Otto no Shin'yuu no Chi*po o Kuwaeru Inran Bakunyuu Tsuma Fujii Yukari

A cold married life... Tomokazu secretly takes peep films in the bedroom of a married couple, out of distrust for his wife, Yukari. In the bedroom he finds Yukari with his friend Tsuguhiko. Anger and irritation awaken a new kind of emotion inside Tomokazu. It's arousal at having his wife have sex with other men!

[From DLsite English]