Koji, who has been so preoccupied with work that he has neglected his married life, finally gets into a big fight with his wife. In order to repair their relationship, he sets up some reconciliation sex with his wife, who is sleeping in a sulky state. He strokes her bouncy, fleshy, beautiful ass and slides his pistons without asking any questions. He can't resist the deepest part of her vagina, which is tighter than usual, and cums inside her. "That felt so good. Now I'm going to take a shower...huh, my mother-in-law?!" After having sex with the wrong person, Koji develops a forbidden relationship with his mother-in-law...