In the dimly lit gym studio, the wife's tight, toned body glistens with sweat as she eagerly mounts her instructor, his thick cock filling her completely. Their bodies slap together, flesh against flesh, as she rides him enthusiastically, her tits bouncing, and her fingers clawing at his muscular chest. The instructor's grunts grow louder, his grip on her hips tightening as he nears climax, unleashing a torrent of hot cum deep inside her.