Gibo no Toiki: Haitoku Kokoro ni Tadayou Haha no Iroka  

Do You Know the Milfing Man?, Sayo the beauty, 義母の吐息 ~背徳心に漂う母の色香~, 義母の吐息 ～背徳心に漂う母の色香～

When Kaito's mother dies and his father remarries, he develops feelings for his new stepmother, Sayoko. Overwhelmed with desire, Kaito begins to secretly observe her and eventually sneaks into her room at night for illicit activities. Despite feeling guilty, Sayoko eventually agrees to participate in the affair. And when Kaito reveals that his father is having an affair with a younger woman, their relationship becomes a full-blown affair, causing chaos within the household.