Absolutely fantastic, but please add an option to remove the mashing struggle mechanic. Mashing is a plague in action H-games, and my RSI does not need to get worse.
Aside from that, I will be following this game very closely, as it currently checks a LOT of boxes I have been dying to see fulfilled.
Edit: Made it to Wave 15. The masturbation triggers are way too common if you're just playing normally. The game at present crosses into the "frustration overrides the arousal" territory due to the constant removal of player control with the only solution being button mashing, which also has mechanics preventing even that.
Definitely love the trait system you've got the skeleton set up for, but you need a larger gap in between those moments of on-screen sex to give those traits any weight and/or value to the player. Reminds me of ErisDysnomia and Ayura Crisis, but also with those same downsides of being a chore to deal with.
QTEs, skills, etc... to reduce the frustrating aspects and minimize the literal physical pain associated with the struggle mechanic will go a long way here.