A wave of guilt washes over Mateus as he watches his girlfriend, a 'puta' in his words, shamelessly riding his cock. Yet, his body responds, his cock hardening as she grinds against him. He grabs her hips, slamming her down onto his dick, his balls slapping against her ass. Their bodies slick with sweat, they move together, a dance of lust and regret, until they both tumble over the edge into explosive orgasm.