A couple wants 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 be your partner?!" AIKA hates her father-in-law, so she angrily refuses 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. Tomorrow, on her day off...