The Tachibana couple want to have sex, but the husband is busy and it's difficult. After the husband goes to work, the father-in-law suddenly comes to visit. Eavesdropping on the couple's conversation, the father-in-law suddenly shows off his dick and asks, "Are you having sex? Shall I have sex with you?" Hinata, who hates her father-in-law, angrily rejects him and kicks him out of the house. However, she can't forget her father-in-law's big dick and masturbates while thinking about it. She believes that tomorrow, on his day off, Shinji will have sex with her!