Suddenly, my brother's ex-girlfriend, Tsukasa-san, showed up. My brother was a terrible womanizer, and he trained me sexually, played with me, and even got me in debt before dumping me, so I had to take over. There was no way I could pay him back, so I was taken to a hotel, stripped naked, and trained him sexually, just like my brother did to Tsukasa-san. I refused because I had a girlfriend, but the nasty, perverted play that I had never experienced before gradually seeped into my body, and now I can only get an erection with Tsukasa-san...