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Her seminar friends call her "Natsu-nee" - Hinata-senpai is a caring older sister type, but no one knows her strong-willed side. She is a masochistic woman who is obedient and submissive to the man she loves, but when we are alone, her position changes 180 degrees and she goes from woman to female in front of me. Seminar trips are boring... As soon as we arrive at the inn, I immediately do a deep throat and get a good bang. I don't feel like going to field work, so I pretend to be sick so that I can be alone with Hinata-senpai and have plenty of training sex with her until the friends come back. I call her to the men's bath and make her wear an embarrassing, see-through uniform and have sex with her fully clothed. I have a thrilling, immoral sex with her while both the teacher and the friends are drunk and make her hold back her voice. No matter how unreasonable my requests, she never refuses. My personal masochistic pet.