Ok, so a a young Nanny Ogg is sent away for the summer by her parents to a distant relatives in the hills, mainly to get her away from the bad influence of her friend Esmerelda. Gytha is still pure and a bit prissy.
At the hill community she finds something strange is going on: a lot of the wives and young women are dissappearing, apparantly of their own free will, to live with the Count, a new nobleman in the district, to be his servants, fieldhands, slaves, whatever. The female cousin who had welcomed Gytha, and told her all about the Count, Expositia, soon becomes enamoured and packs her bags to join the Count. Gytha can tell there's a spell at work but can't break it.
Gytha feels compelled to investigate, meets the Count, who's a real Casanova - but is somehow odd - and is charmed despite her misgivings. Somehow, some small part of herself allows/forces her to break away and flee back to her rooms. When she examines herself she sees Esmerelda looking out, figuratively speaking.
She confers with Esme by scrying and they agree there's clearly some sex magic going on, probably Qin-qi, something that so far neither of them know anything about. Also clear was that Gytha was going to have to subject herself to the spell in order to be able to understand and counter it. Gytha's scared at the prospect and doesn't think she can do it so Esmerelda sends her some of her own strength to bolster her, she sends her own lust and desire for the flesh and all things earthy.
Gytha goes to confront the Count again
-- insert 137 pages of Qin-qi sex-magic here --
Turns out the Count was actually an incubus who had managed to cross into this plane. Gytha manages to overcome him by fully embracing her libido to such an extent that the lust
-demon couldn't keep up: she drains him dry.
All the other women come to their senses, go back to their homes, happy endings all around.
In the aftermath Gytha and Esme confer through the glass again. Gytha offers to return what Esme had sent her but Esme says "Keep it, I feel better without it", Gytha's happy to oblige: she kinda likes it
Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change? ~~ Oddball