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It's been three years since my ex-girlfriend Mai and my brother got married. My older brother liked Mai, who often came to my house at the time, and after my two-pronged relationship broke up, I married my older brother. However, it seems that their night life is not going well. My brother suspected that Mai might actually have an embarrassing tendency to be unsatisfied with normal sex. Tell me if it's not enough." I reluctantly visited my brother's house and pressed the doorbell.