"Say, Jon, how would you like to be a complete girl?"
"No, Karyn, please" pleaded Jon.
"We,, seeing as you asked nicely, Jon, I'll let you off...well, partly. Hey, Jon, nice ass."
Jon looked round as his backside became more shapely, and then he felt a strange sensation in his groin. He put his hands there just in time to feel his erect penis disappear into his body, leaving the soft moist shape of a vagina.
"What have you done?"
"Well, Jon, I thought you might like to sample a bit of the other side. So you are a girl from the waist down and still Jon from the waist up. Now, Jon, what do you want to wear...?"