"Wanna see them really dwarf your cock?" Ty asked with a gleam in his eye.
Brody felt his heart flutter as his friend spoke.
"You serious?" he asked, looking down at his tiny, rock-hard erection attached to his softball sized nuts. "How ... how far can you go?"
Ty grinned. "Let's find out," he responded and knelt down right in front of Brody's teensy-tiny erection. Gently, he pursed his lips and blew, the warm air of his lungs wafting over the super-sensitive cock.
Brody groaned and felt weak in the knees as a tingling sensation went through his groin.
"Let me guess," Ty said over Brody's size-inspired moans, "you love bigger guys looking down at you, right? You kinda get off on being the super-small one that guys can look at and tease..."
Brody nodded, closing his eyes. "Y...yeah... God, I've always ... always wanted to stand out like that..."
The world seemed to melt around Brody as he blinked his eyes half-open. He looked down and saw Ty fading from sight. His balls had swollen even more, now half-again the size of softballs ... about eight inches in diameter. But he didn't have time to appreciate the view: more than Ty was fading from sight ... the whole room was vanishing to be replaced by lockers, benches, and ceramic floor tiles.
"Now," came Ty's voice, echoing softly in Brody's ears, "Whenever anyone teases you -even playfully- about your size, you'll change: your cock could shrink smaller ... your balls could swell ... or -maybe- your whole body could change size..."
Brody gulped, feeling a tingle of embarassment as he realized he'd been shifted into a gymnasium's locker room.
"And the more you get turned-on by it," finished Ty's fading voice, "the more you'll feel anything done to your cock and the longer you'll cum when you climax..."
He looked around himself and found a sign over the entrance to the locker room that said, "Out And Proud - an LGBT Gym for Keeping Fit". Brody had been sent to a gay and lesbian gymnasium with his monstrous balls and tiny cock. He swallowed, nervously, wondering what he'd do without his clothes...