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Fair-skinned, slender beauty Satomi Usui is a lecturer who will teach you how to improve your sexless marriage! The trainees get excited after watching her masturbate in front of them, and think that it's pointless for only the teacher to practice, so they ask if they can join in. Ms. Satomi readily agrees, has the trainees hold a vibrator, and has them get on all fours and insert the vibrator deep into their pussies from behind, making them cum over and over again! Then, as she shows them step by step how to take it to sex, the frustrated Ms. Satomi starts craving cock and has a threesome creampie sex with the two trainees! Please enjoy Ms. Satomi's sexless marriage lesson as she loses herself in orgasm after orgasm!