Fifty-year-old married woman Mika Mikoshiba hires a personal trainer to reshape her voluptuous body at home. His hands keep wandering during the workout, leaving her so aroused that she wants him to grab her breasts, ass, and pussy more boldly. Reading the mood, he fondles every part she offers and makes her climax repeatedly. During her second session, she sexually pursues a different trainer and has affair sex with him in her living room. By the third workout, she asks for sex from the start and enjoys a long, sticky session with the muscular trainer.