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Mayu, a younger sister, and Kenji, an older brother, who attend the same school. The two had a physical relationship without telling anyone. However, the younger sister was a so-called'Tsundere'who behaved strangely to her brother outside. One day, Kenji can rumor that Mayu has a boyfriend in the same class. Kenji couldn't control it because of jealousy, so he took Mayu and had unequaled vaginal cum shot sex everywhere in the school.