Ok ok this is my theory on how Laricade came to be and natsu became an uncle

(Zeref is holding Mavis’s dead body after their first kiss…..)

Zeref:“No Mavis!!! Why?!?! Why did you have to go?!” (Spots a pack of condoms) “And it was going to go places!!!! Wait….” (he gets a devious look on his face"I got an idea!“
(Zeref takes Mavis’s body to a secret location and throws her into the etherious process. He looks at her body while she is floating in the goo)
Zeref: (blood coming out of his nose in a perverted manner and rubbing his hands together) "heheheh, goodbye virginity, hello EMV.”