Looking to pop my Castiel/Dean cherry

[eosrose]

I'm a pretty avid Sam-girl, so I haven't paid much attention to the Castiel/Dean ship except on those occupations where it's appeared as a side-story in, say, a Sam/Gabriel story. I'd like to try to change that. Please rec my your favorite Castiel/Dean fics! Convert me, if you can. :P

I tend to prefer:

• AUs. Give me your werewolves, your vampires, your God!Castiel, your demon!Dean, your office dramas.
• Not-so-innocent!Castiel. Is it weird that I want a Castiel who knows what he wants and goes for it? For example, if we're talking a Werewolves AU, Castiel would totally be Alpha. Role-switching is cool, but I'm rather fond of the idea of Toppy!Cas.
• The longer, the better. I want something I can sink my teeth into.
• Sam is not the enemy. If Sam appears, no character assassination, please. Actually, I'd sort of love it if Sam helped get them together, lol. Matchmaking!

So, yes. Suggestions, please! Where do I start?