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Meanwhile, a plan had slowly been forming in Ariel Castro’s head. He had decided to kidnap a young girl and imprison her as his sex slave, to satisfy his lustful cravings. Since Nilda and his children had left, he had become obsessed with sadomasochistic sex and humiliation. His sexual fantasies had become darker and darker and his basement was now full of hard-core S-and-M sex videos.
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John Glatt (The Lost Girls: The True Story of the Cleveland Abductions and the Incredible Rescue of Michelle Knight, Amanda Berry, and Gina DeJesus)