While his wife is away traveling alone, he secretly meets her adult sister Yuka. With his marriage already cold, he cannot resist her sweet, devilish temptation or her claim that his wife is probably cheating too. Her healing smile, narrow waist, and unexpectedly plump ass make him forget his wife completely. Though he knows it is wrong, they fuck through the afternoon, evening, night, and next morning, with repeated creampies. When Yuka says she does not want to leave, he wishes he had met her first.