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Forbidden physical relationship between brother and sister with blood. It all started when my brother and sister, who were close friends, were taking a bath together and played with my sister's genitals out of mischief. For the first time, a one-night, two-day hot spring trip with just two people, giving a reason to their parents in secret. It is embarrassing but vaginal cum shot to a naive younger sister who responds to the request of an impure older brother.