Protein-ing Sam (Patreon)

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Sam had been working at the new mall for a few months, long enough to stop noticing most of the stores coming and going around him. The place was still unfinished at one end, with temporary walls covering empty units and construction crews working even after closing. So when a gym opened in one of the far corners, he barely paid attention at first.

However, noticing that the gym always seemed empty, Sam’s curiosity grew. The lights were on, and the equipment looked brand new, but Sam never saw anybody using it. One night, after his shift had ended, he finally decided to take a closer look. He said he knew better than to wander into strange businesses after closing, but he had always wanted a bigger body, and the rows of machines through the glass were too tempting to ignore.

As soon as he walked in, his eyes widened in shock. The first sign that the place wasn’t normal was the receptionist. He looked young, probably working there between college classes, but his body was ridiculously enormous. His arms stretched the sleeves almost to the tearing point, his shoulders made Sam wonder if the young man even fit through doors, and his traps crowded his thick neck like a pair of flesh-colored hills.

And even with such an impressive frame, the young man’s chest was ridiculously oversized—two huge slabs of meat that projected so far forward that the shirt barely touched his abdomen below. His nipples were clearly visible through the fabric, so rigid that they looked as if they were about to cut through. His legs and ass were oversized, so thick that Sam wondered how the guy bought normal clothes. Even the bulge at the front of his shorts was absurdly full.

The receptionist noticed him staring and smiled. “Hey, sir. Welcome to FitMax!” he said, but Sam remained speechless for a long awkward moment. “So, you wanna train, or are you just here to look at me?” The young man added, playfully bouncing his pecs.

Sam laughed and leaned against the counter. “Both. What the hell do you take?”

“Protein shakes,” the receptionist said, lifting one arm to flex his bicep. “Good protein.”

Sam looked down at himself. He was healthy, but next to this guy he felt narrow everywhere. His arms looked small, his chest flat, and his thighs ordinary. Even his cock and balls seemed less impressive somehow when the rest of his body suddenly felt so average. Thankfully, the receptionist wasn’t looking anywhere near there, though. Sam had always imagined himself with a bodybuilder-sized frame, someone who had to turn sideways through doors. He had always cared most about his chest, longing for pecs that didn’t only look wide from the front but also thick, deep, and heavy so they stuck out several inches in front of him.

“I want to be big,” Sam said. “Not fitness-model big. I mean stupidly big,” he added. “Especially the chest.” His eyes landed on the receptionist’s pecs.

The young man nodded and led Sam into the gym area. He took his time showing Sam the machines, and eventually handed him a thick protein shake from behind the counter. Sam didn’t pay much attention to what was in it, but he remembered the receptionist saying that “protein” had gotten him that big, so he was willing to try whatever it was.

“Ready for a quick workout?” the receptionist asked. “We need to set your working weights, starting strength, and stuff like that.”

“Oh,” Sam paused. “I didn’t think we would be getting started right away.”

“We sure are,” the young man replied. “Want some gains? You better work for them, and you’ll get there soon.” He flexed his bicep, and the T-shirt creaked faintly.

The workout felt incredible. Every machine seemed to force Sam’s muscles harder without hurting him, and the pump felt incredible. His arms thickened beneath his sleeves, his shoulders looked rounder, and his thighs started pressing against his pants. His chest responded fastest, pushing against the front of his shirt after only a few sets of flat presses. He wasn’t sure, but he swore his pecs weren’t only swollen with blood but actually larger. He stood in front of the mirror and flexed as the receptionist instructed him, watching the muscles bunch beneath the fabric. They had already gained noticeable depth, and his shirt stretched nicely over his fuller body, which he knew made no sense during a first-ever workout.

By the time Sam got home, he knew something big was happening. He stripped in front of the bathroom mirror and spent a few minutes staring at the reflection. His shoulders had broadened, his arms were thicker, and his abdomen looked tighter because his upper body had expanded around it. His ass had gotten fuller and firmer, his thighs felt heavier, and his whole frame seemed denser. And still, the biggest change was his chest. His pecs had expanded into thick, rounded mounds that projected so much from his ribcage that they cast a shadow over his upper abs. The canyon between them already looked impressive, but he couldn’t help but press his chest inward to accentuate the depth.

He expected the effect to fade while he slept. Instead, he woke up much bigger. The next morning his chest felt heavy before he even opened his eyes. When he sat up, both pecs pulled forward with more weight and thickness than before. They had grown overnight, so wide that they pressed against his upper arms and so thick that he couldn’t see most of his abdomen when he looked down. His shoulders had grown as well, along with his lats, arms, thighs, calves, and ass, as though the rest of his body was adapting to carry his chest.

Sam went back to the gym that night, feeling eager to work out again.

The receptionist looked at him and smirked. “You respond fast.”

Sam grabbed one pec and lifted it slightly. “Fast? This is fucking insane.”

“You complaining?” the receptionist asked.

Sam looked at himself in the mirror beside the desk. Even standing relaxed, his chest looked bigger than most competitive bodybuilders at full flex. “No.”

“Great then,” the receptionist said. “Let me get you a pre-workout shake.”

Sam nodded and headed for the machines, ready to test his newly grown muscles.

Over the next day, Sam’s entire physique exploded with muscle. His arms got so thick that his old sleeves were useless. His thighs rubbed together when he walked, and his ass stretched every pair of pants he owned. His back flared outward, his core thickened, and his calves got rounder. And still, it was his pecs that grew faster than everything else. They swelled in all directions, especially forward, and so thick they pushed his arms farther from his sides.

By the second evening, the chest had started changing even more. The upper part was still dense muscle, but the lower halves had gained an unfamiliar fullness that Sam was loving. His pecs were rounder and much heavier when he moved. The nipples were larger and more sensitive, sticking out prominently on the stretched surface. When he took a step, the huge masses swayed and jiggled slightly instead of moving like solid muscle.

He stood in front of the mirror, holding one pec with both hands. “These are starting to look like tits,” he whispered, and his cock stirred at the idea.

The next morning, his description seemed accurate. Sam woke with an intense pressure across his chest. Both tits felt swollen, hot, and painfully full. They had grown again overnight, rounding out even more and pushing forward so much that they looked like a pair of beach balls squeezed beneath his pecs’ skin. They hung slightly under their weight despite all the hard muscle supporting them. His nipples had thickened, darkened, and gotten more pronounced, along with broad areolas that were incredibly sensitive.

Sam cupped one tit from underneath and felt something strange inside it. The weight felt different, almost as if there was a deep liquid fullness pressing outward.

“What the fuck?” He squeezed carefully, and a white bead formed on his nipple.

Sam froze, staring at it, and another bead soon followed, swelling until it slipped down the nipple and traveled down the heavy tit. He touched it with one finger, looked at the white liquid, then pressed again into the taut flesh. A thin stream of milk shot out, and Sam jerked his hand away. The stream stopped after a second, leaving milk running down his chest. He stared at the nipple, then at the other tit, and a small white drop appeared there as well.

“Oh, fuck me,” he whispered, wiping both nipples with a towel. But soon they started leaking again. “You’ve got to be kidding me.”

Drops grew into thin streams, and Sam kept pressing the towel against his tits, watching wet patches spread through the fabric. The problem was that his chest kept getting fuller while he was standing there. He could feel it happening. The tits were swelling beneath his hands as the skin stretched tighter over the increasing volume inside them.

Sam grabbed both tits, and his hands looked tiny on them, which scared him for a moment. Then, milk began running between his fingers even as he shifted his grip to avoid applying too much pressure, and his focus returned to the intense sensations. Both nipples released stronger streams that ran over his knuckles and down his wrists. Milk splashed against his abdomen, dripping between his abs and down toward his waist.

Sam stopped squeezing, but the flow didn’t stop. Instead, his tits swelled again. He stared down in disbelief as the rounded mounds pushed farther outward beneath his hands. They were filling even while they were leaking. The pressure inside them kept increasing even as milk poured from both nipples, as if his body were producing it faster than it could expel it.

“No, no, no, how the fuck are you getting bigger?” He shouted in shock, and the tits answered by growing even more.

Each tit slowly expanded against his forearms as Sam tried to lift them higher. Even with his enormous bodybuilder arms, the weight was difficult to handle. When he shoved his hands beneath the lower part, the flesh spilled over his wrists and pressed against his forearms. And all along, milk kept pouring out in white streams, splattering onto the floor beneath him.

The sensations reached overwhelming levels as the rest of Sam’s body reacted to the expansion at the front. He could feel his shoulders thickening, his traps rising, and his back widening again. His biceps and forearms gained more mass, and his thighs swelled to keep his balance. His ass grew heavier, and his hips and core strengthened, while the chest got even more absurd. The transformation was trying to support him, but every bit of extra muscle only seemed to give the tits motivation to grow more.

Within minutes, his chest had gone from enormous to ridiculous. Sam’s tits projected so far forward that he couldn’t reach around them. His huge arms had to spread wide to keep his hands against the sides. Each nipple leaked continuously, pouring milk out in thick streams that never weakened—they ran straight down, followed the curvature of the tit, dripped from the underside, and finally splashed across Sam’s body.

He pressed harder before he realized what he was doing, and milk burst from both nipples like two geysers. “Fuck!” He cried out and relaxed his hands—but it was too late.

The sudden compression had triggered a response far stronger than before. Milk covered his fingers, his hands, and most of his forearms and ran across his pecs and down his core in white trails. A pool of fresh cream spread on the floor beneath him, growing larger as more milk kept coming. And the worst part was that his tits still felt full.

The enormous tits expanded with each passing second. He tried pushing inward from both sides as if trying to contain the expansion, but the tits bulged around his fingers and kept swelling. He tried cupping them from underneath, but they were too large to support properly, especially with the skin getting slick.

Sam saw his reflection and almost laughed despite the situation. His whole body had expanded to absurd proportions, but his chest took most of the frame, pushing so far forward that they could get into a room several seconds before the rest of his body.

The pressure intensified deep inside both tits, and Sam watched them swell even faster than before. His nipples moved farther away from his body as the breasts gained even more volume. The skin got tighter, rounder, and shinier from the stretch, and milk flowed harder.

Sam tried squeezing one tit more firmly to relieve the pressure, and a torrent of milk erupted from the nipple, splattering the wall in front of him. For a few seconds, the tit softened slightly, but then it filled again as more milk came in. He stared, breathing harder and realizing that the problem wasn’t that he couldn’t empty his tits quickly enough. The problem was that emptying them didn’t matter because they were making milk faster than he could get rid of it.

Both tits continued expanding, growing larger than a pair of yoga balls, and getting fuller even as streams of milk drained from the nipples. Sam’s arms shook under the weight, and his body compensated with another growth spurt all over his muscles. At this point, Sam knew it was unlikely that he would fit through doorways, probably not even double doors. But there was nothing he could do about it as the feedback loop had locked itself in.

More tits meant more milk; more milk meant more weight; more weight forced more muscle; and more muscle let his body support bigger tits.

Sam stood in the middle of the mess, soaked from chest to waist, holding two impossibly huge tits that refused to stop filling. Even when the strongest streams weakened, milk still ran steadily. He eventually stopped trying to wipe himself clean because there was no point. The towel got soaked within seconds, and the outpour seemed to slow down.

He had asked for huge pecs, and what he had gotten was a pair of milk-filled tits that seemed to keep getting bigger forever. Judging by how they were swelling against his hands again, it was clear that they were nowhere near finished.

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PS: Plot submitted by a Support-tier member as part of the tier's benefits, along with this pic: