Great story. Regarding Harry's aphasia-I really like the way you've presented him. It seems absolutely true to canon that Snape would be the one to treat him as he always has and in this case that's absolutely the best thing for him. When Snape 'translated' for Hermione, well, that was just perfect. And Snape's inability to sleep the perfect 'disease' for him. The two of them, up all night, haunting the castle-both damaged and in need of the other. Awesome story.