In Search of Dean/Cas...

I've been wanting some slash of these two forever, but after tonight's episode, I need it desperately. The looks Cas kept giving Dean, Dean's saucy comments. Problem is, I've only ever read Sam/Dean and only a little of it, so I don't even know where to start.

Someone rec me, please. I prefer cannon stuff, but AUs are okay, too.

ETA: I'm still trying to think of a way that the word "erotic" can be applied to a relationship between brothers that isn't seriously wrong. Are the writers *trying* to make Wincest cannon. God knows it wouldn't be the first time...