The giant teenbeast whimpered as he frantically looked around for a way out. If his da- er, if Coach found him, he'd be so screwed. What if Coach made him grow even more?! Russell gulped and closed his eyes, envisioning himself as he once was, a skinny, little, gay nerd. Yeah, that's who he was. He'd escape and find some way to turn everything back to normal.
He looked at the open window. He faked it before, maybe he should do it for real this time? He shuffled over to the window and opened it to its fullest. He stuck his head out and-
"No!" the big brute hissed under his breath. His massive, musclebound shoulders snagged on the edges of the window's frame. No matter how he struggled, he wouldn't be able to get through, his muscles simply being too large now. The newer, jockish personality growing inside him reveled in this. His ultra-thick shaft sprung to life, his titanic 14" slamming into the wall below the window and slathered it a generous coating of his godly pre-seed.
"No, no, no," he whined, his voice rumbling in the air. He quickly rushed the door and slammed it shut. 'Oh fuck, are you a dumbass or what? Coach definitely heard that!' he screamed in his head. The footsteps downstairs suddenly shifted and Russell could hear the stairs creak as someone ascended them. He put his giant back against the door, the sides of the frame digging into the middle of his lats. He slumped to the ground, causing it to shake and let out a low groan. 'I'm fucked,' he resigned.
Tears began to form at the corners of his eyes as he heard the steps getting closer. He tilted his head up, ready to give up. But not before he gave in. His eyes fixated on the posters on his walls and a serene calm washed over him. 'Boobs are nice,' he thought to himself, a dopey grin forming on his face. His hands shot down to play at his engorged length, so thick he couldn't get his fingers to touch his thumb anymore. He began to stroke at himself, his worries melting away. What was he worried for to begin with? All he could think about was stuffing his wine bottle-thick cock in between a supermodel's perky breasts and cumming all over her gorgeous body.
"Mmmhmm, yeah," he rumbled, a jet of pre-seed splashing out, shooting halfway across the room. He kept staring at his posters, a goofy look plastered on his face. A heavy knock on the door jars him out of his sex-addled stupor.
"Russell? You in there, boy?" Coach boomed on the other side. "Come out, sport," he breathed heavily.
"Ungh, in a minute, Coach. I'm busy," Russell moaned back. He let out an almost bovine cry as his bull's equipment spasmed and a geyser of god-seed erupted from the tip as he double-fisted his donkey-dick furiously. He could barely make out a snicker on the other side of the door as he lost himself to yet another powerful orgasm.
As he shot load after load of gooey white seed across the room, the first few shots shooting right out the open window, he felt his body responding to yet another growth spurt. He felt his arms, pistoning against his shaft, grow thicker. Starting at his forearms, striations exploded and then softened as thick body hair grew in. His hairy biceps and triceps exploded with size, hairs going in erratic directions as the veins carved their way through the surface of his skin. His impossibly wide shoulders got even wider, now twice the width of the doorframe to his room. His pecs jutted out further, a dense forest of chest fuzz turning his skin darker. He chest was so thick now, it rivaled some of the largest boobs he'd started to fantasize about, but his were filled with rock hard meat, the nipples practically forced inwards due to his supreme bulk. His abs stayed tight, he couldn't see them but he could feel them up, all eight cobblestones present as he felt himself up. Though, they did seem to bowl out due to the sheer muscular overdevelopment taking place all over his body. His glutes pushed the rest of his body up as they expanded. His legs were forced apart as his quads developed into tree trunks, his hairy calves never to touch each other ever again.
After what felt like a minute, Russell let out a happy whine as the last of his seed dribbled out the tip of his spent length. He playfully cupped his massive balls and rumbled. He could definitely go again.
"You done in there, sport?" Coach grunted.
"Yeah, Coach," Russell replied dumbly. He wasn't thinking straight, if he let Coach in, this was the end of his nerd-life permanently. He stood and instantly felt a sense of vertigo; he'd definitely gotten even taller. Coach opened the door and the look on the man's face was priceless. His son had transformed into a veritable god of muscle and sex. Russell's neck had nearly entombed his head, but his visage was strikingly masculine, his strong brow and lantern jaw gave him the barbaric look that would intimidate the entire opponent's squad.
Russell winced as the final step of his transformation took place. His cock pushed its way out further, the organ thickening obscenely. New veins poured themselves onto his shaft. His balls bloated even further, quickly filling themselves to the brim with potent jock-god seed.
"Holy shit," was all Coach could say.
Russell was almost proud of his latest transformation. He had the body any jock would want, stronger and bigger and more potent than any other male on the planet. 'Fuck yeah,' his inner-jock told him. But as Russell looked at his father's face, that devilish grin spreading on Coach's mouth, the last vestiges of his nerdsona told him to be worried...