"Just this once," they whisper, as the twins lock their door, eager to finally give in to their forbidden fantasies. They strip, their eyes roaming over each other's curves and hard cocks. They start with gentle touches, their fingers tracing each other's wet, hungry holes. But soon, their desire takes over, and they're fucking hard, their bodies slapping together, their moans echoing. They cum together, their bodies shaking with pleasure and the thrill of their taboo act, their cum mingling on their stomachs as they collapse, panting and spent.