The air is thick with tension and the scent of forbidden lust. A brother and sister, both in their late teens, find themselves alone in the house, their parents out of town. They're supposed to be studying, but the textbooks are closed, their minds elsewhere. She's wearing a short skirt, he's in just a t-shirt, their bodies barely contained. They start to argue, their voices raising, but it's clear there's more to their heated exchange than sibling rivalry. They're circling each other, their bodies primed, their inhibitions low. It's only a matter of time before they give in, before they cross that line, before they indulge in the sinful pleasure they've both been craving.