FriEND of Fairy Tail.

"Na-Natsu?" Came a shaky voice behind him.

He jumped, not expecting to hear anyone, and glanced behind him. Lucy was standing there, the Book clutched against her chest. On the Book was an open letter.

"You shouldn't be here." Natsu growled.

His eyes flicked to each of the people with Lucy. His heart sank to the pit of his stomach. Gray, Juvia, Laxus, Erza, Gramps, Cana, Romeo, Mira, Elfman, Freed, Gajeel, Wendy, Lizana... Lucy.

He never wanted them to see this.

He never wanted them to see him like this

sorry, i'm crappy at titles.... > < (and yes, my friEND, pun intended XD)
So basically, Natsu finds out he's END and has the power to kill Agnologia, but he feels guilty for being the cause of all his friend's suffering, so he comes up with a way to kill himself and Agnologia and Zeref at the same time, trying to do it without alerting his friends of his suicidal mission, and without letting them know he's END.

spoiler, they find out.

mentions of other ships, but mostly NaLu, sorry if any of the characters are outta character, it's been a while.