The door clicks shut behind them, sealing off the world and their inhibitions. Tia's hands roam over her nephew's body, tracing the lines of his muscles, feeling the heat of his skin. He responds in kind, his fingers finding her hard nipples, pinching them through her blouse. She leans back against the wall, her breath coming in short gasps as he hikes up her skirt, pushing aside her panties to reveal her slick, ready pussy. His cock, hard and ready, slides into her with a single, smooth motion. She bites her lip to stifle a moan, her nails digging into his back as he begins to move, fucking her hard and fast, their bodies slapping together in a rhythm as old as time.