In the confines of their shared apartment, a lonely brother can't help but watch his sister masturbate through the crack in her door. Her moans of pleasure echo as she fingers her wet slit, making his cock twitch. Driven mad with desire, he storms in, catching her mid-orgasm. She's furious, but the sight of his throbbing erection gives her an idea. She demands he fuck her hard, and he's more than eager to comply.