"Nngh," Andy grunted in response. He had difficulty scratching his balls and had to reach around his enormous pecs. "I dunno what we should do, but my wiener feels weird. Why is it so big and, ugh, hot." His lengthy penis wagged like a dog's tail as he scratched those newly grown melons. He squirmed like a kid in itchy clothing; it looked strange on such a masculine and erotic figure. His dick already started to plump up at the slightest of stimulation.
'Wiener?' Ben thought. Does he still call it that? Does he even know? Ben had an older brother who didn't hide his porno mags too well. But surely his friend couldn't be this innocent? I mean, they're in middle school for crying out loud. Ben's thoughts were interrupted by another of Andy's deep grunts.
He gasped as he saw Andy sprouting dark hair around his crotch. The short fuzz became longer and spread up his treasure trail and down his legs. "Why am I so itchy!" Andy couldn't see anything beyond his pecs but he soon felt the hair surrounding the base of his cock and followed it up his abs. His arms and pecs bunched up and rubbed against each other sensually.
"Andy, you're getting hairy! Look in the mirror and see for yourself." Andy waddled away excitedly while still scratching various parts of his body. Ben admired the vast network of muscles that rolled and flexed on his friend's back. And that bubble butt! It was as big as two soccer balls and it jiggled with each step. The footfalls rumbled and could still be heard even with Andy out of sight. Ben had an idea.
Andy was so preoccupied with his new appearance in the bathroom he didn't even hear his friend moving around the house. Wow, he thought. This is all me. With one hand still scratching his treasure trail, his other raised up to flex his unbelievable biceps. The mounds on his arms pushed up and up until it formed a peak even larger than his head. Hell, it even reached as high as his head. "Ooh, yea," he purred. He stuck out his tongue and concentrated harder. He could see his biceps strain and stretch in front of him.
Andy pulled his arm close for a lick. It looked so big and smelled musky. He was positively drawn to it. But then he noticed a similar tingling feeling under his arm and watched in awe as more body hair sprouted.
Andy was hit with a heavy wave of his own body odor and was absolutely entranced. He didn't even notice his friend approaching behind him, or that his own cock was rising and bent over the sink.
Andy started to drool at his display of strength. His mind swirled as he watched his armpit grow a thick, sweaty bush of dense hair between his bulging traps and arms. He was already a sexy beast, but this was bringing him to the next level. Andy growled and clenched his fist harder, making his biceps bounce.
Suddenly, there was a strong hand on his bare butt. "Hey there, stud." Ben squeezed his slightly smaller frame into the bathroom behind Andy and ogled at the muscle god that covered the entire mirror. His other hand groped the other cheek and they started to massage his behind.
"I'm so big," Andy mumbled.
"I know."
"I can't even fit in any of my dad's clothes." He felt like he was in a dream.
"Mhm, just look at that arm."
"Hey Ben," Andy brought up his hand onto his flexed bicep.
"Yea?" Ben moved closer and started pulling his ass cheeks apart, admiring the tight, clenched hole.
"Why is my penis like this?" Andy's innocent question combined with his burly voice took Ben for a spin. He stopped in his tracks and ducked under his friend's traps to marvel at the beast and his... well, beast.
Ben's jaw dropped at the sight before him. Andy was like a pervy comic book artist's work come to life. His pecs were like overblown pillows, but were firm and had a thick coat of body hair that spread from the center. His nipples were spared, but would've stuck out anyway as they stiffened to pink thimbles that pointed downwards towards his abs. A row of his 8-pack was completely eclipsed by massive pecs, but jutted out regardless even with the giant shaft looming in front. It waved slowly, hypnotically, almost calling to Ben.
"Well," Ben said, snapping out of his daze, "why don't I show you."
The contagion given to Ben also gave him a new skill that he didn't know he had until now. It just came to him like instinct. He cautiously grabbed onto his friend's monster with both hands, unable to even reach around, and let his tongue glide up the shaft like a lollipop. Andy shuddered and his cock gave a jolt, thickening even more.
"Woah, B-Ben... What's going on? What's this have to do with it?"
"When you really really like someone, your 'wiener' gets big and hard like this. And I," he stuck out his tongue and ran a long, achingly pleasurable lick, "really really like you." Ben jerked his hips for emphasis, his cock slightly smaller at 10 inches, but hard as an iron rod compared to Andy's semi.
Ben's cock made a slap against his friend's shaft, and Andy had to look beyond his pecs to see the drooling cock head. His mouth watered with anticipation.
"I really thought you would've at least learned this in school by now." Ben began to slowly stroke Andy's hardening member with both pumped arms. He had difficulty going low since his lats pushed his arms up.
"I , ummph, was gonna have a lesson on sex ed next week in P. E." Andy whined, unable to resist his beefy friend's hand job.
"Let's get a 'head' start then." And with that, Ben engulfed Andy's fist-wide cock head. His larger friend moaned at the sudden shift in gear.
Wow! Andy couldn't even describe what he felt. The pleasure he felt while growing and showing off his muscles were like candles compared to the white-hot light that he imagined now as he gritted his teeth and held firm. Andy was the 600 lb muscle kid here, not Ben! Andy loved what his friend was doing, but wanted to make sure that HE was the one in charge. It was HIM that first received the contagion, so it should be HIM that shows Ben what to do here.
Andy shoved his still-raised biceps into Ben's face. "S-see how big I am?" He grunted between pants. "It's even bigger than your- ah, head!" Ben's eyes were wide as saucers as he had no choice but to inhale the deep scent that wafted from Andy's pits. But that only doubled his efforts. He moaned, causing his entire mouth to vibrate. And as if on cue, Andy's cock popped out of his mouth and rose even higher! Ben had to look up, the erection now taller than him. Andy's pride was finally fully hard, a rigid pole of pure sexual energy. The droplets of pre-cum became a steady trickle that only made both boys salivate. Little did either of them knew, they were still growing as the contagion bounced back and forth between them with each physical contact they make.
Ben, refusing to back down from this challenge to show Andy the true purpose of his rod, hoisted himself up the sink by holding onto his friend's bowling ball deltoids. He remembered watching how bottoms prepped themselves in pornos and shoved his ass in Andy's surprised face. "I wanted to go first, but it looks like plans have changed. Now lick, stud." He stretched his cheeks apart to reveal a rosy pink bud.
Andy was so hot and horny he was willing to do anything, and the contagion inside of him drew him closer, desperate for any kind of contact. He admired Ben's marvelous butt before closing his eyes and sticking his tongue at the hole. It immediately puckered tighter, then loosened to allow the tongue inside just briefly.
Now it was Ben's turn to moan submissively. His deep baritone rattled the mirror in front of him. Andy took this as chance to regain dominance and lost all inhibitions as he plunged his tongue deeper into the smaller muscle kid. He was so focused on making Ben moan he didn't even notice his dick growing longer, poking the underside of his pecs.
It wasn't until he felt a wet spot on his chin that Andy stopped his assault on Ben and glanced down to see that his freakishly large cock pushed itself up through his pecs and his now drooling pre-cum over those two meaty slabs of muscle.
Ben looked back with his tongue dangling out, wondering why the huge brute he called his friend stopped. He gasped. He couldn't believe how much bigger it had gotten! The rim job did not prepare him for this.
Andy briefly saw his dick as a nuisance until he tried to push it outwards, but his pecs and arms squeezed together even tighter and reminded him why he was feeling so much euphoria. There was another jolt and his monster grew another few inches in length, pushing past his chin and now being met face-to-face with the mushroom cap.
And then everything fell into place. Literally.
Andy looked back up at Ben with a face of desperation and longing, unable to free his shlong from pec-prison. Ben, seeing his best friend in such a state of weakness despite being so much bigger and still growing, couldn't take it anymore and his legs gave away, falling back towards Andy.
Ben's asshole landed right on top of Andy's cock head, and the contagion stretched him just enough to take it all in, welcoming the ultimate method of contact. Andy received first-row seats at this show yet couldn't feel anything else except for the sheer pleasure of Ben's ass sliding down the gigantic cock in front of him.
Ben, on the other hand, was seeing stars and had already passed out from the sudden insertion. The contagion may have stretched his ass just enough for the head, but it wasn't ready for the rest of the thick shaft as he was quickly sliding down and forward, pulling the dick free from Andy's globes of muscle. Despite everything, he was still feeling everything in the moment; he just won't remember much of it.
Andy grunted and growled and bounced his pecs and flexed both of his biceps as Ben kept sliding down on his shaft. This was it, he thought, 'I finally get it now!"
Andy grabbed Ben's pecs from behind and pulled him close. His hips started thrusting uncontrollably. Andy felt all of Ben's muscles and grabbed onto those giant nipples that were now the size of thumbs. He felt his iron rod pulling in and out of Ben's gut from the front, pushing through the abdominal walls with such erotic force.
Andy massaged Ben's pecs hard, pushing his gigantic palms onto the moldable mass. He tried to wrap his hands around his friend's arms, unable to make a dent even unflexed.
He was so hot, he couldn't take it anymore. Andy panted and inhaled the overwhelming musk coming from his body. And then it happened. Against all odds, Ben regained his consciousness for a brief moment and shoved himself down the last 6 inches until he was balls-deep. And what balls they were! Each one hung like soccer balls between his tree-truck thighs and pulled up at the sudden, final advance of the smaller muscle boy. "Cum for me, stud."
Andy opened his mouth and groaned. He wanted to be top dog, the biggest and strongest, but his friend played the ace up his sleeve and commanded him to cum in the richest, rumbling tone he'd ever heard.
Andy's groan became a roar as his first shot rocketed up his shaft and hit Ben so hard he rose up two inches. Each shot was as powerful as the last, and Ben and Andy rode it out like it like a never-ending wave. Ben couldn't stop moaning as he felt each shot filling up his gut, pushing his abs outwards like the monster did before. Loud spurts erupted from Ben's ass and cum pooled at their feet.
But before either of them were close to being done, they felt a familiar tingling sensation, except Ben felt something far stronger.
Andy felt himself stagger forward, losing balance and holding onto the sink. It creaked under his inhuman weight, and only grew louder as he packed on more and more pounds of muscle. His pecs pushed forward as if he were bouncing them, but they retained their bigger size with each pulse. His field of vision became further obscured, his friend no longer in sight. 'How,' he thought, 'did my entire penis fit inside him?' His attention was redirected to his arms, which bulged obscenely and fought for space against the traps. His abs bulged and hardened against Ben's back. His neck and shoulders tried to surround his head, and his legs desperately attempted to catch up to support all that weight.
Andy saw the cherry on the cake to this growth spurt: a five-o-clock shadow appeared on his face while it was simultaneously reshaping itself. He finally felt like a man, and the 3 foot cock was a bonus. He was growing hair all over his body, and his stink that permeated the bathroom was raw and mind-numbing. His muscles made him look like one of the most freakish bodybuilders in the world morphed on the internet, his hulking stature reaching 7' 2" at 750 lbs, and he was only 14 years old!
Andy grinned at his reflection and brought one hand up to tweak his enlarged nipple; it became a challenge with all his mass. He was rewarded with a jolt from his still-hard cock, but then he heard a moan coming from Ben beneath him.