Mai, a sultry young thing, finds herself alone with her brother, Nokro, in their cramped apartment. Boredom turns to curiosity, and Mai starts to touch herself, her moans barely contained. Nokro, hearing her, enters the room, catching Mai in the act. They argue, but the tension is palpable, and soon, they're both naked, Mai admiring Nokro's thick, hard cock. They start to masturbate openly, but just as they're about to cross the line, a noise forces them to stop, leaving them breathless and yearning.