Thank you so much for this story. It includes so many of the things that I love about both of these characters.
I love the idea of a post-war refugee camp being placed at the dragon reserve for all of those people, like Snape, who don't have a place in a post-war Britain. And that Charlie doesn't take advantage and doesn't tell Snape that he's running it, or that he knows who "Monkswood" is until after Snape gets his papers, is so perfectly Charlie.