In the quiet of their shared home, two teenagers, one brother and one sister, find themselves alone and restless. The brother, curious and horny, spots his sister masturbating in her room. She's a vision, her young body ripe and her fingers working her wet pussy. He can't help but watch, his own hand drifting to his hardening cock. Soon, she notices him, and instead of being upset, she invites him to join her. Together, they explore their bodies and desires, learning the art of masturbation side by side.