Wanting to slim down before marriage, a woman joins a gym and is assigned a muscular male trainer. After he flaunts the rugged physique and masculinity her boyfriend lacks, she begins an affair with him. She visits the gym every day just to see him, her abs becoming more sharply defined with every session. Drawn deeper toward this powerful man, she is conquered by rough, muscle-driven fucking and repeatedly brought to orgasm while her boyfriend can only watch his loyal girlfriend slip away in this bleak NTR story.