STAR-677 China Matsuoka The overdeveloped big-breasted little sister is my obedient masochistic pet for processing

The perverted older brother rapes his overly developed H-cup busty younger sister 'China'. The brother, who has sexual feelings for his sister, one day mistakes a classmate delivering notes as her boyfriend and out of jealousy rapes his sister... And from that day on, she is raped daily as a sex toy. Eventually, the sister, trained to be a masochist, becomes obedient to her brother's commands and begs for his erect penis, falling into a state of promiscuity...