Because the company cut staff, I am currently unemployed. Thanks to unemployment insurance, I can hold out for a while longer. Suddenly a beautiful girl moved into the room opposite. From my room I can see the whole side through the window. It seemed like she didn't even know she was being peeped on, carelessly making love to someone else right at the window so I could admire her entire perfect body. After a while of monitoring, I discovered that it seemed that the man was not the beautiful girl's husband. He always came at 3:00 p.m., and the days he came were gradually decreasing. Today is the day he still comes to fuck her. But after waiting for a long time no one appeared, suddenly she discovered me and called me over. Her name is Suzume Mino, and she knows I'm watching her. Thinking that Mino-san would be angry, I knelt down and asked for forgiveness. But contrary to my thoughts, she wasn't angry at all and wanted me... to practice horse riding with her! The story is that Mino-san is the other man's lover, he always criticizes her poor sexual skills, especially when it comes to horseback riding. Mino-san thinks that because of that, he gradually got bored of her and came here less often. She wants to improve sexual performance and help men feel even more pleasure. And from then on I became a tool for her to practice. I was only allowed to lie still while she straddled me. But over time, she seemed to be accepting me more, no longer doing everything herself but letting me take the initiative, enjoying sexual pleasure together...