Jake could feel the tingling spread over his entire body, filling him, becoming a deep burn within him. He gasped at the pain, but as he did, his voice began to deepen, becoming a low groan. His ten balls churned, pumping hormones through him, filling him with new sensations. His entire body grew, becoming taller, thicker, larger. His muscles swelled, and his face began to change, becoming older, more mature, and rather handsome, in an almost brutish way.
Jake's muscle growth before had been impressive, but still a bit modest. Now it was beyond that. He grew and grew, his biceps swelling to the size of juicy melons, surrounded by thick, ham-like forearms and huge, powerful shoulders. His traps were thick and hulking, reaching up dramatically to frame his thick bull-neck. Below, a massive chest pushed out from his big torso a good half foot, each huge pec jutting impressively, thick and meaty, cut with deep striations. Hard, powerful abs ran down the center of his hard midsection, and to each side, massive lats swept to each side, wrapping around to his huge back, which was a veritable mountain range of peaks and valleys. His glutes were thick and round and firm, set atop a pair of massive legs, thick like the trunks of great trees, bulging with hard, powerful muscle. He couldn't even get his heels together, his thighs were so thick and hard.
And of course, there were his cocks. They swelled as well, pushing against one another, becoming thick and long, hanging over Jake's ten engorged balls. He let out a low groan of pleasure, as lust overcame him, each cock stiffening, becoming longer, thicker, harder as blood filled them. "Oh fuck..." he groaned, surprised at the sound of it. That wasn't his voice... that was a man's voice! He looked up in the mirror, and his eyes widened at what he saw. Looking back at him was a man... no, a musclegod... In his late 20's, a soft covering of stubble on his manly jaw. Handsome, with thick hair, and piercing eyes. And then there was his body. His huge, powerful muscles, bigger than any bodybuilder's, set upon a six and a half foot frame. And in the middle of it all, five very thick, very hard cocks, above ten very big balls. Jake shuddered, and wrapped his strong hands around the mass of dicks, trying to grab them all at once. "Oh fuck..." he groaned again, as he began to jerk himself off, his brain buzzing as it was overwhelmed by the sensations of not one but five different penises. He jerked harder and faster, grunting in his deep new man-voice, until finally, his cocks shuddered and exploded, spraying jizz all over the mirror, five ropes of thick, creamy cum. Jake let out a long sigh of contentment, slowly stroking the last bits of seed out of his dicks.
He almost missed the gasp that he heard behind him.