But Who Guards the Dragon?

This is an expansion of my one-shot, It'll be Okay. You don't have to read it first, it will be in the story. Requested. DMHP Sub/Dom relationship. Slash. Don't like, don't read. Harry thinks a few thinks through, then comes into his creature inheritance. He finds out that he is the dominant mate to one Draco Malfoy. But things are never easy for the boy who lived. post OoP (yr5)