So... Shen Yuan (sy) is a millenial who choked on his food while reading a harem novel called Proud Immortal Demon Way (he dies cursing the novel because of the drivel it was full off, the unscientific sex it had and the stupid ending it gave his favorite protagonist) and then he found himself waking up on the blood covered floor with a pair of shiny boots right before him.

"From now on you shall go by Douma.."

Sy slowly raises his head to look at blood red eyes and gulps, instantly connecting the dots.

"Because I'm in a very good mood, I'll give you the prey that I hunted, don't waste it."

Oh fu*k fu*k fu*k shit shit shit Douma I'm Douma omg omg omg that's Muzan! ahhhh Demon slayer!

Muzan frowns hard and asks what that thought meant and how did he dare call him by name and you know, all that egotistical talk when suddenly he zones out.

Assisstance system activating Protection Protocol.

Quick Save Editings

Target Muzan Kibutsuji

Role: Main Villain

This is what sy hears as Muzan seemingly loses his train of thought and instead says, ''what language are you thinking in? You only know japanese and the western language of English then why do you know another one too?"

Sy:...

System:... Oh shit i didn't cover it up

Sy immediately screams internally ''aaah you! whatever you are inside my head!! what did you do!!??''

System: host is ungrateful.. tsk just quickly say you thought in a mix of French, Russian and Chinese, and that you learned it to impress your cult.

sy quickly says that, but muzan says that he doesn't remember seeing anything like that in his memories.

sy is already panicking when system again saves his ass by saying,

Assisstance system activating Protection Protocol.

Memory Altercations

Target Muzan Kibutsuji

Role: Main Villain

And suddenly there are memories inside muzan's head of 'douma' diligently learning these languages. but he's still vexed and asks douma why he thinks in another language, to which he gets the bullshit reply that it was for practice, so that sy will be fluent in the languages, but later it just became a habit to think like that. (sy is pretty good at bullshitting his way out of things). Muzan, that suspicious coward, asks why he learned these tough languages of faraway lands that probably no one will understand, to which sy replies that he did it so that he would sound mysterious to his cult members, who would be unable to understand what he's saying but will know it is a language, and sy could even say it's the language of Gods and he will get away with it too.

muzan is, frankly, pretty impressed by his thought process. So is the system, who knows now that its host isn't sooo useless.

Finally muzan leaves.

But sy now has a whole new problem to deal with.

Which includes a dead body, lots of blood, and painful, downright deathly hunger.

sy had figured out that he's not yet fully connected to his new body, that even though he's able to control it, he's not feeling all of the pain and hunger he's supposed to feel. which is bad considering that he's settling in fast... and the hunger's already pretty hard to tolerate.

system tells him muzan is faraway, so he throws the dead body (dead body that's a dead body shit shit shit shit shit) out the window all while thinking F*ck you and your gift you coward! in safe Russian language.

Then he starts to dig into the ground, a deep ditch to hide himself in when the hunger takes over all of his thoughts. system asks him what he plans to do, to which he says he'll try to sleep, and if he can't, to then knock him out.

It is at this time that the system explains its presence to its host, saying that originally sy was supposed to transmigrate into pidw as the scum villain shen qingqiu, who dies by being ripped to pieces and tortured by the protagonist and put into a pickle pot and all that torturous things (sy shivers, hard, not knowing if he's lucky or unlucky, being that he's still a scum villain), but because of some complications, he was transmigrated into what he read b4 reading pidw, which was surprise surprise, Demon slayer manga!

sy is told that he's kinda free to do as he pleases and in fact has the mission to lessen the angst in the manga. sy is given the privilege of an assistant system that will help him in his endeavor to lessen the angst, but sy just hates that he's douma now, a cold hearted man (or well, woman) eating monster. the system says he should be glad he isn't in pidw because his system would've been different then, and who knows, he might have had to follow the plot too.

Finally sy shuts up.

∆Π∆Π∆Π∆Π∆

Shen Yuan dug into the dirt hard as the system decided that it had told him enough, hands shaking, dirt getting under his brand new claws as he digs and digs and digs, all the while the hunger burns under his skin and burns his organs and there's sweat trickling down his burning temples and down his chin and-

Oh.

Oh no...

That thing trickling down his chin is not sweat, not sweat at all, it's saliva, and he's so f*cked-

And he's already so far down but the blood on the ground above him smells soo good, perhaps a lick-

He stuffs dirt into his mouth and nose and whimpers as he keeps on digging and digging and digging, and he knows he's crying right now as scratches form on his hands that heal all too quickly and oh that's never happened before, he used to be a sickly young master who couldn't even lift his school bag and now he's been digging for an hour, and he's really a monster now, huh? A man eating, horrifying monster who should definitely walk into the Sun-

Host!

The system seems to finally realize that not talking to its host is sending said person into a panic attack with lots of suicidal thoughts which is. Not. Nice. And also that perhaps its host isn't coping so well with his role.

Host this much digging is enough.

'But I can still smell-'

This system can shut down hosts five senses, though it will not help with the hunger.

Anything, anything will do, but please, not that smell, anything but that smell please, I can't-

And then his senses were suddenly... gone.. like they didn't exist.

He couldn't hear the occasional birds chirping, the night wind whistling through leaves, the heart beats of the humans who are sleeping unaware to the danger right between them (and he's so glad-).

He can't smell the dirt around him, on him, in his mouth, nor the blood, that of the gift, or his own. He can't see where he's going anymore nor can he feel the dirt under him and around him, caging him in, and even though he still feels the unbearable hunger slowly overtaking his mind, at least temptation isn't right in front of him anymore, for which he's grateful.

'Thank You system..' he tiredly thinks back as he still keeps on digging.

And apparently he can still hear the system, even if nothing else, because the system promptly replies,

Yes host, now please stop digging into the ground.

'I'm sure you can't keep the senses locked forever right?

No..

'I don't want to wake up to the sound of heartbeats or the smell of blood, so the further down I am, the better for me.'

The system silently let its host keep on digging into the ground with his quickly waning strength. It watched as its host started whimpering and crying from the pain of the cramps in his stomach, all the while keeping up a barrier between its host and Muzan, thin enough that the demon progenitor only thinks his new creation is just a hungry little thing.

Its host finally lost the remaining bit of strength in himself and collapsed, face planted, in his self created tunnel, or coffin, covering himself right in the opening of the hole with more mud, all the while shaking with hunger and desperation, his elongated canines pressing into the piece of wood he'd tore out of a table in the room before he had started his little project.

Shen Yuan proceeded to cry himself to a restless sleep, full of nightmarish red eyes.

The system decided to not tell its host Muzan's new decision to acquaint himself with more languages, just so he can hear the thoughts of his demons. It knew now wasn't the time.

It also decided to completely knock its host out into a dreamless state after the tenth muffled scream bounced around the tunnel.

∆Π∆Π∆Π∆

Far into the future, a certain hack author who had been electrocuted to death while publishing the final chapter of his PIDW, opened his eyes to find himself precariously balanced on a tree, the angry shouts of an old man roaring up at him from the ground shocking him enough to send him tumbling down said tree, face planting on the ground.

As Jigoro's eyes widened in disbelief of that brat falling down (this koala has such a tight hold, how did that even happen?) from his perch, he heard the terrified screams of said brat, the language he was speaking incomprehensible to him.

Airplane Shooting Towards The Sky, the infamous author of PIDW, was screaming in Chinese, "Oooooh nooooo I'm Zenitsu, I'm Zenitsu, I am Zenitsu! Aaah! I can't fight I can't hold a sword! Aahhhh!"

Airplane bro, who had just got the memories of his past life back, also remembered that he used to be an insomniac in said past life.

New panicked screaming ensued, stopped only by a strike of lightening knocking him out.

Oh things were sure gonna turn interesting when Zenitsu, aka Airplane's system decided to activate.

Notes:

sy isn't doing well.
zenitsu is airplane, airplane did not the steal his body, like the case for doum and sy. he just remembered his past life.

also airplane too is a character from the same book sy is from. he's the writer of the novel sy loves to hate, they have a writer and his critic turned reluctant comrades for survival type of relationship.

And all those expecting to see Douma/Kanae or Douma/shinobu or Douma/Akaza or Douma/Kokushibou... this is not it for you... in fact there's not even that much romance (or none at all, considering that this is just an idea... with a few scenes in between..) and also that i hate douma... and said person isn't even aware about.. oh you'll see that when you read more, i guess!

again, i haven't read demon slayer manga (i watched the anime seasons and movie) but i have done my research on the concerned characters of course, if some facts don't add up pls tell me! and I'll try to think of a way to fix it and correct this up!!

happy reading!!

please leave comments for me, i don't know what I'm doing so I'll be happy if you point my mistakes out! They will help me a great deal, and if u like these ideas, share your views, they are my motivation!

Please Leave Comments bbyeeee!

#also posted on AO3