My younger sister is a submissive sex slave. (JUMP-4025)

In school, Ikebata Makoto was a well-behaved student. She had an older brother. One day, she was caught masturbating in her brother's room. He couldn't resist and forced himself on her. From that day on, her lustful body began to awaken. Every morning and evening, she was fucked until she drooled, indulging in pleasure and humiliation...