I'm looking for a fic I read a couple of years back. It was a human AU with Castiel as a prisoner (I think he was in the mafia, maybe?) and Dean was a prison guard. I think Castiel had some role in the mafia or the mob and that was why he was in prison. I'm pretty sure it was a longer story, with either really long chapters or it was in separate stories, I'm not sure.
I remember that at one point Castiel uses Dean's attraction to him to escape from prison (I think he tricks Dean into his cell and after they have their fun he knocks him out and steals his keys? maybe?), and I think he winds up hunting Dean down when Dean has to leave town and get a new job, and I think he kidnaps him at one point? I know this is really vague. I'm also pretty sure it had a somewhat happy ending, with Dean and Cas falling in love and deciding to start new lives together. I want to say I read it on AOO3, and that it was a Dean/Cas big bang entry...but I can't seem to find anything when I search for prisoner!Cas or mafia!Cas that fits what I remember. Please and thanks for the help!