This is how mom settles me and my brother's arguments. At one end, there's her fat ass that bounces when you're balls deep in her tight pussy. On the other end, her lips wrap around and the warmth of her mouth engulfs your cock. It's kind of hard to argue
Your bully told them not to waste a drop of cum so when he finished cumming on your sister's tits your Mom made sure to clean it off using her mouth to do it