Maria Chihaya moved to Tokyo from Kansai and works as a fitness instructor at a gym, cheerfully teaching yoga and swimming. She's having an affair with her married superior and secretly meets him at love hotels every weekend. Drawn to his muscular physique and his gentle yet sadistic personality, she gradually surrenders both her body and mind to his control. Today, they head to a hot spring for a change of scenery. Under the influence of alcohol, Maria becomes increasingly aggressive, passionately licking his body and attempting to drain his semen with vacuum-like blowjobs and handjob techniques. Eventually, the tables turn—bound by her yukata sash, Maria is teased relentlessly, her entire body subjected to erotic torment as she moans like a submissive female cat, climaxing repeatedly. She reaches orgasm consecutively through fingering and vibrator play, her intensity enhancing the allure of her athletic, school swimsuit-clad figure. Their intimate sex in the bathtub sends sweat and bodily fluids spilling over, their secret tryst continuing until dawn. Maria has a strong preference for muscular men and enjoys acrobatic, flexible sex. These illicit encounters continue to deeply stir her emotions.