STAR-677 Matsuoka China: The Well-Developed Busty Sister is My Ideal Pet for Incestuous Sexual Training, 190 Minutes of Breast Worship

A perverted brother sexually abuses his well-developed, busty younger sister 'China' who he harbors incestuous feelings for. One day, when a classmate comes over to return a notebook, the brother takes the opportunity to isolate and sexually assault his sister. From that day on, he continues to treat her as his personal sex toy, subjecting her to daily sexual abuse. Gradually trained into a submissive and obedient masochist, the sister becomes a depraved girl who eagerly offers her body and arousal to her brother's desires.