First of all, amazing work, well done!
I can structure my suggestions in three sections: (1) story evolution, (2) game mechanics, (3) audio/visual.
(1) Story:
* I see four paths: 1) faithful wife, 2) open relationship or cuck, 3) corporate slut, 4) blue-collar slut
* Some side-stories, like Dylan, Nathan, Shelly's college brat nephew, plumber, gym instructor...
* Some level of danger and moral questions with each story track
(2) Mechanics:
* Puzzles - like trying to find a key, a document at the office - each one unlocks some hidden videos or renders
* Mini-games - for example, during the dance with Justin, some mini-game that determines how lewd the dance gets (and what happens afterwards)
(3) Audi / Visual
* Keep those fluid videos coming - use them for all the lewd scenes
* Introduce voices / speech
* Get those moans and sighs to the next level