The night doesn't have to be ruined, though it feels like it's tending that way.

He almost refuses, but he hasn't got any reason to. Even stubborn pride doesn't really make sense, so with a heavy breath that is only just not a sigh he turns around, shirt in hand. Thinking ahead might have saved them this awkwardness, but the truth is everything kind of took him by surprise, too, and now-- well, moping isn't going to do either of them any good.

So in the name of not ruining things, he leans in to kiss her. It's kind of like an apology. Actually apologizing seems like it would be the final word on this evening, and that's not what he wants.