Found the save folder. Here's the bugged save file in case you want to verify.

https://drive.google.com/open?id=1ZK25S ... VSg1olpR38

Latest Steam version as of today. I decided to try Madison's "muse" quest. It went well, right up until I had us both standing naked in the bedroom waiting for sex. No "Fuck" option appeared in the radial menu.

Choosing "talk" only gave something like "Madison bites her lower lip and gazes poutily ...