Watch Tiffany do it

Tiffany signals to one of the blue sneakered men who gestures to the house behind him. You follow him inside. In the hallway, your sister drops to her knees. Instinctively you hold her hair back as she sucks. She teaches you several techniques - swirling the tongue, kissing up and down the side, sucking the balls. You take turns as she teaches you. After a while the man begins face fucking her. As he cums you recognise him as one of the guys who kicked your ass and robbed you only a week ago.