Ok this was nice, even the fact he prefered to changed the wager to a kiss instead of body swap when he doesn't know how yet has a situation he deems to need it.
He's learning a bit more, and she's learning too. Nice to see both of them willing to be a bit more open to one another...
Now to hope the event isn't something like gladiatorial combat, and the princess feels appalled about it and the progress tumbles down the stairs...