Once in a Lifetime (BTR) (S1)

What if Gustavo had a niece? What if she went with the guys through their journey? Meet Rainey or Rai, as the guys call her. She's grown up with the guys and now she's following them to LA. What if she falls for one of the guys? Will she win their heart? Or will it destroy her? Read and find out. I don't own anything except Rai, Layla, and any other OC that may show up.