Ha, ha - took a guy off on the beach promising to show her stretching at home. Such a tight ass no one would miss! And she, too, when she saw the size of his corkscrew, was already thinking of nothing but that - so excited for him to uncork it! I am sure she has already measured it with her eye. Now she will brag to her girlfriends that she fucked a 23 cm stallion!
She's really got it in for her brother. There's no point in arguing with her, telling her off. So at least he played out all his anger during sex by pounding her between her big buns.