Oh wow, wow, this was so good! The senile furnishings/fixtures were a wonderful touch, as were the perfumes. Gorgeous details :).
I laughed out loud when the discussion on the Gryffindor penchant for naming things after the deceased was followed by Minerva's letter mentioning the thing named after Dumbledore. The kids were great. There was so much in this! I thought it was completely wonderful.
And there's something tantalisingly familiar about your writing, so I'm very keen to see the reveal for this one :).