My Big Brother Natsu-A fairy Tail Fanfic

This story is a battles between the existent Dragons and Dragon Slayers as a little girl between the very path of them both. Natsu and Zeref's little sister makes her appearance in this book.While looking for her brothers she has been taking captive by many scientists being planted with many different Lacrima but also had been trained a Dragon Slayer(even the directors don't know about her and her name....wait i cant tell you.tats for you to figure out.