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Hina's mother and Kenta's father have just remarried, so the two became sisters. Hina is an extremely smart but very shy girl, she was chosen to become a representative to read the speech at the university graduation ceremony. Kenta was as shy as Hina, but he was not as smart as his stepmother. Therefore, parents asked Hina to accompany the pair to help Kenta pass the upcoming university exam. But Hina has a secret that others don't know, that she loves sex! Every day Hina "accidentally" rubbed his breasts on Kenta, and his underwear exposed his cunt in front of him. Even when Kenta saw the scene of sex with her boyfriend, Hina deliberately let him see more clearly. Unable to resist the charm of the stepmother, the two stealthily fuck each other right in front of their parents! Of course, his parents did not discover because Hina used his long skirt to cover. But even so, the two still have to try to limit the noise, proving normal as possible. The stimulating feeling when it could be detected at any time made Hina feel extremely excited. She even caught Kenta fuck and ejaculated in her cunt! And from there, in front of her parents, Hina proved to be her sister who cared about her brother, trying to help her study. But in fact, the two are stealthily fucking each other non -stop ...