Bored siblings Alex and Jamie, both in their late teens, find themselves alone at home one afternoon. Jamie, the elder, begins to masturbate in his room, his thoughts drifting to his younger sister's curves. Meanwhile, Alex, in the bathroom, discovers her own desires, fingering herself to climax. Caught in the act by Jamie, they argue, but their heated exchange only fans the flames of their burgeoning lust. Naked and vulnerable, they confess their fantasies, Alex admitting she dreams of Jamie's cock filling her tight pussy. Just as they're about to act on their taboo desires, their mom returns, forcing them to abort their erotic encounter.