Were they not playing that game? No time for doubting himself, and Crowley looks pleased anyway. That's probably his first clue that he's wandering into territory he shouldn't want to be in, but he ignores that for now because he needs to figure out what comes next. This is a game, and he intends to win... or something.

"You do tend to forget your place." Get it, because Castiel's planning to backstab him later. There's something else he doesn't need to think about right now. He's just a demon. The king of Hell, at that. Castiel doesn't need to worry about his feelings.

What is he going to do? He can start by giving orders and hope Crowley obeys them. If not, what? Spanking, like the babysitter?

"Finish taking off your tie. Then your shirt." That's a start, and maybe some stalling.