To ease her son's nerves before an upcoming exam, mother Chisato took him on a hot spring trip. They arrived at a somewhat rundown but atmospheric inn. Chisato told her son to study before taking a bath, and he nodded in agreement. After some time, her son asked Chisato for the usual thing. With a resigned expression, she said, 'I'll do it for you if you solve these problems,' and pulled down his pants. His already erect penis was sucked slowly. Once her son finished solving the problems, he couldn't hold back any longer and started to play with Chisato. Me too, Chisato clung to her son and gave him a deep kiss. The two intensely sought each other out until they reached their climax. Satisfied, the pair headed to the open-air bath. While washing each other, they naturally began to caress and desire one another again. A man recording this scene. He was an employee of the inn. He had noticed that Chisato and her son's behavior wasn't like that of a normal parent and child, so he had been keeping an eye on them. The next day, the employee appeared before Chisato, showing her the video from the previous day with a smirk.
