In a dimly lit bedroom, a sister, driven by curiosity and lust, sneaks into her brother's room. She finds him asleep, his cock tenting the sheets. Unable to resist, she gently pulls it out, revealing its impressive length. She tentatively strokes it, feeling it grow harder in her hand. Her brother stirs, waking up to find his sister's hand on his cock. Instead of pushing her away, he looks at her with a mix of surprise and desire. She leans down, taking his cock into her mouth, sucking it softly. He groans, his hips moving in rhythm with her head.