I've been reading all day, unable to stop. What a fantastic story! I love how you show the difference in Harry's relationship with Draco to his falling in love with Snape. So much fun and so much romance. The moment Harry tells Snape what he wishes for him is breathtakingly beautiful.
I love the way Hogwarts and the Forbidden Forrest feature in your story. Harry saying goodbye at his dormitory window, and he recalling the other times he had to go into the Forbidden Forrest make a great transition from canon. The atmosphere fits 100%.