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■This work is a record of the training of Marika (not her real name), a beautiful 28-year-old wife. Despite being a married woman, she has secretly become a slave to her apartment neighbor. ■When she was a teenager, her boyfriend at the time performed anal cunnilingus on her, awakening her to the pleasures of anal sex. Since then, she has struggled to find a man who can give her that pleasure, until, by chance, she meets her apartment neighbor...