Brad winced and then felt queasy. He looked at Carmen awkwardly, and then said, "I gotta go to the bathroom."
Once he raced there, he locked the door behind him and stared at himself in the mirror, trying to reorient himself. But as he looked into it, he noticed his face seemed to change. The thin layer of stubble along his face receded into soft skin, and his jawline itself softened.
"Wha-" he started, and then gasped as he noticed his voice's deepness had vanished, and so had the bulge of his larynx. In fact, his face looked distinctly...
A shiver in his chest distracted him, and he pulled up his shirt in time to see some more dramatic changes. His skin seemed softer and almost hairless, and he saw his nipples perk up and swell, far more sensitive than normal. He winced as around them, large mounds of flesh formed, and soon he had developed C-cup breasts. He barely even noticed how his figure had formed curves while his boobs formed.
He tried fruitlessly to forget about his new tits by pulling his shirt down over them- shivering as the fabric rubbed against his nipples- and then felt another intense twinge between his legs.
He undid his jeans and dropped his boxers to see he had an erection, and a split second later, it too transformed under the influence of the wave. His penis shrank rapidly, the sensation oddly intense as the nerves bundled up around a more confined nub. And as it shrank, his scrotum tucked up into his flesh while his testicles receded inside him. When they began to reshape, he felt himself be emasculated. He was now she, and she had ovaries that contained eggs that would be fertilised by sperm, and she was forming a vagina. Soon that slit opened out between her legs while his penis finished shrinking into her clitoris.
Brenda looked at herself in the mirror as the changes finished and gasped. She was a girl now. In boring clothes, no less.