While his wife was returning home to prepare for the birth of her child, his sister-in-law Chihiro suddenly came to visit him. He takes care of his brother-in-law, who must be in trouble due to his wife's absence, by doing the cooking, laundry, and cooking. However, Chihiro's relationship with her husband is not going well, and she is frustrated and on the verge of exploding. She has her sights set on his brother-in-law's dick. While his brother-in-law is taking a bath, Chihiro barges in and seduces him by showing off her voluptuous body, and the man's reason wavers. What will become of the dick that has been targeted?