Eriko Hiraoka's daughter has a boyfriend, and they've built a good relationship with the whole family. However, her boyfriend seems to have a strong sex drive, engaging in sexual acts repeatedly in his daughter's room. The sounds even reached Eriko and her husband's bedroom, who remarked that he was impressive. One day, when Eriko returned home from shopping, she found her daughter absent and her boyfriend masturbating alone. Although flustered, Eriko tried to comfort him when he confided in her about his overwhelming sex drive, saying, "It's not strange for young men to have a strong sex drive." However, her boyfriend's libido wouldn't be tamed. As Eriko desperately resisted, her legs trembled uncontrollably, reaching a point where the pleasure was so intense she couldn't stand.
