Moonlight Sonata

Remus Lupin returns to Hogwarts under the guise of protecting the students. Harry is no stranger to strange goings on and notices the signs. What will Harry find out? What, exactly, is a pureblood werewolf? Will Blaise, as a Zabini Hunter be friend or foe and how will Lucius react? DMHP Drarry SLASH! Don't like, don't read. Sirius is here but there will be some drama with him too.