A niece developing into a woman due to secondary sexual characteristics. The unique allure of a girl transitioning from adolescence to adulthood causes her uncle's reason to crumble, leading to incest. In a situation where relatives could return at any moment, they indulge in their affair nonstop. The niece, newly awakened to sexuality, reaches her first orgasm on her uncle's dick. Her writhing form, experiencing pleasure for the first time, is undeniably obscene！！
