A sister who loves her brother even after getting married is jealous of his wife and seduces him. A younger sister who came into the men's bath at a hot spring inn and asked, "Let me squid 10 times." Innocent gestures and erotic behavior, such as a younger sister who asks for her brother while her wife is sleeping at an inn, gradually turn her brother's refusal into excitement, reaching out to his body and having rich incest sex. I will do