Beefcakes

Commission

It was late afternoon, the peak hours in the most famous gym in the city. Everybody who wanted to show off their sculpted bodies and flaunt with no shame or filter came to this gym. The smell of sweat was thick in the air, as was the sound of grunts, laughter, and loud music thumping overhead.

The place was crowded, and five guys laughed near the free weights section. They weren’t massive, but they acted like they were. Their shirts were too small, shorts too short, and their egos filled the gym more than their bodies ever could. They were loud, cocky, always performing, and posing in front of the massive mirrors. It was part of the game. People watched because it was fun, even though there wasn’t anything impressive to see.

Among them, Finn stood out—not because he was a foot taller or twice as wide, but because of how he carried himself. He was the biggest of the group by a margin—a small one, tall and tan with a thick neck and defined arms that flexed almost constantly. His biceps bulged even when at rest, crisscrossed with veins. He wore a grey tank top that clung to his torso. His shorts were navy and tight enough to emphasize his lean thighs and a slightly exaggerated swagger. It was evident he worked hard to look good, but more than anything, Finn loved to turn heads—it was his fuel to keep working out.

He had a reputation—not as the strongest or the most attractive, but as the most in-your-face confident. Finn could walk into a room and make you believe he was a ten, even if he was an eight on a good day. He talked aloud so everybody had to look his way. He constantly bragged about his physique, his sets, and his dates. He had a habit of saying, “Six inches is all a real woman needs,” with a smirk that made people wonder if he was bluffing. And he was. His cock was five inches, barely. But the world didn’t need to know that.

Today, the group had just finished their set of deadlifts. The bar clanged back onto the mat, and Finn took a moment to admire himself in the mirror. He loved how he looked after the workouts as sweat gleamed off his traps and shoulders, catching on the edge of his tank top. The lights made him look bigger right now. He grinned, raising both arms in a double biceps pose and letting out a satisfied sigh.

Then he saw them. Two young women near the stretching area were whispering to each other while stealing glances at him. One of them bit her lip, and Finn’s grin widened. The girls were hot, and many things crossed his mind. He had never seen them around, so it was good to have new admirers.

He turned slightly, angling his reflection just right, and reached for his black shaker bottle. The label read “TITAN FUEL” with lightning bolts and flames printed down the side. He popped the lid with his thumb and took a long, theatrical sip while still looking at his reflection. He flexed one arm, making sure the girls saw every striation of his triceps. He even gave a playful wink while still drinking.

Then he capped the bottle and, with a bounce in his step, casually headed for the girls like he was walking through a music video. But as he passed the squat rack, a strange sensation surged through his core. It started like a flutter, almost like butterflies in his stomach. But then the tingling moved lower, making him subtly shiver.

He stopped mid-step as the tingling focused right in his groin, and his eyes widened when he felt his cock stirring. His cheeks flushed, not because it was visible—it wasn’t, not really, not at his size—but because he suddenly felt exposed. His cock soon reached its five-inch hard state, and despite not being impressive, the bulge was unmistakable.

He pivoted quickly, pretending to head for the water fountain, and made a sharp turn into the locker room area to grab his bag before heading for the men’s bathroom. Finn locked the door and moved into the far end to place his bag down. He checked to make sure he was alone, and with his usual cocky air, he decided to handle his hard-on before going back to the girls.

He slowly tugged down his navy shorts and adjusted his waistband, still holding himself like he had nothing to hide—even if his five inches were beginning to throb in a way he couldn’t quite control. He frowned at the growing tightness, as the cool air against his cock made his horniness rise without explanation. He shook his head, flustered and needing to shoot a load. He wasn’t used to doing this in public places, but couldn’t help himself. He couldn’t resist it.

“What the hell...” He said, gasping and wrapping his hand around his cock. “Fuck! I’m so hard!” He said, firmly stroking his cock and closing his eyes.

The tingling flared up again and spread across his whole body. It moved to his lower abdomen, then over his chest, legs, and arms. His skin flushed. Suddenly, he felt pressure. His traps tightened, his biceps twitched, and his chest heaved.

He staggered back a step, grabbing the wall for balance as his attention moved from his cock to process what was happening to his whole body. “Ngh—Uhh!”

His arms began to swell. It wasn’t only a good pump. It was real growth. It started with a subtle throb, then became a visible expansion, like someone was inflating them from within. His biceps pushed outward, rounding rapidly, swelling as veins thickened and traced over the peaks. The skin tightened, gleaming with sweat and stretching to accommodate the mass forming beneath. His forearms thickened fast, and each wrist twist made his muscles flex unnaturally large.

His snug tank top began to betray its limits. The thin cotton clung desperately to his widening torso, creaking audibly as his pecs began to expand. Each breath forced them out farther, lifting the fabric inch by inch until it stretched over his nipples like a drumhead. The neckline curled and deformed, and the collar pulled taut as his pecs rose like a shelf.

With a sudden, ripping SNAP, the neckline split down the middle, exposing his sternum and the deepening cleft between his chest. The sides of the tank began to fray as his lats flared outward, broadening his frame until his armpits strained the edges of the thin straps.

“What the hell is happening!?” he groaned, in panic and disbelief.

But it felt good. Sinfully good. Finn’s whole body warmed up as his muscles expanded rapidly. His abs flexed violently as they thickened and segmented, forming a wall across his torso. Each heartbeat sent more waves of growth through his body.

Then, his thighs trembled and expanded outward like someone had crammed a second set of muscles into them. Deep grooves formed between his quads as veins branched in thick rivers across the surface. The waistband of his shorts stretched, and the elastic nearly cut into his skin. He tried to move, to brace himself against the wall, but his back arched sharply as his lats swelled outward, stretching his sides to absurd widths. He was getting wider, broader with each breath. His entire frame was ballooning in slow motion.

He stumbled toward the mirror, with sweat pouring down his whole body, only to catch sight of his reflection as his traps expanded until they nearly touched his ears. His neck thickened too, merging with his traps into a column of solid meat.

The tank top—what was left of it—finally gave up. With a sharp, violent RRRIIPPP, the side seams split all at once, and the front panel peeled back off his chest, falling open like an unwrapped gift. The straps snapped one after another. What remained hung from his waist in tatters, unable to cover his new immensity.

But the growth continued. Finn’s calves thickened from toned cylinders to rock-solid bulges that flexed with every twitch. The tension traveled upward, and his thighs followed, trembling violently as they thickened like rising dough under pressure. Veins snaked across the surface as muscle stacked upon muscle. The snug navy fabric clung for dear life against the growing mass until the seams along the inner thighs audibly groaned—then failed spectacularly.

POP! POP! POP! Came the sounds of defeat echoing in the bathroom, as the shorts split wide open from crotch to mid-thigh. Torn fabric sagged off the new slabs of his thighs.

“Nnghh—ahh—” Finn moaned, panicked but euphoric. He doubled over, panting, and as he thought the worst had passed, his ass clenched and exploded outward, swelling and rounding with a pressure that pushed them far past what his shorts could contain. The waistband strained audibly before the back of the shorts tore apart with a loud RRRIPPPP as fabric tore like paper around his massive ass.

Finn staggered forward again, feeling the last remnants of his shorts hanging off him in useless strips. His skin glistened with sweat, and his heart thundered in his chest. Every inch of him pulsed and throbbed, like his whole body was trying to expand beyond itself. He was massive now—an entirely different breed of man, easily twice his former weight, if not more.

His shoulders had grown into mountainous rock-like balls, each one wider than his head and pushing his arms out at an angle. His traps funneled up to his neck, so high they nearly brushed his jawline, while his pecs jutted forward like slabs of granite, bouncing slightly with every breath. They cast deep shadows over his abs, which stretched from his chest to the waistband of the tattered remnants of his shorts like a brick wall.

His arms were monstrous. Each bicep was the size of a football, bulging and veined. His triceps swelled beneath, adding even more girth that made it impossible for his arms to hang at his sides properly—they floated slightly, fighting for space with his enormous lats.

Down below, his quads were tree trunks of muscle, and his ass propped him into a slightly forward-leaning stance, unable to sit or move like a normal human anymore. Every curve of his body was exaggerated to superhuman proportions. Finn was a titan now, a behemoth. And he had no idea how to deal with it.

Still panting, he looked at himself. The torn tank top, shredded shorts, and veined muscle swelling in every direction were breathtaking. He couldn’t move the way he used to. “Dude... what... is this...” he whispered, in awe and horror. And then he felt the tingling in his core again.

His already massive form began to bulge. But it wasn’t like before. This time, his frame was getting rounder and softer. He felt a new fullness spread beneath his skin. The sharply defined cuts of his biceps and pecs blurred slightly as a thick layer of plush bulk padded over the muscle beneath. It wasn’t pure fat—it was more like the dense softness of an off-season bodybuilder. He looked huge, massive, gigantic, but in a softened way.

His stance shifted involuntarily as his thighs grew even thicker, pressing against each other as his ass swelled outward again, rounder and bulkier than ever. His balance shifted as his hips widened to accommodate his rapidly growing lower body. His legs trembled as his ass expanded to near comical proportions. It was firm, heavy, perfectly round, and so massive that it jutted outward like overstuffed cushions.

Then his abs began to fade. One by one, the ridged bricks smoothed out as his belly began pushing forward, growing outward, inch by inch, until he had a firm curve pushing against the remains of his tank top like a basketball beneath his chest. But it didn’t stop.

“Ughhh—wh-what the hell?!” Finn gasped, gripping the sink again.

His rounded middle surged forward as the tight skin stretched like a taut drumhead. The tautness was incredible. The belly looked soft, but it wasn’t. It was firm. He looked like he was bulking out of control, but the weight concentrated in his belly.

Then he felt something move inside his middle. Initially, it was a soft flutter. Then another. His swollen belly jiggled gently, visibly reacting to the movement beneath the surface.

“No. No way. What is this—what IS this?!” He groaned, stumbling backward as his belly continued expanding, rounding, and swelling outward and downward unstoppably.

His belly pushed so far forward that it cast a shadow on the bathroom counter and the floor beneath him. Veins trailed across the surface as its weight pressed down. Finn cried out softly, moving both hands on the sides of his round, firm dome, feeling every shift inside. He suddenly realized the movements were babies growing inside his massively rounded belly. He didn’t know how many were inside him. But they were moving.

His mind wandered, still processing the intense sensations coursing through his body. Then, he suddenly knew it, somehow. Fifty babies were moving inside his belly. His belly expanded enormously, bigger than anything he had ever seen before. Bigger than the rest of his body and heavier than the heaviest bodybuilders in history. Soon, the fifty babies were full term and kicking up a storm, leaving him breathless.

His chest swelled next. It was already large and muscular, but his pecs grew heavier and rounder as their shape softened. His nipples were visibly puffier, and his pecs grew so large and full that they started to block his view downward. Then the sensation shifted—his chest tingled. It sloshed, filled with ridiculous amounts of milk.

He felt the milk pool and thicken inside his expanding pecs, transforming them into massive, overfull reservoirs. They sloshed as he shifted his weight, bouncing, jiggling, and throwing his balance off even further. He gasped, moving one of his hands to clutch one of his heavy tits, but not even his large palm could cup it. Each pec was bigger and rounder than a basketball, resting heavily atop his enormous belly.

His underwear was the last to go. As his hips broadened again and his ass expanded into the size of couch cushions, the waistband groaned and stretched beyond its limit. Finn could feel the elastic cutting into his skin, making him wince at the intense sensation.

“Nnnghh—ahh—fuck—” he groaned, adjusting his stance as his ass clenched and swelled. “Hnnnghh—ah—ahh—!” he said as mass—fat and muscle—stacked into his already enormous butt. Its size defied logic and gravity. It soon was big enough to fit several grown men, like an oversized couch.

Then came the breaking point. With a sharp POP, the waistband gave out. The sound echoed through the tiles as the fabric tore down the middle with a violent, tearing RRRIIIPPPP. Split seams exploded as his underwear failed spectacularly. Shredded cotton snapped in every direction, curling around the new mounds of swollen body.

Finn gasped and groaned again, louder this time, trembling from the intensity of the release. “UHHHhh—F-Ffuuu... nghh—!” His massive ass jiggled slightly from the force, freed from all restraint.

Every breath dragged a fresh moan from his throat, overwhelmed by how it felt to expand so uncontrollably. And then, his groin heated. He felt a warmth pulse through his cock as it began to stretch—longer, harder, throbbing with each pounding beat of his heart. His breath caught in his throat as it swelled outward, forcing itself against the taut underside of his belly. It grew fast, thick, obscene—impossibly large—until the shaft extended past his knees and still showed no sign of stopping.

His cock pulsed, leaking thick beads of pre-cum as the stimulation from his expanding body sent wave after wave of involuntary pleasure through his core. His balls dropped low and expanded to match, growing rounder, tighter, and impossibly heavy with cum. They slapped gently against the insides of his thighs as they expanded, so massive now that they swung with weighty force even from the slightest movement.

“Ahhh—p-please—ohhhnn—” Finn moaned, closing his eyes as his hips twitched. His whole body reacted to this sensation. He couldn’t control it. And deep inside, he didn’t want to. He was sweating rivers now, dripping down the canyon between his pecs and over the massive round dome of his belly. His whole form was obscene, huge, round, and powerful. He was a mountain of overbuilt bulk, with a belly massively filled with life.

He could barely waddle. Every part of him felt full, stretched, and overflowing. His thighs rubbed together with every step. His ass was so wide he had to walk bowlegged. His belly stuck out far enough that he couldn’t reach past it, impossibly packed with 50 full-term babies. His chest jutted over it, massive and soft, with swollen nipples ready to shoot torrents of milk. And his cock remained hard and upright, cradled against his belly.

He was the image of a pregnant beefcake. Heavy with life, built like a fantasy, and overwhelmed by his body. He was still staring at his reflection, panting and flushed, when a knock came from the bathroom door.

“Yo, Finn—you good in there, bro?” He heard one of his friends’ voices.

Finn blinked and panicked. He looked down at himself—sweaty, swollen, and naked. The remains of his shredded tank top clung to one shoulder, fluttering uselessly, and his shorts were nothing but scraps of waistband and a hanging thread. He couldn’t open the door like this.

“Shit… I can’t open the door like this,” he said, blushing deeply.

Then he remembered his gym bag on the floor near the sink. He groaned, struggling to move there and lean down to reach it. His massive belly pressed against his thighs, and his pecs squished up to his chin. It took real effort to bend. He grunted as he hoisted the bag up, setting it on the counter with a heavy thump. He yanked the zipper open and rifled through it quickly, but his heart sank. He couldn’t find his clothes.

Confused, Finn pulled out a gray crop top that didn’t look big enough to cover his overinflated tits, not even thinking about doing something for his belly. Next, he pulled out a pair of short navy gym shorts that looked more like underwear than pants. He stared at them as his friends knocked at the door again.

“I’m coming. Give me a minute,” Finn said aloud, trying to sound casual. “You’ve gotta be kidding me,” he whispered, trying to come up with another plan to cover his body, but the crop top and the shorts were all he had.

He started with the crop top. Lifting it over his head took effort. But it barely stretched wide enough for his chest. He grunted, puffing as he worked the material down his bulging tits as the milk-filled masses sloshed with pressure. “Nnnghh—c’mon—just a bit more—”

The fabric squeezed over one pec—then the other—with a wet slap. The top hugged tightly, practically vacuum-sealed across half of Finn’s chest. It looked like a skimpier, sluttier version of his usual tank top. His nipples peeked out from the stretched neckline, and the fabric pinched his traps.

He groaned, breathless. “This is ridiculous.”

Next came the shorts. Finn tried to step into them, but his thighs were so thick now that it was almost impossible. The waistband stretched to its limit, but at least the fabric cooperated. “Hhhhngh—ahh—fuck—” he moaned. When he finally yanked them over his butt, it felt like trying to shove a beach ball into a sock. His cheeks stuck out on the sides, more exposed than covered. “This isn’t shorts—this is dental floss.”

His cock throbbed hard, making him wince. It was way too big to fit. It slapped against his belly, still leaking steadily. “Damn it. It would fit if it were soft…” Finn said, but no amount of shifting helped. Eventually, he managed to tuck his balls—barely—into the tight pouch, but the shaft had to stay out, arching proudly up against his gut.

By the time he was done, he was panting. Sweat poured from every inch of his overgrown body, and even now, he wasn’t fully covered—only slightly less obscene.

Then, wobbling slightly, he waddled to the door and pulled it open. Caleb, Ryan, Jax, and Theo entered immediately, leaving Finn wide-eyed in shock. They were as huge as Finn. Their bellies looked massively rounded with many babies, fifty babies if their size—same as Finn’s—was an indication. Their arms, pecs, thighs, and butts were all swollen and round. They were shirtless, only wearing too-snug shorts that could barely hide anything and left most of their asses exposed at the sides.

“Dude!” Jax laughed, staring at Finn. “You started without us? Why are you jerking off instead of fucking one of us? Or all of us.”

Finn’s mouth fell open. “Wait—this happened to you too?”

Caleb stepped forward, looking confused. “Uh, yeah? What do you mean? Getting pregnant? You were there when this happened. Like, YOU were there!” he said, patting his belly, as big as Finn’s, while visible limbs pushed outward across the taut skin.

Ryan grinned, rubbing his own abdomen. “He’s playing it dumb to convince us to let him fuck us again. You don’t need to pretend it, bro. You know what will happen.”

Theo reached for his chest and softly patted it. “Exactly. It’s not like we’re gonna say no to that cock. And you know it.”

Finn blinked, stunned. “Hmm… okay,” he said, realizing his friends thought they had always been like that. None of them realized anything was off. To them, this was normal. It had always been normal. He was the only one who remembered the way things used to be.

Finn groaned lightly, still adjusting to the sheer mass of himself, but some part of him loved it. He smirked, pressing one hand against his side of his belly and the other gently cupping the underside of his right pec. Finn looked at them—four massive, round-bellied, bloated beefcakes. And suddenly it all felt right.

He grinned. “Alright. I hadn’t done much. So you came in right on time,” he said, trying to reach lower to caress his massive cock, but unable to touch it due to how massive his belly had gotten. “Ugh. I definitely need your help to bust a nut.”

His friends grinned and, one by one, leaned against the counter, exposing their fat asses to an extremely horny Finn who couldn’t move easily anymore but could definitely fuck his friends long and hard. He rubbed his belly and got right behind the first, Caleb, and with a slow thrust, he slid his massive cock into the other man’s tight hole.

Finn wondered how it had happened and remembered a new supplement the five of them had taken that day. He couldn’t remember the name, but he loved the results. He completely forgot about the girls from earlier, the shock, and the horror he felt while his body expanded. All he could focus on was his friends’ moans as he had his way with each one, and getting ready to receive the same treatment in payment.

The End

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This is a HOT story commissioned by the great @trtyutr. Go check his profile on Tumblr. I 100% recommend it.