She's mesmerized as he pins her against the wall. He's telling her every perverted, degrading, twisted thing he's going to do to her. A chill goes down her spine as she realizes exactly how far she wants him to go.
Your little sister may have an ego as big as her cock, but you're always sure to remind her how easily you can pin her down and assfuck her... Of course, it wouldn't be any fun if you didn't let her get you back every now and then.