The Kasaharas and their father-in-law, Takeo, are living together as a two-generation household. One day, Aoi, the daughter-in-law, enters Takeo's room to find him in the middle of masturbating. Aoi hurries out, but is Kokoro by his magnificent penis... Telling herself that it's just a way to release her daily frustrations, she masturbates while imagining his cock. Noticing this, Takeo takes advantage of Aoi's opening and forcibly kisses her. She resists, but her hidden desire cannot resist the physical pleasure, and before she knows it, she accepts Takeo's tongue...