Timmy stood in the center of the room, his massive body heaving as his chest rose and fell with each labored breath. Jamie could see the sheen of sweat glistening on his little brother’s now-impossibly muscular frame. Timmy’s towering 7-foot height already felt unreal, but it was nothing compared to what was about to happen.
“Jamie... something’s... happening... again,” Timmy groaned, clutching his sides. His voice had deepened further, reverberating like a thunderclap through the room. Jamie froze, panic gripping him as he watched Timmy’s body tremble, veins bulging across his thick, corded muscles. It was like his very frame was struggling to contain the raw power surging through him.
With a sudden, audible crack, Timmy’s entire body began to stretch upward. His head soared higher and higher, his neck lengthening, his broad shoulders widening even further to maintain balance. Jamie stumbled back, craning his neck just to keep his brother in view. Within moments, Timmy’s head scraped the ceiling, forcing him to hunch slightly, but the growth didn’t stop there.
“Oh my God, Timmy! You’re still growing!” Jamie exclaimed, his voice trembling with fear and disbelief.
Timmy didn’t respond; he was too consumed by the overwhelming sensations wracking his body. His muscles surged outward, expanding with obscene speed and volume. His biceps, already the size of Jamie’s head, ballooned into massive, veiny globes of power. Each flex caused his skin to tighten and veins to throb violently across his arms. His triceps swelled into horseshoe-shaped slabs of pure muscle, giving his arms an almost inhuman thickness.
“Ohhh… uhhnnnn…” Timmy moaned, his voice now a guttural growl as he ran his massive hands over his body, marveling at the insane size he was reaching. His pecs jutted outward like two thick, meaty shelves, each one larger than Jamie’s entire torso. His abs grew deeper and more pronounced, forming an impenetrable wall of muscle that rippled with every breath.
“I… I can’t stop it!” Timmy roared, his voice shaking the walls. His legs were next to explode with size. His quads swelled into monstrous, vein-covered masses, each one thicker than tree trunks. His calves bulged out like iron cannonballs, straining against the skin as they expanded to inhuman proportions. Jamie’s gaze darted to Timmy’s feet, which grew longer and wider to support his increasingly titanic frame.
As his height continued to soar, the ceiling cracked under his head, forcing Timmy to crouch as he surpassed 10 feet. His body continued piling on muscle, every fiber of his being swelling larger and thicker with every second. His traps rose higher, nearly swallowing his neck, while his lats flared out like massive wings, making him appear even wider and more imposing.
“Ohhh... Jamie...” Timmy groaned, his face twisted in a mix of pleasure and pain. “It’s… it feels so good… so powerful…” He let out another primal roar, shaking the house as he crossed 12 feet tall. His cock, already massive before, began to swell with terrifying intensity. It lengthened and thickened, veins snaking along its surface like pulsating rivers of testosterone. The angry purple glans grew larger and shinier, quivering with arousal as pre-cum began to drip down in thick, heavy drops.
“Oh God...” Jamie whispered, horrified and unable to look away. Timmy’s cock now hung at an absolutely monstrous 30 inches long, thicker than Jamie’s entire arm, and covered in thick, pulsating veins that seemed alive with raw power. The angry purple glans throbbed menacingly, glistening with pre-cum that dripped down in heavy, syrupy drops. His balls swelled to the size of volley balls, hanging heavily and churning audibly with a near-unstoppable torrent of testosterone and hormones, their weight causing his already impossibly massive frame to exude an even more primal, virile energy.
Timmy’s breaths grew ragged, his chest heaving as the transformation slowed. He now stood at an awe-inspiring 15 feet tall, his head almost brushing the ceiling even in a crouched position. His body was the epitome of raw, masculine power—a grotesquely muscular giant that radiated strength and dominance. His skin was stretched taut over his veiny, throbbing muscles, and every movement he made seemed to radiate an unstoppable force.
“Jamie,” Timmy rumbled, his voice impossibly deep and resonant, filled with an unsettling edge. He took a step forward, and the ground seemed to shake beneath his massive weight. Jamie stumbled backward, his heart pounding as he looked up at his now-gigantic younger brother. “I feel... so strong... so… unstoppable...”
Jamie’s fear mounted as he noticed a strange glint in Timmy’s eyes. It was as if the sheer power coursing through his veins was beginning to take hold of his mind. Timmy’s posture shifted, his movements more aggressive, more primal. He flexed his massive arms, smirking as he admired his own obscene size.
“Timmy, snap out of it!” Jamie shouted, his voice cracking as he backed into the wall.
But Timmy didn’t seem to hear him. Instead, he turned his gaze downward, his massive cock swinging heavily as he stepped closer to Jamie. “You’re so... small now, Jamie,” he said, his voice dripping with a strange mix of amusement and dominance. Without warning, he thrust his hips forward, ramming his enormous, rock-hard cock into Jamie and knocking him to the ground. Jamie yelped in surprise, scrambling backward as Timmy loomed over him, his massive frame casting a shadow over the room.
“Timmy! Stop! This isn’t you!” Jamie cried out, his voice trembling with fear.
The words seemed to snap Timmy out of his trance. His towering frame froze, and his expression shifted from predatory to horrified. “Oh God... Jamie...” he stammered, stepping back and covering his face with his massive hands. “I’m so sorry... I don’t know what came over me...”
Jamie sat up, his heart still racing as he looked at his brother’s distraught face. Despite the sheer size and power Timmy now possessed, the same vulnerability and guilt shone through his eyes. “It’s okay, Tim,” Jamie said softly, though his voice was still shaky. “I thought for a second I lost you!”
Timmy nodded, his massive body trembling slightly as he tried to regain control. He turned away, giving Jamie some space as he tried to process what had just happened. Jamie couldn’t help but feel a pang of fear as he looked at his brother’s enormous, muscle-bound back. Whatever was happening to Timmy, it was happening fast and his biggest fear is it wasn’t over yet—and Jamie had no idea how much more his little brother’s body would change or if there was any way to stop or reverse this.