I'm so sorry that I didn't get to comment on your story before the polls closed! I just finished it this morning.
Wow. This was intense. I really love how Harry is so easily played, effs everything up, knows it, and just keeps compounding it until Snape helps him pull it all back together. The sex (especially the revenge!sex) was incredible. And I REALLY liked how helpless Draco was once he'd been taken over. I want to know how he recovers from being possessed.
(The horse head made me shiver. *shivers again, remembering* So much better than a skull with a snake coming out of the mouth.) Great story!