A brother and sister, driven by hormonal urges, find themselves alone and horny. The sister, feeling neglected, starts pleasuring herself, only to be caught by her brother. They argue, but the tension quickly turns into desire. They decide to masturbate in front of each other, the sister's wetness increasing as she watches her brother's throbbing cock. Just as they're about to cross the line, an interruption forces them to stop, leaving them both unsatisfied and yearning for more.