Welcome. Idk if you'll like it, since it has kinda a happy ending.
Edit: The Lion and the Serpent (http://www.fanfiction.net/s/4061761/1/The_Lion_and_the_Serpent), by Emily Waters, on FF.net. Also slavefic, also Harry being the master.
Not a slavefic, but you might like to read ERISED (http://aoifene.livejournal.com/91810.html), by aoifene, and it's sequel DESIRE (http://aoifene.livejournal.com/147153.html). You'll have to friend her though, leave a comment to this entry (http://aoifene.livejournal.com/7453.html) and wait for her to friend you back. The fics are worth it. Also H/D... well, I think that'll be all you'll get from me :P
no subject
Edit: The Lion and the Serpent (http://www.fanfiction.net/s/4061761/1/The_Lion_and_the_Serpent), by Emily Waters, on FF.net. Also slavefic, also Harry being the master.
Not a slavefic, but you might like to read ERISED (http://aoifene.livejournal.com/91810.html), by
I'll be editing as remember others.