no idea where I read it, who is the author or title. But I do remember plot. There are 5 realms: Heaven, Hell, Purgatory, Fairy-land and Earth. Humans are slaves to everybody else. Gabriel is basically Heaven foreign minister (well, he is not called that exactly, of course). Dean is a slave. Gabriel purchases him on some auction, because he doesn't like how Alistair (or was it Azazel?) looked at him. Dean has no idea how important G. is, only that he is an angel. Time passes. They fall for each other, there is also a Stockholm Syndrome, I think. Also Gabriel buys Sam to please Dean, but soon gives him off to Castiel who is human-right activist.

It was quite long. And good.

so any ideas?

FOUND: http://scyllaya.livejournal.com/70845.html