During the week of her estranged sister's spring break, Aunt Monami is left to look after her estranged sister's child. One day, while her nephew is taking a nap, she happens to notice his fully erect huge cock and can't help but touch it... With her weakness exposed, the aunt is trained without her husband or son's knowledge and gradually becomes a sow. "Please give me your semen in my womb..." In the end, at her nephew's urging, she finally takes her hands on her son's cock, shaking her huge tits as she swings her hips like crazy in breeding sex!