oh wow. I totally like this. Old-woman-sex. Now there's a final frontier...
Your characterization of Sybil has won my heart. I love the digressions, by both of them, but especially how Sybil rather rambles off in toomanydirections, while Minerva is ever the schoolmarm editor, getting those details right (with a bit of scolding tone).
Their surprise, and tentativeness. Their gentleness. The way their practicality is also a deeply symbolic sentimentality:
Sybil realizes that they don't need a cat in the house because Minerva is enough.
"My watering can isn't silly," she says, still moving, still reaching for and pushing and pulling against Sybil. "It's functional."
I think this story is functional in the same way - the way Minerva is (and Sybil has always tried to be). Romance (take that, Filius!) is a real need (even for old women).
This story/pairing/Sybil wasn't one I'd usually read ... but I'm so glad I did. It takes me to a real and happy place.