I adore stories about WWII England, especially the people who survived the war at home -- happy coincidence? -- and the subtle change you made to Myrtle and Hooch's backgrounds was so perfect for the characters. I love the idea of Hooch as a Squib with a fixation on Amelia Earheart.
And your Minerva is a wonderful narrator. I can see the unpinnings of canon McGonagall in your teenage Minnie, and the one day to be Quidditch instructor in the large girl with her goggles and wild hair.
The minor characters, too. The boys who at first teased Hooch and then protected her when they got her on the Quidditch team. And Walburga with her fixation on Tom Riddle. A burgeoning obsession made even more eerie and creepy by what we know of her and her children in the future. No wonder portrait!Mrs Black was mad.
I really could go on and on, but I won't. I'll leave some things for people who peek at the comments first to discover for themselves.
Thank you so very much. This is such a wonderful, amazing gift.