Yumi, who is in financial trouble, starts dating a sugar daddy. Trembling with anxiety and tension, she meets a man and has sex with him at his house, but as he carefully stimulates her nipples, she gradually begins to feel a different kind of pleasure than usual. The endless whole-body stimulation makes her sensitive all over, and before she knows it, she climaxes just from her nipples, and she becomes addicted to sex with her father...