Nanako was a good wife, juggling her work and family life. However, she had been unaware of her own sexual desires. One day, she was working overtime alone with the new employee Uchimura. Nanako felt affection for him, who was so innocent, and Kokoro invited him. Then, Uchimura thrusted into her passionately, making her cum again and again. Nanako was flushed by the lingering sensation of penetration even after the act, and spent another night alone with him.