Propensity of girlfriend - Eavesdropping × Delusion-

The main character, who works for a company in Serpigahara City, begins dating "Ko Imari Moeka", a colleague of the company.
I felt a sense of incongruity to MOEKA who was invited from MOEKA unusually and went to the hotel on the way home from the company with two people and went to the hotel to do etch.
After the sex is over, the smartphone is about to fall from Moeka's bag headed for the shower and suddenly notice that it is in recording mode when you look at the screen.
When I ask MOEKA who returned from the shower for the reason, she is distraught and hurriedly goes out when she wears clothes.

The next day, Yuta, who was worried about Moeka who was taking a break from the company, stopped by to find a shop dealing with eavesdropping equipment on the way home from the company and might be able to grasp the reason for something once.
The name is explained that there is a propensity to have hidden in people when talking about the other day's etch, and it is sometimes excited to hear the voice of sex.
The next day when I went to the company, Moeka came to work, so I called out that I had a talk on the roof during lunch break.
When Yuta is waiting on the roof, Moeka appears and Yuta apologizes that she was bad, and says that she wants to satisfy your propensity because she loves it.

Moeka is said to have been worried that his propensity is abnormal, so he should be sealed forever.
However, Yuta says that she wants to accept everything because she likes it.

蛇が原市にある会社に勤める主人公は会社の同僚の「古伊万里 萌香」と付き合い始めた。
萌香から珍しく誘われ二人で会社帰りにホテルに向かいエッチをするとやたらとよがる萌香に違和感を抱いた。
エッチが終わり、シャワーに向かった萌香のバッグからスマホが落ちそうになっており不意に画面を見ると録音モードになっていることに気付く。
シャワーから戻った萌香に理由を尋ねてみると取り乱し慌てて服を着ると出て行ってしまう。

翌日、会社を休んでいた萌香が心配になった佑太は会社帰りに盗聴機器を扱っている店を見つけ何か理由の一旦が掴めるかもと立ち寄った。
名前は伏せて先日のエッチの話をすると人には隠し持っている性癖がありセックスの音声を聞いて興奮することもあると説明される。
翌日会社へ向かうと萌香が出社していたため昼休みに屋上で話があると声を掛ける。
屋上で佑太が待っていると萌香が現れ佑太は自分が悪かったと謝り、大好きだからこそ君の性癖を満たしたいと話す。

萌香は自分の性癖が異常だから、永遠に封印するべきかもしれないと悩んでいたという。
ただ佑太は好きだからこそ全てを受け入れたいと話す。