User blog comment:Alexander Dragneel/NATSU EATS E.N.D/@comment-24934658-20140728223349

I think E.N.D is either a relation to Natsu or the relation to Igneel therefore Natsu won't kill him/her (remember E.N.D.'s gender hasn't been fully clarified) and that Gray will be the killer of E.N.D which will cause Natsu to be upset with Gray.