"I really do think we can fix it," said Jon.
"But you can't! I tried... and wishes can't be reversed!"
"Look at it this way," said Jon. "Remember that blue branch? Well, what would happen if I wished for some red paint?"
"Red paint?"
"Yeah. I couldn't wish it to not be blue, but I could wish for something like a can of paint and use that to make it not be blue."
"I suppose."
"So we do that for your penis. I wish there's a magic, um, wand which can be used by anyone to swap genitals with someone else. I wish that the reason Karyn has a penis is that some guy has the wand and swapped with her today, but is planning to swap back with her tomorrow morning."
"Do you really think that'll work?" wondered Karyn.
"We'll find out tomorrow morning."
"I suppose. Look, I'd better go. Your folks will wonder why I'm here... I wish I was at home in bed without taking the stone with me."
Karyn disappeared, and shortly afterwards Jon's mother opened the door to look in. But there was nobody there, and Jon was in his bed, so she left.
Then, the next morning....
