My band mates girlfriend sister! (A 1D Fanfic)

Louis and Eleanor are perfectly happy, Liam and Danielle couldn't love life any more than it is, Zayn and Perrie are moving in with each other, Harry and Brooke have finally started to date. So where does that leave me? What am I supposed to do? I'm not happy anymore and I need someone in my life. I need my princess! But what happens when she shows up? Will relationships break? Will friendships end?.....