Seeing the stone in Jon's mother's hand, Karyn quickly snatched the stone from her. Karyn thought fast, trying to think of a wish to make all this seem alright.
"I wish you would want us to have sex," Karyn (in Jon's body) said.
The stone flashed.
The expression of rage on Jon's mom's face changed to lust. "I've ALWAYS wanted to have sex with you Jon."
"Uh oh, what did I say?" asked Karyn. Apparently, when Karyn wished that Jon's mother would want him and Jon (who is in Karyn's body) to have sex, the stone changed what Karyn meant and granted the wish that Jon's mom would want to have sex with Karyn (who, again, is in Jon's body).
"How do I fix this?"