"Sister Xia," known as "senpai," is a caring and considerate senior colleague. No one knows her introverted side. She's a submissive, obedient masochist, but her attitude completely changes when you're alone with her. She becomes a woman. During our trip, she immediately performed deep throat oral sex upon entering the hotel, ejaculating once and then stopping. There were no other activities; I simply pretended to be sick, arranged for a private time with Sister Xia, and continued the BDSM sex until Nakama returned. In the men's bathroom, she wore a transparent uniform and engaged in sex with her fully clothed. The teacher and Nakama were both drunk, and I made her endure the noise while we engaged in stimulating and immoral sex. Regardless, she would never refuse me. My personal masochistic pet.