Aoi Hazuki, the younger sister, is discovered to have accumulated debt and secretly visited big-tit brothels, leaving her brother overwhelmed with rage and disappointment. Filled with intense emotions toward him, she declares, "I'll keep titty-fucking you until you hate my breasts—just you wait!" Shaken by her words, the brother finds himself trapped at home, subjected daily to her forceful restraints, verbal abuse, and piercing glares, repeatedly creampie-loaded through aggressive titty-fucks. The story unfolds as a painful yet arousing depiction of their twisted, inescapable routine where suffering and pleasure collide.