Riko Miyase, a beautiful, tall, model-like married woman. Riko, who is frustrated by her husband's discord, gets fucked by her son-in-law at night one night. Continuing a bad relationship with her son, she ended up showing off her masturbation to each other...and Riko, who had become her son's sex slave, was fucked in a threesome with her son's friend. Riko's beautiful expression is distorted by shame and pleasure, and she continues to be raped by a meat stick thrust into her vaginal opening.