Unbeknownst to their parents, two straight siblings, bored and horny, find themselves alone in the house. The sister, a curious amateur, starts touching herself, moaning softly. Her brother, unable to resist, enters the room, catching her in the act. They argue, but the tension is palpable. Soon, they're both naked, the sister stroking her brother's thick cock, the brother fingering her tight pussy. They fuck hard and raw, their amateur moans filling the room until they're interrupted by an unknown sound, forcing them to quickly clean up and hide their secret encounter.