STAR-677 China Matsuoka - My overdeveloped big-breasted sister is my obedient masochistic sex pet

China, a sister with overdeveloped H-cup breasts, is violated by her perverted brother. One day, when a classmate comes to deliver a notebook to her, the brother, who has sexual feelings for his sister, mistakes him for her boyfriend and, in a fit of jealousy, rapes her... From that day on, she continues to be violated as a sex toy every day. Eventually, trained to be a masochist, the sister becomes submissive to her brother and becomes a slut who begs for his erect cock...