To show his appreciation to his mother who raised him alone after losing his father, he invited her to a hot spring inn. The mother bathed in the hot spring and was pleased with the meal that was prepared for her. The son began to massage his mother to make her feel even more uncomfortable. After a short silence, the mother told her son that she was currently dating a man. The son was so shocked by his mother's confession that his head almost split open. Late at night, the mother was fast asleep, but the son could not fall asleep. Memories of his mother came to his mind. Rather than losing his mother, he lifted the futon and began to play with her body. When the mother woke up, she was surprised by her son's strange behavior, but she could not resist the man's strength, so she accepted her son and reached orgasm herself...