Tsukumi, the sister who is grabbed by her brother's firm penis. While mentally rejecting the daily harassment from her brother, she fears being disliked by him and thus offers her small body. When ordered to pour her saliva into her brother's mouth, she squirms her lips and pours in her sticky saliva, and when told to take in his erect penis, she diligently serves with her small mouth and catches his semen. At night, her father's usual fellatio dirties her mouth, and she is forced to spread her bare pussy, receiving intense cunnilingus that makes her leak love juice. When her father lowers his hips to twist his large penis into her small, narrow petals, she ascends to heaven with an expression of pain or pleasure. Her father fills her vagina with thick semen, and today she becomes the family's flesh doll. And tomorrow, she will be defiled again by the semen of her father and brother...