This was such powerful story in both the telling and the characterizations. I loved that Binns was so intimately connected to the castle, and his relationship with Severus made me smile.
I really loved the incorporation of the school's motto, and how it had a deeper meaning. Very crafty of you!
Harry though... Harry blew me away. His optimism, Gryffindorish determination, and bravery in confronting the castle on Severus' behalf, the made my heart soar. I love a good, strong Harry who can handle Severus, push him that little bit further, and your Harry did all that while still being able to show how much he cared.