Brotherly Advice {A Zeref X Lyon Oneshot}

Okay so this story was requested to me by a wonderful person by the name of @vampireknight64 so I thought "Why not make it then?!". Anyways, as you can see in the title this story will be about Zeref X Lyon (With a hint of Gratsu). Oh and this will be a AU also so keep that in mind! Hope you enjoy!