A big-breasted mom teaches her son, who can't swim, by getting in the water herself! Swimming and sex are both taught by this kind mom♪ The latter half turns into an incestuous swimming competition! They change into high-cut erotic swimsuits, causing wardrobe malfunctions during sumo on a floating island, a splash-off contest with massive ejaculations, and an incestuous medley relay! Dangerous-day internal ejaculation in the water; the son's sperm swims into mom's pussy and gets her pregnant!
