Fortunately, Jon still had the stone. "I wish that the two people who Karyn turned into keep Karyn's memories."
Nothing seemed to happen other than a flash and having to look away, but suddenly both of them stopped. Jon's mother took Jon's hand out and Jon's father pulled away from Jon.
"I remember now!" said Jon's father. "You transformed me and I forgot...."
Jon hadn't been sure it would work, but it did. With Karyn's memories, they'd recognize the situation is strange and act accordingly. Karyn transformed into Jon's father would understand that having his father jerking him off wouldn't appeal to him and wouldn't do it. Likewise for his mother.
"But I forgot until the second wish," said Jon's mother.
"God, I must have freaked you out," said Jon's father. "I want this too but we can't do it like this. How about when I get back to normal, okay?"
"Um, sure," said Jon. But how would he get them back to normal?
There were the sounds of a key at the door. "That must be Zoe," said Jon's father. "She forgot her lunch... Wait a minute, I just remembered that... I think I know a little bit of what your dad knows."
"Yeah," said Jon's mother. "We'd better be careful to make sure Zoe doesn't notice." Then they both fixed their clothes and left, but not before Jon's mother gave him a kiss. It felt almost like a motherly kiss; maybe Karyn would be able to pull it off while Jon figured out what to do.