~~Another good fit to your criteria that I know of are:

• Manager, please be punished (the conflict is purely internal to the MC)
• A pervert’s daily life (I have forgotten most of the story so take it with a grain of salt)

On the shorter side:

• Amaama Koakuma (A manga where the girl is relentlessly pursuing the man)~~

Edit: Oh shit, I take that back. I thought you were not that into the story lol.

A bit of spoiler, you come for the horny and stay for the story