I think the subject line is pretty much all I have to say about it... I know I read this a year or so ago? I want to say Dean's hunting on his own and he picks Constantine up hitchhiking, though I could be totally wrong about that. Sex ensues; that much I know. And I would have sworn I'd bookmarked it, but I can't for the life of me find it. Help?

ETA: Found, in first comment. Posting from mobile so please forgive lack of link.