Tatsuro, who happened to live with his aunt Hisayo, was troubled by her being too free with sex. Show off her chest and crotch without even trying to hide her underwear, let her gasp every night and indulge in her masturbation. In such days, Tatsuro could not hide his confusion and spent his time in agony. Then one night, Hisayo suddenly came in while Tatsuro was taking a bath. Despite Tatsuro's surprise, the naked Hisayo leads her to her climax while playing with Tatsuro's cock, which has been erected to bursting.
