Zeref's Daughter (Fairy Tail)

Lucy has a secret. Jude isn't her father. While on a mission for money for a medicine that cures the sickness Natsu has, something triggers her powers. She starts to change. In love with Natsu, she leaves not wanting him to see her like that. She especially did NOT want him to know that her father is his mortal enemy. She goes to Sabertooth. Will she fun a new life, friends and love there? Or will she go back to Fairy Tail? And what happened to Achnologia?