Matsudaira Reiko, 46 years old. She is a female president who runs a small consulting firm in the countryside, and a beautiful mature wife. She is aware that she was "born with the qualities to become a slave," and due to her position, she can stay overnight under the guise of business trips, so each time she undergoes training sessions lasting at least one night. If her husband found out, divorce would be certain, but she says, "If that happens, I want to be kept as a sex slave for the rest of my life," with a dreamy expression, a true masochist. She called over a friend who likes mature women, and the two of them used her thoroughly. After having her anus toyed with, her pussy used, and her ass beaten extensively, the next day after training, she sent a message asking, "When can I request the next session?"—a greedy mature masochist.