[JUFE-101] Chị em không được bảo vệ, chị em ngực bự bị em trai xuất sắc của mình mắc kẹt liên tục. Cô ấy có ý định quyến rũ em trai trinh, nhưng đã xảy ra một sự đảo lộn không mong đợi!
Yuzuru, who had entered a prestigious boarding school famous for table tennis and was leading a club-filled life unable to develop immunity towards women, had returned to his hometown after a long time. On the other hand, Yuzuru's sister, Ai, also returned to their parents' home after a quarrel with her husband. Stressed out, Ai, during a conversation, learned that Yuzuru was still a virgin and, intending it as a joke, teased him by tempting him, but the naive brother, in the midst of puberty, took it seriously and clung to his sister's voluptuous breasts... eventually ending up ejaculating inside her...
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