Yuya has liked Kokoro since elementary school. Recently, they meet again by chance, and if they confess their intentions, they will be dating. In fact, Yuya's father was a teacher, and had once been in charge of both of them. Yuya brings Kokoro home and lets her see her father again as a lover. However, she doesn't notice that her father's obscene gaze is glued to her heart's grown-up big tits. His father, who called him to ask for advice about Yuya, innocently believed in his teacher and forcibly pushed him down with an aphrodisiac in his heart.