Keith reached out with his right hand and began groping one of the bare-chested babes, Julie, as she began feeling along his muscular arm. She squeezed, but couldn't hurt his steel-hard bicep, then he flexed it for her. The large ball of muscle jumped out and Julie gasped, "Wow. You're so strong."
"Fuck yeah," replied Keith in a cocky tone. He pulled away from her breast to fully flex bot his incredible biceps. His arms looked even bigger. "Go ahead and feel em'." He smirked and looked at his own impressive limbs. 'They do look bigger,' he thought.
While Julie continued to worship his bulging right arm, the other girl, Lindsey, began making out with the football stud and teasing his large nipple at the same time. Lindsey straddled his wide left thigh and pressed her big, round tits against his hard chest.
Suddenly, Keith felt very uncomfortable in his jeans. He pulled his tongue out of Lindsey's mouth long enough to say, "Julie, my pants are getting tight."
Lindsey placed her hands on his thick right pectoral and moved her hands down his cut-up six pack to his sick atlas lines. She began anxiously undoing his pants and pulled them down, only to be pleasantly surprised that the muscle jock was going commando. Keith's thick cock sprang up to a full ten inches and throbbed with as many veins as his vascular arms. The wide root was hidden by a substantial forest of black hair that was framed by his incredibly muscular thighs.
Julie gasped at this porn-star sized dick. "Oh my god. You're big," she said, sounding incredibly aroused.
"Hell yeah, I am," said Keith who was too entranced with Lindsey, now also pantless, to notice he was a good inch longer than usual. Julie stood up and lowered herself onto his beastly manhood. The stud closed his eyes and let out a long deep moan as Julie began backing his cock in and out. "Fuck, that feels sooo good." The feeling of his fat head deep in her pussy made her gasp loudly as she attempted in vain to take it all.
Lindsey then climbed onto Keith's beefy chest, her legs spread-eagled by his now wide lats, and continued making out. But the jock was moaning so much from being fucked that she simply moved to sucking his neck. It was only then that she noticed her legs being spread further. She felt his pecs slowly grow into large steel plates, pushing her body further from his mouth. Her hands held onto his widening shoulders, and she clearly saw his large traps encroaching on his thick neck.
Meanwhile Julie continued without success to reach the base of the Keith's growing muscle cock. The waves of pleasure were so intense she couldn't even concentrate completing her self-appointed task of fully stuffing herself with his tremendous manhood. "OH FUCK. I feel so big. So buff. I'm a huge fucking stud. Yeah." The young bodybuilder grunted, ejoying but still oblivious to his new size. Beneath her, Keith's balls inflated to the size of oranges and his immensed thighs became so defined the teardrop shape grooves were deep valleys.
The girls slowly became aware something was wrong. Keith had started out as an average jock, but was now a 6'6" heavyweight bodybuilder with a thirteen inch cock. The beastly muscle teen moaned louder as he felt Julie's pussy growing smaller and smaller around his ever expanding monster. "Oooh. So Fucking TIGHT. I'm too fucking BIG. Yeah. Huge Muscle jock."
Lindesy looked down and watched as his shelf-like pecs ballooned out, the cleft between them was deeper than her own double-D cleavage. His massive shoulders stretched to five feet wide, close to the size of bowling balls now. She felt his expanding abs pressing hard against her naked butt. His huge lats continued to push her legs even wider and his head began slowly growing further away. His size thirteen shoes explode off his humongus feet, but Ty wishes that no one would notice.
Julie sat on his immense thighs, having given up taking Keith's now 15 inch sausage, but still leaving 9 inches inside her. The feeling of his growing cock was intensed, but apparently not intense enough for the muscle jock. Keith began thrusting his enormous, muscular haunches, lifting Julie higher into the air. Wracked with pleasure he reaches up with his enormous arms and grabs hold of Lindsey. She looks down and screams. His arms are now gigantic. His thick bulging forearms are as wide as her thin waist and his bicep peaks are easily 28 inches.
The scream wakes Keith from his pleasure dream and he lets go of Lindsey who scrambles down off his cobblestone abs just as the toilet collapses under the muscle giants steel-hard ass. Keith looks down at his 7'3", 400 pound body and grins. "Shit, I am fucking huge. I'm a FUCKING MUSCLE BEAST," he yells. He briefly notices Julie, still thrust upon his 20 inch member, now looking terrified. He ignores her and begins flexing and feeling his huge muscles while Lindsey cowers in a corner. Keith's muscles are so massive that he takes up most of the restroom.
The giant bodybuilder then stands to his full height, his head close to the ceiling, with Julie still impaled on his monster actually suspended in the air. Keith begins to flex his huge body. Hitting a double bicep pose, he laughs at the enormous muscle peaks which are bigger than the girls heads. "OH FUCK," he booms. "I'm so FUCKING HUGE. I'm the biggest fucking jock on the planet. I love being such a HUGE FUCKING MUSCLE GIANT."
He works himself into a flexing frenzy, actually getting turned on by his new size as his body continues to expand. The biggest bodybuilders would look like children compared to him now. Despite being in severe pain and incredibly terrified, Julie can't help but admire the massive chest that takes up her entire view; his gigantic pecs each the size of a watermelon with silver dollar nipples, bounced with every flex. Her palm was the size of any of his amazing 10-pack.
As his head began pushing against the 8 foot ceiling he shouted, "OH FUCK. SO FUCKING MASSIVE. YEAH. OH, GONNA FUCKING CUM." HIs giant muscled frame exploded with veins and pumped up to unbelievable proportions as his entire body flexed at once. His orgasm was so powerful it actually launched Julie off his monstrous cock and sent her into the wall, consecutively washing her with his two foot fire hose.
As the giant muscle hottie pressed harder against the ceiling, Ty decided that was enough and wished for the growth to stop. But Keith continued to expand, in fact his enormous muscles were growing faster now that he had climaxed. Ty realized that he had wished for Keith to finish with both girls, and he'd only actually had sex with Julie. As Lindsey ran screaming through the ghostly Ty and out the door, he gulped. Turning around he saw the teenage muscle god crash through the ceiling.