SOD Sex Science Lab, which seriously studies sex.This time's theme is "intestinal juice".A thorough report of cleaning, dilation, enema, and anal sex performed by a female researcher who used herself as a subject.Even though her face turned pale, she bravely participated in enema, AtoM, and three-hole fuck experiments, making full use of the entire area of SOD's headquarters to record a research record of a total of 15,000 ml of intestinal juice.
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