Nao was happy living a peaceful life with her husband, who was well-ordered. However, she just couldn't get used to their nighttime routine. Then her playboy uncle, Takuo, came to visit her house... She was seduced by his constant provocations and ended up having sex with him "just once." He used his delicate fingers, which were completely different from her husband's, his bold tongue skills, and his piston-like movements that rubbed against her vaginal walls, making her cum countless times. Since then, Nao has tried to turn down Takuo's persistent advances, but...