A couple visits a hot spring inn for their honeymoon. There, a frustrated, NTR-loving, busty housewife masseuse is waiting, targeting the sperm the husband has been saving to make a baby with his beloved wife. During a massage with his lovey-dovey wife right beside him, the husband is whispered to obscenely in his ear and forced to ejaculate through a slow handjob! This causes the husband's rationality to completely collapse. Seizing the moments when his wife is alone in the open-air or indoor baths, his adulterous sex with the masseuse—who appears disguised as a cleaner or a scrub therapist—accelerates. Outsmarted multiple times by body-washing titjobs and clingy blowjobs, they finally end up alone in a locked room! Begged with "Give me all the sperm you saved for making a baby with your wife!", he throws away his reason and plunges into intense, continuous raw creampie sex!