Mother in Law Slave Shackles Rika is unable to become accustomed to her life with her husband and his child from a previous marriage. Since Rika came to their house, the son has been staying indoors all the time. Her husband doesn't care, and so she commits adultery with an insurance man. One day, she discovers a video of her and her lost underwear in her step-son's room. She is then blackmailed with a video of her adultery and raped by her step-son. She is raped, broken in and tortured by her step-son, and becomes ever more like a slave.. Mother-in-law Slave Special Edition Sho Nishino.