My Super Possessive Older Sister

[Single female protagonist, sister-brother relationship, strong control, slow pace, non-peaceful world view] (I haven't written it yet, I won't write it, don't read it) This book is sweet in the early stage and violent in the later stage. If you don't like it, don't read it. When he was a child, a car accident brought bad luck to Yang Zimo - both his parents died. Yang Zimo can only live with his grandmother. Originally, Yang Zimo thought that he would live in the shadow of his parents' death, and perhaps his life would only be gray. But the appearance of Su Yiqin was the salvation of his life, and Yang Zimo was also her salvation. During Yang Zimo's third year of high school, Su Yiqin disappeared from his sight and deleted all his contact information. Yang Zimo thought their story had ended here, but she told him to wait for her. Six years later, Su Yiqin returned from a "business trip" in Shanghai, and their story continued to be serialized. "Momo~, I... Like you." … "Momo, do you still want to leave me?" "Hahaha! Then I can only trap you~" "Don't blame me, sister, because I love you so much!" The introduction is short and weak. Please read the main text for details. [The author is writing a book for the first time, so please give me some advice if there are any mistakes.