Curvy, popular Miyu Morita is frustrated by her sexless marriage and takes 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, where he sucks her huge tits and fingers her pussy until she is overwhelmed with pleasure. Miyu returns the favor with a blowjob and titjob before they get carried away and he creampies her, finally relieving all her pent-up frustration.