My mother-in-law, Ririko, came to Tokyo from the countryside, worried about my pregnant wife. I thought my wife's stress would be alleviated thanks to my mother-in-law, but my carefree attitude backfired and angered my wife. Furthermore, I was forbidden from masturbating because she couldn't stand the fact that only I was getting pleasure. A few days later, while sniffing Ririko-san's underwear with a frustrated feeling, I was seen. Ririko-san, who had heard our argument, proposed, "Perhaps I should take her place...?"