"No thanks," you respond. "I got no balls."
"Suit yourself." Davis walks away to hang out with the 'cool kids' of the school.
You feel an odd sensation as you remember the second sentence you said. You ask the teacher to go to the bathroom and she complies. As soon as you are alone in the bathroom, you enter one of the stalls and begin to feel a change. You feel your crotch shrinking as your balls are lost, turned into ovaries. Your penis inverts with it, becoming a vagina. Your hips grow and your waist shrinks. Legs and arms become slimmer, with less hair on them. Your chest grows until you have C cup breasts, and your nipples become much more sensitive. Your face slims, and your hair grows to your back. Your clothes rip and tear into tiny pieces.
You sure lost your balls, along with much more.
You begin to investigate your new private area, and begin to moan.
"What's that?" You hear from a voice outside of the bathroom. It's Davis and his friends, and you are in the boys bathroom as a naked girl with a bunch of horny teens now.