A brother and sister, alone in the house, find themselves drawn to each other's dark desires. She watches him play with a vibrator, his ass clenching around it as he moans in pleasure. He notices her fascination and offers her the toy, their eyes locked as she tentatively accepts. They take turns, their assholes stretching and pulsing around the toy, their bodies writhing with pleasure. They're both close, their bodies tensing, when suddenly, their parents' voices echo through the house, forcing them to stop abruptly and hide their taboo toys.