An adult man comes from the countryside for a week of company training in Tokyo and stays with the sister he has not seen in twelve years. Her now-voluptuous breasts and ass make their lover-like closeness unbearable, and she catches his erection in the bathroom. That discovery leads to morning, noon, and night sex—titjobs, blowjobs, his first time, and slippery body play. Her astonishing skill has a reason: she works at a soapland, making her the warmest, softest personal sex worker he could imagine.