A married couple is on a hot spring getaway. At first glance, they seem happy, but in reality, the husband is addicted to gambling and has run up a large amount of debt to a loan shark without his wife's knowledge. The loan shark barges into the couple's room and threatens, saying, "If you can't pay the money, pay with your wife's body," so the husband reluctantly offers up his wife. The slender beauty is penetrated by a huge penis in front of her husband, but feeling her husband's gaze, she climaxes over and over again in her first threesome, gradually becoming addicted to the pleasure of immorality. Then, cloudy white semen is poured into her uterus...