Yu and Yuria have to live with their new father because of their mother's remarriage. The two of them were secretly working on customs, but one day, their father-in-law called them on a 3P course without knowing it. Two people who despise the manners and customs even though they have a mother. Meanwhile, Yu is fired from her sex industry because of the recession. Yu, who doesn't earn enough money, takes advantage of his father-in-law's love of customs and makes full use of the erotic technology he has cultivated. And Yuria, who witnessed the two having sex, also opposes her older sister.
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