Lay down and wait for her to get bored of the joke.

"You'll get bored of this joke eventually." You say, laying back down and pulling the covers up over you.

Jane sighs and lays down too.

Some time later you feel liquid trickling over your bottom and realise that you're peeing. The pee pools in your diaper and the padding starts absorbing it, growing thicker as it does.

"Um..." You whisper to Jane. "I think I just wet myself. I didn't even feel like I needed to pee."

"That's part of the spell. We need our diapers." She says. "I was wet when I woke up."

"You're telling the truth." You finally believe her. "Aren't you?"

"Yes." She groans. "We're stuck like this."

"And you did this?" You ask angrily.

"Yes. I'm sorry. I didn't want you to leave." She says. "Please forgive me. I can't deal with you hating me on top of everything."