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Billy shifted his weight from one foot to the other, awkwardly squirming in place.  The slight motion caused his massive thighs to tense and inflate, furthering the territorial conflict occurring below the waist.  His ample, meaty cheeks likewise fought for dominance, though they seemed to have reached an accord, the colossal cakes contenting themselves with bouncing and rippling in tandem at Billy’s slightest movement.  Meanwhile, his fat cock and girthy balls struggled more with the forces attempting to contain them than with the rest of Billy’s strapping frame, filling the pouch of the neon jock beyond capacity.  The heavy log was clearly outlined as it pulled the waist low, and frequent drafts wafted against the exposed edges of the hulking hunk’s heavy orbs.  Above the waist, Billy’s dimensional dilemma was more localized, with ample room remaining at his tight, tapering hips while his heaping pecs, bowling ball shoulders, and piston arms struggled to make do.  His neck had given up entirely, waving the wide stump that remained like a white flag as it connected to the chiseled jaw that supported the rest of Billy’s symmetrical, strikingly statuesque features.  A bright shock of lustrous, golden hair capped his superior physique, acting as the short-cropped cherry on top of the studly sunday that was his perfect body.

“This still feels so fucking weird,” Billy said as he ran a hulking hand over the sculpted slab of his heaping pecs.  The blonde’s bashful smile looked out of place on his imposing build, as if a body that large wasn’t suited for innocence or embarrassment.  “Everything constantly rubs together…and it’s all so heavy.”  He shrugged his mammoth shoulders for emphasis, a near-tectonic movement that Vince was actually able to feel through the worn wooden floors of their apartment.

“Oh, you poor thing,” the dark-haired man said flatly, rolling his eyes.  His own athletic arms were folded beneath his own impressive pecs as he leaned against the counter, his bare torso no longer looking quite as impressive by comparison.  It was still every bit as broad-shouldered and tapering, it still oozed the same masculine charm it always had, but Vince didn’t know how to handle the sudden shift in their dynamic.  He’d always been a jock, and had always maintained a fit, well-muscled physique covered in lean definition.  He was built without being bulky, all pecs, arms and abs, with a perky bubble and sturdy thighs.  And with his dark, wavy hair, along with the constant stubble coating his brooding features, he had a face to match the rest of his body.  He was a hung, handsome hunk who’d grown accustomed to being the hottest guy in the room over the course of his twenty seven years, especially when those rooms were in his own apartment.  His roommate was supposed to be a thin little twink who fawned over him, not a towering demigod with a body that even he’d spread his straight cheeks for.  “This must be so hard for you.”

Billy’s bright eyes traveled up and down the other man’s brief-clad frame.  He’d always enjoyed the view of Vince’s firm, jock body filling out his tiny briefs, and that hadn’t changed simply because the vantage from which he looked at the other man had.  “Now, now…don’t pout,” Billy cooed.  “I still think you’re super hot,” he said, making a show of eyeing Vince’s stuffed bulge.

The dark-haired jock reached down and covered himself, shaking his head.  “Don’t give me your pity ogling.  Leave me with some dignity,” he sighed, his broad shoulders slumping.  There was a moment of silence before he raised an eyebrow, his fallen expression lifting into a grin.  “Orrrrrr, you can take my dignity and anything else you want in exchange for whatever’s left of the formula,” he purred, hooking his thumbs in the waist of his briefs.  Vince pulled the straining heather fabric down, exposing his trimmed raven bush and the base of his wide cock as he flexed his abs and pursed his lips.  “I know you’ve got leftovers.”

“Dude, we’ve been over this.  It was tailored specifically to my genetics.  The folks at the lab were real clear about it not being safe for anyone else,” Billy said, mirroring Vince’s earlier pose as he folded his massive arms.  “But don’t let that stop you.”

The jock’s underwear snapped back into place.  “It’s just not fair,” Vince groaned.  “I’ve worked out daily for a decade.  A decade!  But then all you have to do is sign up for some test program and you get a body like that?  While I’m stuck like this?”

“Oh, you poor thing,” Billy spat, again mimicking his friend.  “Do you even hear yourself right now?  Are you actually complaining about being that hot?”

“Bro, YOU’RE the one walking around here in a fucking jockstrap teasing me with their body,” Vince shot back, conveniently ignoring the years of brief-clad strutting, “accidental” towel slips, and handsy horseplay he’d engaged in, all with the specific intent of taunting his little twink of a roommate.  Vince hadn’t done it to be cruel; he just liked the attention.  He got off on being desired, and he knew Billy liked to look.  It was an easy ego boost, and it was as close as the waifish little blonde was ever going to get to having a body like that himself.  Or so Vince had thought.

“Teasing?  Interesting way of putting it,” Billy said, thrusting his stuffed pouch forward as he flexed both arms behind his head.  “And here I thought we were just a couple jocks bro-ing out.  How many times have you been in this exact pose before, asking me if I thought your abs looked good enough?”  The now-brawny blonde was trying his best to keep the edge from his voice.  He’d been condescended to and toyed with for years by the other man, and while he’d been well aware that he could have just moved out, a part of Billy actually had enjoyed it.  He wasn’t above gazing at Vince’s chiseled frame if the other man wanted him to, and if his friend wanted to pull his pants down or grab his ass or surprise him in the shower, there were worse things a jock like Vince could have been doing to a waifish gay man instead.  Growing up, Billy had most of those other things happen on a daily basis, a barrage of abuse that was only made worse by his short, slender frame.  He’d been cute and mousy and femme, forced apart from guys like Vince and the mountain of muscle he’d become by a vast social chasm.  But now those days were a thing of the past.  He wasn’t 5’7” anymore, he was 6’4”, and three of his old bodies could fit comfortably inside his new one.  His voice wasn’t high and weak, it was deep and booming, and he’d grown the kind of imposing cock that the bullies in the locker room could only dream of.  The teasing and the taunting may have always just been “fun and games” with Vince, but, since he’d gotten his hands on the formula, Billy had a much better plan for how they could amuse themselves going forward.

“That…that was different,” Vince said, flustered at being called out.  “I didn’t have some science juice that would make you look like me.”

“Neither do I!  Dude, what part of this isn’t sinking in?  It was based off my genetics…my gay genetics.  What if you take it and it rewires you with a love of cock?”

Vince shrugged.  “So?  Honestly, it’d probably make my life easier.  I’m not trying to stereotype, but it seems like you guys jump through way less hoops when it comes to getting laid.  AND no pregnancy bullshit to worry about?  Sign me up, bro.”

Billy nodded.  “Since I’m a bottom, it’d probably be an extra interesting experience for you.  You’ve bragged about pounding so much pussy…I’m curious to see how you’d take to getting pounded for a change.”  He grinned when Vince’s eyes went wide and the other man blushed.

“Well, I mean, you guys can switch it up, right?  No ones, like, locked into anything,” he stammered before regaining his composure.  “But even then, yeah, fuck it.  I’d take a pounding if I had to,” Vince said, biting his lower lip as he locked eyes with Billy.  “You could be the first to walk me through it.”

The bigger blonde let out a short laugh and shook his head, his plump, bare cheeks shifting against each other as he sauntered into his bedroom.  He returned a few moments later with a small vial looking miniscule in his meaty grip, a toxic yellow liquid filling the bottom third.  The contents were practically dayglo as he held the vial up between thumb and forefinger and gave it a shake.  “I’m telling you…I know for a fact that it won’t do for you what it did for me.  If you can’t let it drop, I’m just going to dump the rest.  I don’t need it anymore, and I don’t need to keep a loaded…”

“Mine!”  Vince darted forward and plucked the vial with all the nimble grace his athletic frame suggested.  Before Billy could even try and stop him, he unscrewed the top and drained the yellow liquid like he was taking a shot, his handsome features twisting at the sour taste.  “Fuck that was nasty,” he said, sticking out his tongue and shivering like a wet dog.  He let out a triumphant laugh when he looked over at Billy, flashing a smug smile as he held up his hands and shrugged.  “I mean, you WERE just going to throw it away.”

“I guess that’s that, then,” Billy sighed, looking at the empty vial.  “Don’t say I didn’t warn you.”

“Quit being such a pussy, bro,” the dark-haired hunk scoffed.  “What’s the worst that can happen?  It’s not nearly as much as you took…it’ll probably just boost my workouts for a few days.  I’m not really expecting results like you got…but I also don’t need ‘em,” he grinned, flexing an impressive bicep.

Billy actually knew exactly what was going to happen, but he decided to keep his mouth shut.  The burly blonde justified his entire plan by telling himself that he hadn’t forced Vince to take anything, and he was never going to.  He’d known full well that the other man was going to try and steal the vial, but, if by some miracle of foresight Vince hadn’t, Billy actually was going to dump it out.  He’d also been entirely honest when he’d told his friend that the formula wasn’t going to have the same effect.  The argument could be made that the sculpted stud had lied by omission since he’d withheld what it would do instead, and he definitely hadn’t been truthful when he’d said that it was part of an “official” pharmaceutical trial instead of coming from a website selling magical services, but Vince wouldn’t have believed him about the former, and the latter felt like splitting hairs.

When Billy had taken the formula, he’d stretched it over a few weeks.  His transition from twink, to twunk, to hunk had been a gradual one, meant to give his brain and body time to adjust.  Vince’s experience, on the other hand, appeared as if it was going to be a much more rapid one, but, then again, that’s exactly what Billy wanted.  If his friend had time to see what was actually happening there was no way he’d take the full dose, and even though it didn’t need to be nearly as large as the one required to inflate himself, the hulking blonde knew his window was limited.  He also knew there actually was a chance that nothing would happen, with magic there were no guarantees, and he was thrilled when the changes were almost immediately evident.

Vince swayed as soon as he finished boasting, his eyes going wide when his tensed bicep suddenly began to dwindle.  All at once, the sculpted stud underwent a rapid reduction, losing height as well as mass in a whole-body deflation.  Broad shoulders pulled inward, plump pecs flattened, abs vanished in pairs, and meaty, mighty thighs pulled away from one another.  Like he was being sandblasted, Vince’s chiseled muscle steadily softened, his hard edges weathered away as he underwent Billy’s journey in reverse, going from hunk to twunk before eventually settling as a startled little twink.  The briefs he’d previously been poured into had become so large that they lost their hold altogether, landing at his ankles and exposing a cock that had gone from seven inches to barely half that at most, with a pair of equally unassuming balls.  Even the sharp edges of Vince’s face had been worn down, the stubble vanishing along with the brooding features until the shortened former stud was cute and doe eyed instead of handsome and smoldering.

The withered hunk stared in silence at the soft belly where his abs should have been.  His slender, shaking hands prodded toned, if spindly, arms, and the flat, faint outlines that remained of his once-proud pecs.  “What…what the fuck just happened…” he finally stammered, his face going red at the sound of his equally softened voice.  “DID I JUST SHRINK?!  WHAT THE HELL?!” he cried, the shock of it all finally hitting him.  He spread his arms and looked down at himself, then back up at Billy, gradually realizing that instead of standing 6’1”, he now topped out somewhere around the 5’5” or 5’6” mark.  “No…no no no no…this can’t…this can’t…” he muttered, repeatedly pulling his briefs back into place only for them to fall again.  He finally gave up after a handful of futile attempts, his eyes instead lingering on Billy’s even more imposing frame.  “Why am I so small?!”

It was taking all of the bigger man’s willpower not to laugh.  He could have explained that the formula actually had been based on his genetics like he’d said, but while it had been created to make himself bigger, its other intended purpose had been to make Vince smaller.  Magic, like science, could multitask.  “I very specifically told you that it wouldn’t work for you the way it worked for me,” Billy said, reaching out and swallowing Vince’s thin little shoulder in his massive mitt.

The smaller man gasped at his friend’s touch, his whole body going red when his shrunken cock sprang to its full few inches.  “But…but you didn’t say it would do this!”

Billy made a point of eyeing his friend’s diminished member, his own colossal cock twitching.  “You didn’t ask.  And, let’s be honest here…even if I’d told you this would happen, would you have believed me?”  The bigger blonde raised an eyebrow and waited expectantly as Vince’s startled expression went guilty.  “Exactly.  You would’ve just said I was making it up to keep it from you, or something equally crazy, right?”

“Well…yeah!  But…but you…” Vince sputtered, shaking his head.  He was having a hard time putting his thoughts together in his flustered state, his attention increasingly devoted to the aching lust growing at his softened core.

“Uh-uh…this isn’t on me.  I told you it wouldn’t work.  I told you not to take it,” Billy said, holding up his hand and ticking the list off with his fingers.  “I even told you it’d probably do that,” he grinned, nodding down at Vince’s firm little poker.  “But you still drank it anyway.”

“You could’ve said…you could’ve just dumped it…” Vince said, wincing at the shapeless size of his arm as he reached up and ran a hand through his hair.  He knew that Billy was holding something back, but he couldn’t put his finger on what, exactly.  “Fuck…feels like I’m wasted…” he giggled with a drunken laugh.

“That’s a good point,” Billy said, his tone softening.  He decided against explaining that Vince would likely feel that way from now on, that the shrunken jock’s rapid transition may have had some collateral damage when it came to his attention span and regulatory behaviors like inhibitions or a sense of modesty.  He put a hand on Vince’s other shoulder, letting it drift down so his fingers could close all the way around the shrunken arm for emphasis.  “How ARE you feeling?  Other than wasted, I mean.  Does anything hurt?”

Vince shook his head.  “Nah…just fuckin’ horny,” he laughed again, his face going red when he heard what he said.  Despite his apparent embarrassment, he reached down and tweaked the shrunken organ, his other hand drifting across his missing washboard.  “Look how small this shit is!  Fuck!  What am I…what am I supposed to…to do…” he trailed off, letting out a quiet whimper when his tweaking became more emphatic, the bright bolts of pleasure drowning out any voices that would have told him not to stroke his shrunken cock in front of his friend.

“Seems like you got the hang of it,” Billy laughed, tousling Vince’s hair.  Instead of stopping, the former jock beamed up at his friend, his hand slipping around from his stomach to the soft, supple cheeks that had replaced his granite globes.

“You weren’t kiddin’ about the rewiring,” Vince laughed.  “Do you…want dick this bad all the time?”

“Depends,” Billy grinned, spinning the smaller man around so he could get a look at the supple, bouncing bubble.  The cheeks were large and soft, the only bit of real size remaining on the shrunken stud.

“Did you want MY dick this bad,” Vince asked, oblivious to Billy’s prodding as the bigger man clapped and kneaded his rear.  “Cause I want yours real…oh…wait…” he trailed off, a look of revelation on his face when he spun back around.  “You said this was based on your genes, right?  But instead of making me like the new you, it…it didn’t just make me shrink…it made me like the old you!  Fuck!  I just got it,” Vince said, surprising Billy with the sudden insight.  The bigger man hesitated, unsure of just how many dots his friend was going to connect, but the moment passed when Vince reached down and started tugging away again.  “Was your dick always this small?”

“Does it matter?  I think you were just saying something about wanting my new one,” Billy reminded him, eager to change the subject.  The gentle goading was more than successful, as Vince’s shrunken hands shot out and tugged the bigger blonde’s jockstrap down.

“Whoa…can’t even get my hand all the way around it…” the former jock muttered, a surprised look on his softened face as he started stroking.  “Fuck, dude…never thought I’d actually be jerking you off.”

“That makes two of us,” Billy sighed.  “How’s it feel?”

“Real good,” Vince nodded, his free hand slipping under to start kneading his friend’s churning balls.

Billy let him take his time, basking in the view of the newly christened twink.  After so many years of being the smaller one, of being teased and taunted by Vince, the sight of the diminished jock alone was just as arousing as the sensation of the other man’s soft hands gliding along his inflated cock.  Billy couldn’t wait to dress Vince up in his former clothes, to parade him in front of all his meathead friends in his new state, but there were other priorities to attend to first.  “You can taste it,” he said, his smug grin growing when Vince’s tiny new frame went purple.

Though he hesitated, the shrunken stud eventually dropped to his knees and fit as much of Billy in his mouth as he could.  It wasn’t much, but already Vince was refining his technique, making it clear that, with a little practice, he’d be a pro in no time.  “I don’t…I don’t think I’m so good at this,” he finally sputtered, his doe eyes wide as he gazed up at Billy’s mountainous frame towering over him.

“Dude, you’re a natural,” the blonde said, giving Vince’s hair another rough tousle.  He batted the spit slick log against the man’s face a few times, eliciting a giggle and a fresh round of blushing.  “Should we…?”

Vince’s tiny frame started trembling from excitement even before he nodded.  “I can’t believe I’m saying it…but..yeah…yeah we should.  I’m so fucking horrrooohh!”  He broke off in a yelp when Billy reached down and scooped him up, effortlessly throwing him over a broad shoulder.  “Oh fuck…oh fuck…” Vince sputtered, his head spinning at the implication.  Billy was strong, but even so, the fact that he’d been so casually manhandled emphasized just how much weight he’d actually lost, to say nothing of it being an entirely foreign sensation.

“Oh, this is fun,” Billy laughed, giving his friend’s fat little rear a swat.  He tossed Vince onto the bed when they reached his room, making it a point to straddle the smaller man on all fours to fully drive home just how much bigger he actually was.  “We’ll start slow,” he said, flipping his friend over and manhandling his hips into the air.

“Fuuuuuuuuuck,” Vince groaned, burying his face into the sheets when Billy’s seemingly massive fingers began pushing inside.  There was some discomfort at first, but the grunting little twink was more focused on the fact that he had another person inside him for the first time.  Normally, he was the one doing the fingering.  It was his thick cock that went into the other person.  He was the one manhandling them, not the other way around.  But now, as Billy slowly loosened him up, as the discomfort was gradually replaced by bright bursts of bliss, Vince already guessed there’d be no going back.  Not that he could.  With his pitiful new endowment the former stud doubted he could perform the way he had, even if he’d wanted to.  Though, as Billy finally loomed against his back and steadily worked his rigid girder inside, it became clear that he very much did not.

There were no words.  Fully impaled on Billy’s warm, aching organ, Vince couldn’t believe how good he felt.  As his friend’s huge hands held him in place or effortlessly moved him around, as his softened cheeks rippled like a fleshy bumper, as his lightened voice turned into an ecstatic shriek that echoed off the walls, Vince felt his old self start to slip away for good.  There was still a part of him that knew something was off, that Billy clearly hadn’t told him the full truth, but he didn’t care.  His missing muscle and the thought of being stuck in his dazed, twinkish frame didn’t matter in the slightest compared to the pure, overwhelming pleasure ripping through his altered body.  Vince wasn’t sure he’d call it a fair trade, but at least it wasn’t a total loss.

The former jock’s meager organ erupted long before Billy’s, but he was happy to let the other man take as long as he needed.  The grunting blonde had flipped him onto his back, giving him an unobstructed view of the looming perfection writhing over him.  Billy’s chiseled features were set in a mask of determination, their sharp edges reminding Vince of the one’s he’d lost, but, as long as he got to look at the blonde’s handsome face looming over him, the now-smaller man was content to vicariously share the experience.  And when his hulking friend finally came, when his plump, soft lips fell open in a low, guttural moan, Vince would have traded away his every masculine trait as long as it meant he could feel the warm, copious loads splashing against his virgin guts.

“Well…was it as good as you’d hoped,” Billy finally asked when they’d finished.  He’d pulled out of his friend’s dripping bubble and hoisted the smaller man against him, clutching him like a teddy bear in his meaty embrace.  “I’m not as used to being in that position as you were.”

“You were fuckin’ great, bro,” Vince sighed, his jock vernacular sounding increasingly out place as it chirped out of his slender frame.  “How about this?  You give me some pointers on suckin’ your dick, and I’ll give you some tips on pounding this pussy?”

The rush Billy felt at the casual way his friend made that last statement, as well as the apparent obliviousness to it that followed, only added to the blonde’s body buzz.  He rolled onto his back, pulling Vince fully on top of him as he latched onto his friend’s battered bubble.  “Sounds like a plan,” he purred, leaning in for a long, lingering kiss.