imagine several months have passed since the exchange program, the bros are asked by diavolo to go to the human world and investigate a rumor about a demon unlawfully making humans fall into temptation. how would they react when the find out that the perpetrator was mc, who used to be human? (make it angsty and extra painful please and thank you, i lov ur headcanons)
hey!! honestly i kinda struggled trying to figure out how i should make this ~super angsty~ and i was slightly confused in how to interpret this prompt, so i hope my interpretation is satisfactory! this is such a clever prompt, thank you! (and thank you for supporting me!!)
[for this headcanon, lets assume that upon turning into a demon, its hard for mc to access memories from being human... and that their demon form isnt as human as the brothers. also i didnt know how dark you wanted it but tw for blood and death/violence descriptions!]
with trust, diavolo sends his best companion to investigate the mystery
he studies the day before on recent locations to get an idea of where this demon might be
he leaves the house early next morning heading to the last known location of the demon
it stood as if it were searching for yet another victim to tempt, and lucifer decided to make it known of his presence
“there is no way i, lucifer, could lose to something you, so maybe itd be wise to admit youve lost”
but allowing the demon to hear his name was a mistake, as it screaming his name sent him flying an acre
the only time he has ever felt power that strong was from your pact
it became very clear to him that not only you were the corrupted demon that stood before him, but also the pact you two shared was not tainted
lucy knew he was at an unfair disadvantage, but his pride couldnt let him flea
“end me right here if you must, mc, but at least ill die fighting”
hes terrified, but since lucifer is busy, he decided to handle it for him
he sent a few of his crow familiars to investigate where the demon was last, and proceeded to go to that location
“hey, uh, i dont think its wise for ya to be tempting humans, yanno”
upon meeting, he realises theres something off... he almost feels connected to it
but he decides to ignore the feeling
until he notices the demon wearing a ring he once gave you
mammon knew you felt familiar
but he learned fairly quickly the familiarity wasnt mutual when the demon punched his chest hard enough to shatter some ribs
you didnt care enough to fight him any more, and for some reason, that hurt him more
“i thought youd be the one to never hurt me”
originally he didnt want to go, but then he realised this could be like a video game where you kill demons but in real life
that made him quite excited
in fact, he has a game like that (not shocking) and so he believed his experience could come to use
he used methods he learned from the game
levi left a trail of common human items to lure the demon to where he was
it was quite successful but not in the way he planned, as the demon stood behind him snarling
he noticed the demon wearing what resembled a ruri chan friendship bracelet he made for mc
he held its hand to get a better view and ensure thats really what it was
“mc... that cant be you in there...”
the demon pulled away from him abruptly and ended up slinging levi 20 feet across the ground
he couldnt tell what hurt more... his back from the impact, or the fact he lost his only friend
hes way too excited about this
he gets to be a detective AND punish the demon in question once he finds them? this is like a dream to him
it shouldnt be difficult because theres no way he could lose a fight being one of the most powerful demons
satan follows a trail of footsteps that seem to accurately match the descriptor diavolo gave him
to his surprise, the demon was already there
satan feels as if hes solved the case, but he still has to take the demon back to custody
“look, sorry but im going to have to kill you. if you want, you can cause trouble and make this more fun for me when i torture you.”
the demon turns to his direction and he sees a faded pact mark of his on skin that used to be human
satan tried backed away but the demon managed to pierce through his stomach with its finger
hes never once shown any hostility towards you... but he now knows youre really not you anymore
and as he lay on the ground coughing up blood, he regrets showing peace
he really doesnt want to do this, but because asmo is capable of charming, diavolo thought hed be the best fit for this expedition
all of the reports regarding the demon making humans fall into their temptation were from the same location, so he heads there
he sits on a curb in the near vicinity waiting for any sign of movement
when he hears the sound of growls approaching, asmo puts down the majolish magazine he was reading and gets up with a smile
“wow, a fiesty one are you! we cant have you causing more damage so if youd just look into my eyes, thatd be wonderful!”
asmos smile falls when he notes how familiar those eyes are
“mc...? i- how? how did this-“
with no effort, you slash his chest with your claws and he falls onto the ground bleeding
he never could charm you, could he...
because of beels excessive strength, diavolo thought sending him to handle the demon would be best
he packs a good 125 snacks to take with him
he laughed to himself on the way, thinking about how the last time he willingly walked into a battle was the war
lost in his daydream, he ended up walking into the demon he was looking for
the smell was all too familiar, and he quickly made the connection regarding who this demon was
“mc! i missed you so much”
almost as if he forgot the circumstances, he tried to hold you in a hug
the demon reacted suddenly and aggressively, throwing beel to the ground
he would have taken more damage if he didnt offer some of his food as a peace offering
regardless, the blow to the back didnt hurt as much as his heart did watching all that was left of both his sister and you walk away forever
the only reason he went through with investigating was to satisfy his own curiosity, not because diavolo wanted him too
he went to the human world himself to the location of the last known incident and waited
he walked around a bit before he saw a demon sleeping on the curb
one thing about belphie is he always remembers how someone looks when they sleep
“theres no way this is mc...”
belphies voice startled the demon awake and it started fighting as a result, puncturing his chest and leading him to fall to the ground
“i killed you once and ill kill you again if i have to!”
thats something he never thought hed say and his eyes water as his heart aches knowing the one he once loved stands in front of him like this
blood rushing out his heart, he decides to use his twin telepathy one last time
