Looking for books where the mmc has a Completely different personality behind closed doors.

After reading {Dead of Summer by AJ Merlin} I found myself missing that dynamic in the books I read after. I'm looking for an MMC that is basically a golden retriever guy to everyone's face, and then once he's aalone with the face I want it to be a complete flip of a switch difference in personality.

Bonus Points for: -Stalking

-Non Con