Harry Potter And The Demon Seed

Non-canon; ALL our heroes return to Hogwarts following the Battle. A student who isn't what she seems tries to use extreme measures to resurrect You-Know-Who - and the Ministry misses her. I do have the ending; I tend to write piecemeal and fill in the gaps. When I can, I will. This one is VERY explicit...I'm starting to wonder about myself. :)