A family arrives at a hot spring inn in the countryside for a vacation. Intending to relax, they find themselves caught in an unexpected turn of events. Captured on camera is a secret affair between mother and son, stealing moments behind the father's back. Shortly after arriving at the inn, the two indulge in passionate sex. This is the continuation of what wasn't shown in the first part. Alone together in the large public bath, the son keeps filming his mother's seductive figure. Though shy, her pleasure is clearly evident. The tired father collapses onto the futon and falls fast asleep. Meanwhile, the son once again grows aroused by his mother, beginning bold advances right beside the sleeping man. The mother protests, "No, we shouldn't," yet her true feelings reveal enjoyment. Moaning passionately, she straddles her son and grinds her hips fiercely. Even within the bonds of family, hidden desires stir.