Forbidden Family Friction

A brother and sister, alone in the house, find their thoughts turning to each other. She strokes her wet slit, he jerks his thick cock, each believing the other unaware. But when he bursts in on her, catching her mid-act, their shared secret is out. They argue, but the tension is undeniable. Later, they give in, masturbating openly in front of each other, their desire palpable. Just as they're about to cross the final line, a noise from outside forces them apart.

• Unknown