Huddled together in the quiet of their shared home, the siblings 'Just Us' in their secret world, let their inhibitions slip away. The brother, his hands trembling slightly, gently cups his sister's breasts, feeling their weight and softness through her thin nightgown. She moans softly, her head falling back, as he begins to explore her body, his fingers tracing the curves and lines he's known all his life, but never like this. Their 'playing' becomes more intense, their breaths coming in ragged gasps as they push each other closer to the edge of their taboo desires.