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My younger brother, who is a lot older than me, is good at sports and is good-looking. Maybe it's because I recently got a cute girlfriend, Rin, that I often bring her home. As a younger brother, I don't think he's trying to show off. However, as an unpopular person like me, I can't help but feel proud of it. One day I witnessed my younger brother and Rin having sex...I couldn't help but record the scene and everything started...