In a cramped bathroom, a brother and sister find themselves alone and restless. He's about to shower, but she's already in there, secretly pleasuring herself. Caught in the act, she lashes out, but their argument only fans the flames of their hidden desires. Soon, they're both naked, their bodies aching with lust. He strokes his thick cock, and she can't help but imagine it inside her. Just as they're about to give in, a sudden noise outside forces them to abort their taboo encounter.