drunken sex
I have friended you-- I hope you don't mind. As for drunken sex- in my experience that's about the way half the world seems to get together the first time. And given how hard it would be to get these two together in the first place it seems a given. From what I have seen, even the smartest people often wind up in bed like this. After the war, when Snape no longer has to spy, wouldn't he let go some times in the way of spirits. Scots and English drink a lot in my experience.