Oh my gosh, I just loved this! The way you've done the voices in this is remarkably good and their sullen and ornery personalities just shine through. I like the way you've constructed this, and I adore how you meshed it into canon so perfectly. The 'change' (if such it really was) about Snape surviving DH is totally believable. Filch's POV throughout is beautifully in character. I never thought I'd say this about a Filch fic, but I found this charming. Bravo! Wonderfully done.