"It feels good when I slap you, doesn't it?" The story begins with these lewd words from the older sister, initiating a cruel tease. The man doesn't realize just how masochistic he truly is, but his sister instantly sees through his nature. As he experiences erotic scenes like intense face sitting and orgasm-denial sex, he gradually starts to awaken to his true self. The relationship unfolds between the sister who enjoys dominating him and the man who slowly reveals his submissive side.