To Keep Her Safe (Magcon-Type-Fanfic)

I don't know where this story will go, or where it will end, but Katie is Shawn Mendes' younger sister. She has had it rough since he left to tour the United States with his friends, that Katie has never met. If Shawn comes back for her, will he take her away from her, now, abusive parents, and sinister aliens that breathe the air of her school in Toronto?