Yukiko, who has been married for half a year to a man with a stepson attending a local university. One day, his stepson Kazuya returns home on his day off… Yukiko notices Kazuya's rampant sex drive as he masturbates multiple times a day. Every time she enters his room filled with the scent of male pheromones, she feels a throbbing sensation. One time, while he is asleep, Yukiko can't help but stare at his morning erection. Unable to resist, she takes him in her hand and brings him to climax. However, the insatiable Kazuya doesn't stop there and repeatedly begs her for more releases…
