Rin, who has a bad behavior and is sexually promiscuous, is placed in the care of her relatives and ordered not to go out. She is dying to go out and play, so she first relentlessly seduces her uncle, sneaks into his room at night, and makes him cum in her pussy while masturbating. She sucks the second son's huge cock, and then the beast-like sex of the eldest son with his huge cock causes her to cum repeatedly, and she becomes addicted to the pleasure she has never experienced before...