Im looking for this one shoujo i read a couple years ago. The description is that a younger sister(A) looks up to her older sister(B) and believes that thers no on out there good enough for B. So when A heard that B had a boyfriend/fiancee she went out of her way to test him out. In the process she accepted him and fell in love with the guys younger brother. And i think later on he moves in with her or lives in same building as her. Its broad but if anyone knows it, id appreciate it.

It KIND OF sounds like V.B. Rose, but I doubt that's it.

It's not V.B. Rose. No younger, older brother in there. Idk, maybe...Missile Happy! ?

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Yes. That ones it. Thanks and sorry for taking so long to reply.