Worried about my pregnant wife, my mother-in-law, Rinka, came to Tokyo from the countryside. I thought that her support would help ease our relationship, but when we brought up the topic of masturbation, my wife's anger escalated. She couldn't stand the fact that I was the only one suffering, and even banned me from masturbating. A few days later, while I was feeling frustrated, I happened to witness Rinka's naked body after a bath in the changing room. Worried about my unusual behavior, Rinka listened to my story in detail...