The mother-in-law was too slutty
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The presence of a hidden camera in that room speaks volumes beyond what is obvious. First, we need to see who placed it there, as whoever did it likely wants to know something that is being kept from them. That would be the old woman’s husband, who has no idea that the woman is having sex with her own son and committing incest. The old woman seems to have lost all sense of morality, and on top of being unfaithful, her young one is too. Just like his mother, he seems to have learned nothing from all that his father taught him and has had sex with his own mother’s vagina.