Karyn decided rthat as long as Sarah couldn't talk, she was the only one who could wish.
"I wish that Sarah and I reversed roles of the body, as she will now be a mute asshole and I will be in control, but will not be unable to talk and make wishes." The stone flashed, and Karyn now saw that she was Sarah, and was going to have some fun with this. She turned to Jon and said, I wish you didn't remember the past few things who transpired.
Jon did a double take, and asked Sarah, "Sarah, where did Karyn go, she was just here."
"Oh hey there Jon," said the supposed Sarah, "You know that I have always had a crush on you, but have never been able to say so as you were unpopular, you and that Karyn chick. Do yah wana make out?"
Karyn waited for Jon's reaction which was...