I'm loving the dynamic. Even he can't begin to imagine just how her mind works :D This is at least 7 years she's been helping out with fighting and Slayers and demons and the like, so her view of good and bad certainly isn't quite as black/white as Buffy's. She's impossible to predict.

To be honest, I never saw this coming, especially not with this much force behind them, and it's taking all the restraint of both of them not to actually do something right there and then.