Shiori, a married woman worried about maintaining her gorgeous ass, hires a discreet personal trainer popular with celebrities. He promises that her husband will notice her again and persuades her to take the lower-body workout seriously, insisting there will be no penetration if she follows the routine correctly. Squats make her ass muscles tremble as the training grows increasingly suggestive and extreme. Soon control slips away, his cock repeatedly sinks inside, and she cannot escape the pleasure of riding his piston strokes until he creampies her.