After being saved from the Dursleys, the live of Harry Potetr changes drasticly. Only when he starts his studies at Hogwarts, his life begins to take a slow turn towards normal. The only question is, how do you define normal?
It isn't very often that the Dark Lord will aim to kill himself and return to fight his own supporters. This one had a huge surprise waiting when he did- and finding that Harry Potter wasn't a boy... wasn't it.
If called upon by a ritual - most demonic beings follow the call. And on the other side of the magic stands - a human being, in a trance. Their wish will be heard and fulfilled for a price - in exchange for a soul, demons play nice.