The beloved wife Ai Yina who has been fallen to the heart ・ let me sleep of betrayal

The protagonist, Katagiri Hirotaka, married his wife Katagiri Aiina when she was only 20 years old at the time 8 years ago.
However, Hirotaka, now in his 40s, is shocked that his physical strength and energy have waned.
When I consulted a doctor, the cause was mental, and it was recommended to get stimulation by rut measures.
However, I tried various things such as watching AV with my wife, but it did not lead to problem solving.

One day, he reunites with Shoji Soma, a former under-secretary who took care of him a long time ago, and he hit it off.
And after he lost his wife, he hears that he is participating in a certain couple's sexual activity, playing cuckold and eliminating sexual desire.
I show interest while being surprised that a familiar acquaintance had done such an act that there was no edge at all, and when I see a cuckold AV that I had not seen until now with my wife, I am wrapped in a mysterious excitement.

From there, his interest in realistic acts gradually swells, and in order to get sexual stimulation, he asks him to participate in a pseudo-cuckold play against Ai Yina.
The pseudo-act was about caress, but it succeeded in causing excitement, and the sexual act of the couple is very excited.
After that, he wanted to seek stronger stimulation and, with the consent of his wife, he asked for more intimate sexual acts.
It was because I trusted Shoji, and he responded to it ...."

主人公・片桐博隆が妻・片桐愛依奈と結婚をしたのは彼女が当時まだ20歳だった8年前。
しかし今、40代になった博隆は体力、精力が衰えたことにショックを受ける。
医者に相談したところ原因は精神的なものであり、マンネリ対策で刺激を得る事を推奨された。
しかし妻と共にAVを見るなどいろいろ試したが、問題解決には至らなかった。

ある日、昔世話をした元部下の相馬彰二と再会し、意気投合。
そして彼が妻を亡くした後、とある夫婦の性行為に参加し、寝取られプレイをして性欲を解消していることを聞く。
全く縁が無かったそんな行為を身近な知人がしていたことに驚きつつも興味を示し、今まで見ていなかった寝取られAVを妻と見ていると、不思議な興奮に包まれる。

そこから次第に現実的行為への興味が膨らんでゆき、性の刺激を得るため、彼に愛依奈を相手にした擬似的な寝取られプレイに参加してもらうことを依頼する。
擬似行為は愛撫程度のものだったが、興奮を起こさせることに成功、夫婦の性行為も非常に盛り上がってゆく。
その後、より強い刺激を求めたくなり、妻の同意のもと、さらに密接に触れ合う性的行為を依頼してゆくことになる。
それは、彰二を信頼してのもので、彼もそれに応えてくれていたが――。"