Recently Satsuki was not doing well with her husband and was suffering from frustration.At that time, she finds out that her sister is returning to her parents' house to give birth.Satsuki can't help but think of her sister's husband, Kentaro, who was left alone, and she rushes to her sister's house.So Satsuki provokes her by showing off her white breasts and sexy panties, and as a result, she comes in naked while he is taking a bath.Kentaro is tempted by the daring temptation of Satsuki, his sister-in-law who is full of sex appeal.