The older sister harbored deep and intense jealousy toward her younger sister, who was always favored and adored by their parents. This jealousy eventually spiraled into madness, leading the sister to forcefully dominate the younger one whenever their parents were away. She repeatedly subjected her to extreme perverted abuse, growing increasingly aroused by the suffering she inflicted. The older sister demanded, "Drink every drop," forcing the younger sister to consume her urine, becoming more and more addicted to the pleasure this act provided. Through various forms of torment—including forced face sitting, cunnilingus, and dildo penetration—their sisterly bond twisted into a deeper, perverted lesbian incest relationship. This work contains no performers under the age of 18.