Anyone remember that one manga with those yandere twins that love each other. So basically...

Anyone remember that one manga with those yandere twins that love each other. So basically the twin sister loves her brother and is always clingy towards him, she would even hurt herself to get his attention. But her brother is going out with this one girl and is kinda ignoring his sister. The sister got mad and ended up getting close to another guy to provoke her brother. It worked and I think the brother did "it" with her. THat's all I remember, someone pls help(〜￣△￣)〜