My niece, whom I haven't seen in a while, sits on my lap! No matter how much I beg her, she won't get off... Her innocently bouncing ass stimulates me and I get a full erection! Just as I'm starting to worry about being found out, my niece does something unexpected! Even though the family is right nearby, she starts to rub her penis against mine/inserts it raw without my permission! She even starts to shake her hips/cums inside me! A thrilling incestuous sex scene unfolds under my skirt!!