The Yandere Sister Just Wants Me to Bully Her

Gu Xing, a novelist, deeply detests manipulative women who play coy, so she intentionally created such a main character for her webnovel, so she can abuse the fictional character in all sorts of ways! However, she never imagined that she would end up transported into her own story, and now she gets to take it out on her personally! But due to her own fetish for pretty girls, she couldn't bring herself to harm the beautiful protagonist she created, and she eventually ends up becoming her protector instead… As she was worrying about her own mixed feelings, the supposedly helpless protagonist pushes the male lead away and insistently confesses her love for Gu Xing instead! What! So I was the one being protected all along!

(Source: Bilibili, translated)