Three years after her mother passed away, Miki Yamase, a young woman, remarried her father last year. However, her son couldn't see Miki as his mother and viewed her as a sexual object. While Miki was showering, her son snuck into the dressing room and sniffed her underwear. He masturbated, fantasizing about being given a blowjob by his mother. One day, Miki started masturbating in the kitchen. Her son peeked at her from hiding, but she noticed him and showed him what she was doing. "Are you there? Have you been watching me all along?" she asked, and accepted her son's presence...