Riona and Shun's siblings, who lost their mother when they were young and were abandoned while leaving a large amount of debt to their father. One day, my uncle, who had taken care of me before, finds and visits their house. However, the purpose of his uncle is Riona's body, and she puts Riona to sleep and attacks her. And Shun who gets an erection when he sees it ... My sister decides to teach her the right sex to her confused younger brother.
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