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The family bath was a secret place for us. We touched each other's genitals behind our parents' backs. My sister's developed body made me get an erection that I couldn't control. She was so kind that she secretly gave me a handjob in the bathtub. Without our parents knowing, we were sweating in my sister's room, secretly inserting and removing our penises into each other's pussies. Maybe we're just too close.