Kanojo no Seiheki -Touchou x Mousou-

Synopsis

The protagonist, who works at a company in Hebizuka city, started dating a colleague called Koimori Moeka. After having sex with her at a hotel, he notices her phone was in recording mode and Moeka reacts erratically when asked about it. The next day, he goes to a store that sells listening devices to try and understand why Moeka behaved the way she did. He learns that she has a fetish for sex sounds and sometimes gets aroused listening to them. When he meets her again, he apologizes for his behavior and tells that he loves her and wants to accept everything about her, even this fetish. Moeka had been struggling with the idea of suppressing her fetish but the protagonist's acceptance helps her come to terms with it.