Jon looked at his newly-feminized genitals and cried "Oh no! I'm a freak!"
Karyn said "No, I'm sure we can figure out how to fix this. We can't undo a wish, but maybe we can figure out how to change things so that the wish could have come true in a different way!"
Suddenly Karyn had a sinking feeling in her stomach. "The stone! I left it in the classroom! Jon, wait here while I run and get it..."
With that, Karyn dashed out of the bathroom, leaving Jon trying to soak up the blood from his new anatomy with a wad of toilet paper, wondering what the hell he was going to do.