The sister, driven by an insatiable curiosity and lust, explores her brother's body, tracing the lines of his muscles, feeling the heat of his skin. She whispers filthy words into his ear, describing in explicit detail what she wants to do to him, what she wants him to do to her. She grinds against him, her wet pussy leaving a trail on his thigh. She reaches down, stroking his cock, feeling it pulse in her hand. She guides it into her, gasping at the sensation of being filled by her own brother. They move together, their bodies slick with sweat, their moans of pleasure echoing in the room. It's raw, it's taboo, it's everything they've been denying themselves.