This book is a Zeref x reader. you are a dragon slayer ( all elemental) and your supper strong . In this Zeref is already part of Fairy Tail and Mavis is Makarov's granddaughter . Mavis is trying so hard to make Zeref he boyfriend until she realized hes fallen in love you. a lot of stuff goes on and you almost kill Mavis, but you don't you felt so happy but still hates your self for doing it.