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Yuu, a strong and a little selfish sister, and Chiharu, a younger sister who is quiet and weak to push. - The two were having tea in the living room and complaining about each other's boyfriends. - Yuu was a little jealous when she heard that her boyfriend's sex was too intense because she was in trouble, and she became interested in her boyfriend. - So Yuu asked Chiharu, "Would you like to replace your boyfriend?"