The Doctor's sudden appearance more than takes care of anything Kaylee was about to say. He's perfectly right--it'll be a fantastic learning experience for everyone involved, and there will more than likely be a way to annul any marriages that people don't want to keep afterward.

"Sure we'll learn plenty, even if it'll be awkward for most. Don't worry so, Jamie."

At the Doctor's last question, though, Kaylee could only stare at Billy for a few seconds before bursting out into giggles again. "'Fraid not. Billy's got himself a gal already~"