My exact response when I remembered, reading the last line, that this post is a one-shot. Which is fitting, I guess, as it's all about 'closure'. But that doesn't mean I appreciate not getting any. And I don't think Harry and Severus appreciate it either. *HINTHINT*
That said, I like the characters in the story, because they are such a great look at how people together for a 'cause' become estranged when their focus shifts. I've always thought that Harry wouldn't really know how to be a mellow person, because as much action as H and R took on, it was always really Harry who was running around, chasing things. The war, and everything else, was really about those 'lost boys of Hogwarts', and I think your fic does a great job of keeping them in focus while showing them for what they really are.