Bruce can only laugh, thinking Tony's playing with him again, and he likes that, he does; it's fun, and provided Bruce remembers it's just for fun, then it's harmless. He hasn't flirted or been flirted with in so long without being afraid of the other person getting the wrong idea, but Tony understands, or he ought to, right? And Tony isn't being serious, so there's nothing to worry about here.

"Tonight will do fine," he says warmly, amusement clear in his voice. "Your room, when we get back." Tony's room, so he doesn't have to go anywhere when they're done, and maybe he's less likely to run into anything in his room.