STAR-540 Sister Mao Sena Trained by Brother, Becomes Sex Slave

Mao Sena's brother sees her with a senior at her part-time job and rapes her out of jealousy, starting a tragedy born from a misunderstanding and his abnormal sexual desire. From that day, he trains her almost every night, and her masochistic nature blossoms as she endures his perverted habits, becoming a sex slave craving his dick. She says, "I... am violated by my brother every day..."