Oh Capitane! My Capitane! A most excellent story. I haven't read anything this fast in my life. I had so many other things that I should have been doing, but I just couldn't tear myself away. I had to read more. I had to know what was going to happen next, and you didn't disappoint.
There's so much I loved about this story that it's hard to summarize, but I'll try. First, let me say that I loved the misdirection. I thought everyone knew that Severus was alive in his rooms and Harry and he were in a relationship. It was quite a shock to realize that they didn't know about him.
Binns was a surprise, and very well done. I like the idea of taking a tertiary character and making them realistic. You've done a fabulous job with him and the castle. I love primal, sentient Hogwarts. It reacts on such an instinctive level that it was interesting.
Harry and Snape were fabulous. For a moment, I thought Harry was going mad and that Snape was a figment of his imagination. He was so intense and focused. Snape was so real, so sad, and so resigned once he knew what was happening. I don't blame him one bit for not going back into that castle. I wouldn't be able to step foot there myself.
Harry pulled it out, and is Snape's champion on a white horse. Bravo, dear Captain! Go Dragons! ROOOOAAAAR!