MADN-003: Incest with Grandson — A Lustful Sixty-Year-Old Woman Who, While Bathing, Becomes Captivated by Her Grandson's Huge Penis, Revives Her Withered Libido and Repeatedly Mates with Him — 大槻美登利

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Because his parents both worked, when he was a child he did everything with his grandmother. After his mother became a full-time housewife he was separated from 美登利, but they started living together again. However, as a university student he felt it was uncool to be spoiled by his grandmother and was troubled. Then one day his father, 恭平, invited the three of them to go on a hot spring trip.