Reiko, 46 years old. Lately, she feels her son's heated gaze... As her period is about to start, she inserts a tampon and is caught by her son. 'Women have periods,' she begins sex education. Eventually, Reiko becomes interested in her son's crotch, makes him expose his penis, and lectures on male physiology... This marks the beginning, as she also educates her son's friends who come to play. The insatiable mom who devours young penises!
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