's head between his hefty pecs, kissing his lips gently, and groping the towel boy's ass. He broke the kiss.
"We need you to decide, Jayden. Who's the tallest? The strongest?"
He would look to Rhys, grinning, and Rhys would grin back, getting behind Jayden, pressing his pecs to his brother's pecs.
"Who has the biggest tits? The biggest dick? The biggest balls?"
Caleb would grope his brother's pecs, using his thumbs to tease his nipples.
"And who can cum the most? These are all questions for you, little Jayden. Of course, no matter your answers, you're going to be fucked."
Jayden was in heaven. He always had fantasies about twins, and this job just seemed to provide this for him. He decided to judge this...by helping the twins out of their clothes, then taking off his own, leaving the three naked. He would look over them, and stroke his hand up Rhys' side, enjoying the feeling of this tan skinned stud's skin. He then ran his hand over Caleb's shoulder, and down his arm, squeezing the bicep, before resting a hand on each of their hips. He grinned, feeling the twins dicks rock hard against his sensitive, round gut.
"Rhys is taller, but only by a couple inches. Caleb is stronger, but he maybe has 10 pounds on Rhys." 
He reached up, and bounced Rhys' pecs in his hands. He would weigh them, before sucking on one of his nipples, stroking over them, and making the taller twin moan out, stroking behind Jayden's head. Jayden slowly pulled away, a spit trail connecting his mouth to that nipple, before moving to Caleb's pecs. He would bounce them in his hands, and suckle on the noticeably thicker nipple, the stronger twin moaning in delight, as he gripped Jayden's ass. He pulled away, and kissed each of their pecs, licking each nipple. 
"Rhys' feel heavier, but Caleb has thicker, more mouth watering nipples. Both fantastic pairs of tits though, guys."
The twins chuckled, holding a hand around each other's hips, kissing each other softly, as Jayden got on his knees, and would stroke each of their cocks. Looking at them at full mast, he could determine who was bigger. He pulled them together, comparing them side by side, then one on top of the other. The shorter one was Rhys', who's dick must've been 18 inches. Caleb's was easily about 22 inches. Rhys easily had the bigger balls, being grapefruits, and Caleb easily had large apple sized balls.
"Fuckk...so huge. Rhys, yours is shorter, but thicker. Caleb, yours is longer, but thinner. And Rhys has the bigger balls. Fuck, you guys are hot."
The twins smirked, before Caleb easily lifted Jayden up, and pushed his cock into Jayden's eagerly awaiting hole. Rhys approached from the front, and pushed his cock into the smaller male's mouth. Jayden easily took about 7 inches of this cock into his mouth, feeling more confident than last time, with Phil. He got rock hard, being spitroasted by hot twins. He would bob his head on Rhys' dick, as the twins thrusted in and out from both ends. They leaned over, and would kiss each other, their pecs pressed firmly together. Jayden could only imagine what being a muscle beast like this was like. He closed his eyes, and imagined himself, as big as Phil, laying on his back, with several smaller guys going at his ass and mouth. He grinned stupidly, forgetting where he was almost. He looked up at Rhys with a grin, and ran his tongue down the side of the thick, mouth stretching cock.
"Mmm, bro, this guy is super eager. I think I'd be more than happy to keep up a gym membership here."
The twins moaned in pleasure, as their orgasms grew ever closer. Jayden was ready for it, and he wanted it really bad. Maybe he had become a real slut after working here. He definitely wasn't an alpha, by any means. And, after a few moments, the young man was not disappointed. He felt a strong spurt up his ass, and he gulped down the generous load Rhys gave him. Unlike Phil, even these combined loads didn't swell Jayden's gut. He sighed happily as the twins pulled out, and pulled each other close. 
"Well, Jayden? Who had the bigger load?"
Jayden panted. He couldn't tell, in his cum-filled stupor. He looked up at them, kneeling on the floor, as he swayed a little bit, trying to think.
"I can't...I couldn't tell. Maybe I should've made you cum on me, instead of in me."
The twins sighed, not quite satisfied by this answer, but Rhys shook his head.
"It's fine. Maybe we shouldn't be such horn dogs. Ah well. Thanks for the fun, Jay. See you later."
The twins engaged in a make out session in front of Jayden, before dressing, and heading out to work out. Jayden got up, and pulled on his uniform with a grin. He then spotted himself in the mirror. His gut seemed to be noticeably smaller. It was as if Phil hadn't cum that much into him. And, his body looked...stronger. He headed over to the mirror. His arms had thickened up a couple of inches, as did his legs. He lifted his shirt, and noticed his pecs had become defined. And he was slightly taller, but only by a couple inches. He was confused, but...this felt right. He made his pecs dance, enjoying the sight, before flexing into the mirror, seeing veins properly in his arm. He grinned.
"Shit, is...is all this cum acting as protein? Fuck, maybe one day, I can be like Phil."
He examined himself even more, stroking over his pecs, and squeezing his nipple a little bit. He smirked broadly, enjoying the feeling of himself. He stripped down to his underwear, and lifted both of his arms into a flex, seeing the newfound power in them. He would turn, and flex his back, seeing each muscle strain. He even squeezed his now much thicker asscheeks together. He turned back around, and would flex his pecs, and make them dance again, before sitting on a bench, resting a hand on his round gut, and stroked it. 
"This jizz...is my ticket to studhood? I can get behind that. Or, rather, I could get someone behind me to celebrate."
He grinned, and stood up, dressing himself again, and headed out, ready for the rest of his shift, the resident towel boy ready to be fucked and toyed with in celebration of his newfound muscles.

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