The men become friends with the petite sisters who help out with the family business at the hot spring inn where they are staying. They pretend to teach them massage, in the morning bath, and while cleaning the inn... The girls are easily swayed by pleasure, so they get addicted to the middle-aged man's intense caresses! The girls are so into it that they can't resist, so they do as they are told... And on the day of check-out, they realize their dream threesome with the sisters who are sad to say goodbye!