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A brother and sister find themselves alone at home, believing their parents are away on vacation and that the brother's school trip is scheduled for the following week. The sister, thinking she has the house to herself, returns home with the intention of indulging in private activities without restraint.
However, her plans are disrupted when she discovers that her brother's trip is actually next week, not this one. The unexpected encounter between the siblings leads to a series of intimate and awkward situations.