Part 4. Lisa Ann is pleasantly surprised when she arrives home from work to find her son's friend Billy in her home, lounging in her son's room while he's out. After she slips into something more comfortable -- the bathtub -- she bothers Billy to hand her a towel. Embarrassed, he covers his eyes to help her out, but she'd rather have him take a nice look at her big tits and wash her back for her. Next thing you know, the hot MILF is sucking Billy's big dick and he fucks his friend's mom in the tub! Rub-a-dub-dub!