After her mother remarried, she thought that the family would gather together and smile more, and that happy days would continue forever. Until that day... One day, after a string of tropical nights, Yui's huge stepfather sneaks into her futon and suddenly licks her whole body, leaving her unable to move, and rapes her with a creampie in a seed press. To satisfy her stepfather's sexual desires, she makes him suck his dick in the morning, and at night he rapes her with a creampie, and the domestic rape continues for years... What is the outlet for Yui's sexual desires, having had sperm poured deep into her uterus and grown to be 20 years old?