Homemade video of a naughty sister masturbating to her stepbrother's big dick

The video features a naughty sister who is secretly filming herself as she masturbates to the thought of her stepbrother's big dick. She starts off by teasing the camera, showing off her perky tits and tight ass, before slowly stripping down to her underwear. As she gets more and more turned on, she starts to touch herself, running her hands over her clit and moaning softly. The camera zooms in on her face as she gets closer and closer to orgasm, her eyes rolling back in her head. Suddenly, she hears a knock on the door and panics, thinking it might be her stepbrother. But when she opens the door, she finds it's just a friend, and she quickly hides the camera in the closet. The friend doesn't notice anything amiss, and the sister is able to finish herself off without interruption.