A devilish father who has sexually trained his own daughter Lala (142cm, hairless) with distorted love now takes care of his niece Yuka (136cm, hairless) during her summer vacation. Yuka is frightened by the abnormal incest between her kind uncle and Yuka's sisterly father.... Yuka's underdeveloped body, which refuses to be fucked, is trained to give herself a blowjob, cum-drink, beg for cum inside, and perform a cleaning blowjob. And then... it becomes commonplace for the two cousins to serve their "uncle" together.