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In a private, dimly lit dungeon, a submissive man is secured to a bondage chair, his legs spread wide. A fucking machine stands ready, its steel shaft glinting under the soft light. His mistress, unseen but her voice echoing, orders him to relax. The machine comes to life, its shaft pressing against his asshole, slowly pushing in. The sub gasps, his body tensing, then relaxing as he accepts the machine's rhythmic fucking. His cock hardens, tenting the fabric of his underwear, as he's used, his pleasure building with each thrust.