Bored and horny, a blonde sister and brother retreat to their rooms, unaware they're about to be caught. The sister, finger-fucking herself, doesn't hear her brother enter. He freezes, watching her rub her pussy and ass, before she notices him. They argue, but curiosity and arousal win out. He strokes his hard cock, she licks her lips, and soon they're engaged in a passionate, taboo-forbidden fuck fest. He pops her cherry, she sucks him off, and they cum together in a forbidden, familial bliss.