Dean is hired on as Castiels sub to put Sam through school?

[potterhead2010.livejournal.com]

I read this story a while ago. Dean is part of this club thing, and asks Gabriel, who runs it, to help him find a dom. Gabriel finds Cas, and I think Cas agrees to pay him 10000 a week? I could have that wrong though.
Dean was in a bad relationship with Alastair before this and he left scars on his back. They end up falling in love, but i dont remember much of the rest of the story... Help?