Cas is still on the job, you guys! Riding with an entirely new Winchester family. He pretty much as seen it all, hasn't he? I wonder if he ever looked down and saw the full picture with the little ones, BEFORE Mary was barbecued on the ceiling.
Castiel: It's very complex. If the pizza man truly loves this babysitter, why does he keep slapping her rear? Perhaps she has done something wrong. Dean: Are you watching porn? Why? Castiel: It was there. Dean: You don't watch porn in a room full of dudes. And you don't talk about it. Just turn it off. Well now he's got a boner.