A Modern Tale of Betrayal (M looking for F, cheating, older woman)

[Blandlytasteful]

I'm interested in a scene where a young man's girlfriend (or possibly wife) has a very spiteful relationship with her mother.  She regularly complains about her, and among other things, one of her complaints is how promiscuous the mother is.  She'll just do anything, with anyone, she's basically a nymphomaniac.

Well... As a guy who's been getting less and less sex, who has always been interested in kinkier, rougher play than the vanilla he's been getting, her partner is considering finding out how accurate all those complaints are.  Hopefully very.