Mike felt himself slowly getting shorter. "This is weird", Mike thought to himself, "Joe's taller than me, why the hell am I shrinking?"
Mike's hair started growing longer and becoming lighter in color. It brushed against his neck and slowed moved down to his shoulders, until Mike could see it out of the corner of his eyes. He could feel his muscles softening and his body getting slimmer. Mike ran to the mirror and watched in disbelief as he realized who he was becoming.
"Holy shit! Jess must have worn this when she slept over with Joe one time and since it probably got messed up with my clothes, no one ever wore it again", Mike thought. "I'm such an idiot, this was a stupid idea. Fuck!"
Meanwhile, Mike's body continued to shrink and he felt his clothes getting looser, except around his chest, where two breasts were rapidly expanding. His hips were widening and his ass swelled as well, but not enough to keep his pants from sliding down his much smaller figure.
Mike watched, mouth agape, until the transformation stopped. Where once stood a six-foot guy now stood his best friend's 5'4", blonde girlfriend.
"Now what am I going to do?", Mike said aloud, startled by hearing Jess's voice instead of his own. He sat down on his bed and tried to collect himself. Mike's first thought was excitement, as he could now freely explore Jess's body. However, that quickly dissipated and turned to panic as Mike realized his situation: He was now trapped in a hot girl's body, inside of a fraternity house, with no clothes that fit, and Joe likely to arrive before he could change back. He was stuck with few, if any, good options left.