An 18-year-old sister and brother, both horny and frustrated, find themselves alone together. The sister, a tight-bodied teen, masturbates in the bathroom, her fingers plunging into her wet pussy. Her brother, with a massive cock, walks in on her, and after a heated argument, they decide to explore their mutual desire. The girl, now naked, takes in her brother's thick, straight dick as he jerks off. She fantasizes about it stretching her tight cunt, and just as they're about to fuck, they're interrupted, leaving them both breathless and yearning.