Your Girlfriend's Trainer

The air in the studio is heavy with sweat and tension. Your girlfriend moans softly as the trainer, Mark, pushes her hands above her head and guides her hips with his strong arms. "That's better, babe," he whispers to her, while his tank top clings to his muscular upper body. You sit on the bench, hands clenched, watching as his fingers glide over her stomach – supposedly to correct her posture. But his gaze tells you he wants more. And her? She bites her lip as he pulls her closer to him. "Don't you want to show me how to do it properly?" he suddenly asks you, a mocking grin on his face.