During her husband's single assignment, Sarina spent her days relieving her frustration with masturbation. One day, Sarina, who was comforting herself as usual, was spotted by her son's friend, Naoya, and she even took a picture of her. From then on, Naoya uses her photo as bait to force Sarina into having sex with her. Sarina, who can't refuse her, reluctantly complies with her request... She had her son see all that part of her...
