Popular, curvy Miyu Morita is frustrated by a sexless marriage and signs up for swimming lessons to relieve the stress. Flirting with the lecherous instructor makes her lose control: she lets him touch her all over, then sucks his cock until he cums. They move to a bed for the main event, where he sucks her large breasts and fingers her pussy until she feels incredible. She returns the favor with a blowjob and titjob before they get carried away and he creampies her, finally leaving her thoroughly relieved.