Unlikely Heroes by KusanoSakura
http://www.fanfiction.net/s/7598990/1/Unlikely-Heroes
This is an awesome fic that is already at 61 chapters and 253,492 words and still going. It has it all magical creature inheritance, soulbonds, evil Dumbledore, stupid Ron and hot couples. I admit I have a problem with Harry being too wimpy in the overkill abuse fics. But this author has managed to make a likable character but the interaction between Lucius and Severus pretty much steals the show then you add Remus in. The hotter parts of the story are on Adult Fanfiction to avoid the story being shut down.
http://hp.adultfanfiction.net/story.php?no=600095300