Jon thought. She wasn't sure. Eventually she asked Karyn for help and they tried thinking up a good reason.
But there wasn't a reason that made any sense. Yet Jon still got an idea.
"I have it!" exclaimed Jon. "We can't explain why I turn into a girl when I think of telling someone about Sarah's powers. But maybe we can explain the other stuff. So instead of explaining away everything, we undo the first part and explain away the rest."
"But... we can't undo wishes. You said so. Right?"
"But we can reinterpret them! I wish that since Sarah has no powers now, her wish about telling people about her powers has no effect." Jon and Karyn had to look away, a sure sign that the wish worked.
Just in case, Jon said "I wish we knew if that wish did what I wanted." It did.
"All right," said Karyn. "What's the explanation for why we have children, you're a girl who's going to change back to a guy tomorrow, and you're pregnant?"
"Hmm," said Jon. "We adopted the children?"
"I don't think so," said Karyn. "Sarah wished that you'd give birth. So you can't wish up any explanation that doesn't have you giving birth in it. Besides, it doesn't explain the pregnancy."
"Well, how about this..."