I definitely second this (fabulously-written) rec! As you've perhaps seen, I've written a long comment, but I've recced this fic only privately to therealsnape. Could have recced to you, but I suspected the MA were you! There is something about these older ladies and perhaps also some other fascinating (or irritating) adult canon characters that helps make fics truly fun and excellent in every way. Or perhaps it's something about the writers who prefer these characters?