Eric held the stone in his hand. "I wish that you, Keith, were my attractive girlfriend Kathleen, completely in love with me and happy being a girl, but that you're otherwise still just like Keith."
"What are you--" said Keith, and stopped. The stone did its work and where Keith stood was now a girl in a slightly different sized version of Keith's clothes. She had Keith's short hair, but large breasts and a great figure--as much as could be seen through a lab coat, anyway.
She blinked.
"Kathleen?" said Eric.
"Yes, it's me," she said. "I'm a girl now. It feels so strange."
"Do you mind being a girl though?" asked Eric.
"It's a little bit of a mean trick, but I don't really mind. I wouldn't be able to be your girlfriend if I was still a guy, now would I? God you're so hot... You know, because I've just become your girlfriend we've never gone out anywhere, or done much together."
"Well, how about we do something later."
Kathleen grinned. "I have something in mind. If you don't mind my being in a shirt and pants."
"I could wish you up a dress."
"But I don't like dresses. Anyway, that's for later. So what are we going to do with Jon? We were going to do an experiment."