Mark and Ann look up and discover that their younger sister, Lisa has entered the house. Lisa is about 5' 6" with blond hair. She is dressed in a short blue mini skirt, black stockings and a tight white blouse. You can see the outline of her blue bra through her blouse. Her nipples look hard pushing against her blouse. Lisa looks excited one hand is caressing her size c breasts and her other hand is between her legs. You can see a wet spot on her light blue panties.
Mark asks "We are making love would you like to join us?"
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