In an isolated house, a brother and sister, both teens, find themselves alone and restless. She's a curious, horny girl, he's a curious, horny boy. They start masturbating separately, she in the bathroom, he in his room. She's loud, he's curious, and soon he's watching her through the bathroom door. They argue, she's pissed, he's hard. Later, they make up, and she asks him to show her his cock. He does, and she's impressed. They're about to fuck when someone's footsteps interrupt, leaving them breathless and horny.