One night and two days of 1 night and left alone by my wife's sister who suddenly came over

Satsuki hasn't been going well with her husband lately, and has been struggling with frustration. At that moment, he learns that his younger sister has returned to her parents' house to give birth. When Satsuki thinks about his younger sister's husband, Kentaro, who is left alone, he is unable to stand up, so he goes to his younger sister's house as if to come. There, Satsuki provokes her by showing off her white chest and sexy panties, and finally, she enters naked while he is bathing. Kentaro is so bold at the temptation of his sexy sister-in-law Satsuki...