It was an AU, I believe it was a Roy/Ed fic. I believe the plot was that Ed was a slave, it was kinda set more in a Victorian setting. I think a brothel bought him, and if I remember correctly Roy was working with the brothel or went to visit and he found Ed, there was a lot of intrigue and mystery to it as well. And I think there was this big plot to get Ed out of there.
I think it was a gen fic, no sexual situations but of course adult because of slavery and abuse and such. (I could be wrong about that)
It was definitely a multi chapter fic, i am not sure if I read it at ff.net or here on LJ, it could have been either.
I know that isnt a ton to go on, but maybe someone remembers it? It could have been 3-4 years ago so it is a long shot, but if anyone has any guesses to what it might be, I would love to hear.
Also, on an unrelated note, There is a fic from the ever awesome Corner of Madness (D. M. Evans), it's called "If Happiness Forgets You" I wont give away the plot, but if anyone knows any other fics like this one, where a certain person who was supposed to be dead suddenly pops up as very much alive, I would love to read it. So far as I know, this is the only fic that uses that idea.
Thanks in advance for everything!