Oooooo! Snape/Black is my OTP. I could eat 'em for breakfast, lunch, and dinner.

established, committed (but still snarky as hell) relationship
intellectualism
one being made to watch the other wank
spankies
occasional 3somes w/Lupin, just to liven things up a bit
Snape grudgingly caring for Padfoot
forays into the most mundane parts of the Muggle world (Walmart?)

I can't wait to read the finished product!