The size doesn’t matter because she takes it up her ass
In her room, she can do whatever she wants. It’s the rule that her father made, um, she hoped that no one could go in there and when she thought about that, she believed that whatever she would do, she would do it herself. And he couldn’t have been more wrong, since his cousin has access and he more than anyone knows that the size of the cock doesn’t matter, because she can easily take it up her ass. She likes anal fucking like any Latina and of course this guy has to please her. It’s normal, they are family and the love they feel for each other leads them to do what they do.