She wasn't angry at all, she even wanted me to... practice riding with her! The thing is, Shiina Sayuri was the lover of that man, he always criticized her poor sexual skills, especially riding. Shiina Sayuri thought that's why he gradually got bored with her and came here less often. She wanted to improve her sexual ability and help men feel more pleasure. And from then on, I became a tool for her to practice. I was only allowed to lie still while she rode on me. But over time, she seemed to accept me more, no longer doing everything herself but letting me take the initiative, enjoying sexual pleasure together...