Blue Fairy (blue exorcist x fairy tail)

what if one-day team Natsu get's a job request to observe Satan's son, and if he is to get out of control to kill him. And the exwires get a mission to "take care" of the fairy demons. But what if they realize that they don't what to hurt each other, and become friends instead. also, this will be in 3rd pov unless it says something else

credit goes to the creator of the blue exorcist series
the creator to the fairy tail series
and the artist to the cover