Attack on titan (AOT fan fic)

Name Diana my whole life has been underground and being taken care by Levi one day Erwin the commander of the scouts come and takes us away we accept to succeeded a mission but in that mission everything goes down and we loose Farlan and Isabel and now it's only me,Levi and Vanessa, but there is this dark secret of Diana that she won't keep it for long. A Levi x reader story