For the record, I am KICKING MYSELF that I didn't guess that one was yours. But you are such a chameleon, it's really hard to pin you down. But the breezy cleverness should have been a giveaway. I initially strongly suspected you for Case-by-Case Basis, but once you commented on that I had to go back to the drawing board!

But this just leaves me opportunity to re-read and re-comment when it moves to AO3, so actually we're all winners here :)