Strange traditions: a stranger fucks a wife in front of her husband and daughter

A sweet young girl went for a walk to the lake and found a half-dead guy there, who had wandered out of the woods. She brought him home and, together with her mom, gave him first aid. According to the traditions of the community where the girl and her family lived, she was obliged to marry the stranger. But first, another ancient tradition of the community had to be observed: her mother had to have sex with him, and in front of her daughter and husband.