Eriko Hiraoka has been married to a man with a stepson for three months. While her relationship with her husband is good, she hasn't yet bonded with his son, Kazuya. Seeing this, her husband proposes a family vacation... Eventually, Kazuya begins to feel Eriko's feminine charm and, unable to control his rising lust, pushes her down. With wild thrusts and relentless caresses, Eriko reaches orgasm again and again. Her body aches with desire from the perfect sex with Kazuya that she has never experienced before.