She tests my limits, her pussy clenched around me, tits pressed against my chest. "Cum for me," she demands, her voice husky. I grit my teeth, trying to hold back, but her pussy squeezes me, her nails dig into my back. I can't take it anymore. I cum, hard, filling her, marking her as mine. She smiles, satisfied, as she milks every last drop from my spent cock.