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Summary:

What if something went wrong when sealing Rin's flames ?

the one nephilim have now become two beings.

a demon made of blue flames

and an ordinary human boy

seperated but subconciously still completly connected

how will the world turns out with this small changes ?

Notes:

i like demon rin and human rin

so why not both ? ꉂꉂ(ᵔᗜᵔ*)

This au has been spinning around in my head for weeks. So sorry for anyone who's waiting for 'in our guts we trust' update (π=π)

(See the end of the work for more notes.)

Chapter 1: Congratulations! You’ve acquired children. Welcome to parenthood!

Chapter Text

In another universe and different timeline, a pair of twins born in the winter under an unfortunate series of events. The older twin inherits the demonic part from one of their parents while the younger is too physically weak to shoulder it. Thus he’s mostly human.  

 

On that tragic stormy white day, after the seas of blue flames consumed more than hundreds of victims, a mother and that pair of twins was sentenced to death. But a skilled exorcist, that will be known as the strongest Paladin, Fujimoto Shiro, defies the Vatican order and instead flees with The witch and the hell spawns. 

 

Unfortunately , the mother has become very weak after childbirth and couldn’t survive long.  

 

Fujimoto Shirou who has become a fugitive and has lost a very dear person to him that day. He considered giving up and following her in the afterlife but changed his mind when he saw the twins crying. 

 

Her face came to his mind as he remember the last word she uttered with her dying breath 

 

‘Be good brothers to each other’

 

The mother of the twins, Yuri Egin, the dearest person in his heart, is a very kind, caring and understanding person. And as a mother, she would want to see her boys live and grow up, healthy and happy.

 

Yuri entrusted him with her children.

 

And so, Fujimoto Shirou did the one thing that he could do at that time 

 

He sealed the the older twin’s flame inside the Koma sword 

 


 

In that universe, Fujimoto Shirou planned to bring the twins into Mephisto’s care. but unfortunately for him, the twins would grow up and be raised by him thanks to losing a bet with that clown. But maybe it’s a blessing in disguise because Fujimoto Shirou, the strongest paladin, eventually came to care and love his boys very much.-even Mephisto got perturbed by it. Seeing that rascal clone who had the audacity to demand things from the king of time and space evolved into a doting father. It is very fascinating and interesting-

 

In that timeline, the oldest twin’s demonic heart was sealed as he grew up and eventually broke the seal in a matter of years. He then would go through many ups and downs throughout his life as he discovered more about himself and everythings around him.

 

But in this timeline, something went wrong when Fujimoto Shirou sealed the flames. 

 

It completely separates the eldest twin into two beings. 

 

A single nephilim has now become two whole people. A regular human and a very powerful demon whose power could grow to the point of rivaling Satan himself.

 

The thing is, nobody knows about the split up except one person.

 

Not Fujimoto, and Not even Mephisto -he doesn’t even know if it was possible in the first place- so both of them would wait days after days observing the eldest twin for any demonic traits that would pop out throughout the years. Like super strength or faster regenerative ability. Thankfully, none of it ever came about. -to Mephisto’s disappointment-

 

But, unsurprisingly, Satan is the only one who seems to know what is happening. 

 

How ? 

 

Other than being omniscient and omnipotent being, his word, -and maybe a slight stalking from the white haired exorcist’s eyes,- a ball of small blue flames that suddenly appears in gehenna gives him more than enough clue to what is going on. 

 

The little ball of flames emitted the same heat as his flames but also formed into humanoid form that resembled a newborn infant instead of just all flames like his.

 

Satan doesn’t really know what to think of this situation

 

On one hand, half of one of his spawns is with him in Gehenna. 

 

That means the other half who’s completely separated form is now just ordinary human. It’s going to be a perfect vessel for him since that body originally can house the blue flame

 

But what about now ? 

 

Other than being just an infant, that body is completely human. 

 

Would it still be able to house him when he’s an incomplete being ? 

 

And what of the small blue bundle in front of him ? 

 

Satan could just kill him easily. He has no need for it. 

 

He just need the vessel 

 

But 

 

What if killing one of them resulted in both of them being dead ? 

 

A whole soul shouldn’t be able to split perfectly like this in the first place. That cursed exorcist really has done something unthinkable. 

 

‘And that bastard didn’t even know what he had done.’

 

Looking down on the abomination in front of him, Satan let out a disgruntled sigh -as disgruntled as being sentient flames on top of grotesque pillar in hell can be anyway- at the little creature munching on his pillar while making unhappy noise. 

 

“....you know that you can’t eat that right ? Are you hungry or something ?”

 

“Bahh!”

 

“I have nothing. If you want food, go get it yourself.”

 

“Bahhh! Fuhhh!” 

 

The little brat had the audacity to look annoyed at him. As if the god of demons is just a minor inconvenience to his business. And That is to chew on a definitely not edible pillar of flesh -Satan would know he tried it before. Taste like a month old, frozen bacon that haven’t been thawed out yet- 

 

“Well, This is hell. Get used to it”

 

“Wahh! Fuhaa!”

 

This little runt keeps screaming and yelling at him until he gets that it’s useless to try to order Satan around. So he just kept on munching on the pillar of flesh while ignoring the piercing glare that he received. 

 

‘The little bastard didn’t even have a tooth yet’

 

This abomination is already giving him a headache even when he’s only a newborn. And Satan doesn’t even have a head.

 

Keeping this little brat alive could be a problem since he would definitely want to go back to his other half. That means They are going to compete for the same vessel. Not that Satan is worried that he’s going to lose, especially to freaking a child. 

 

But the moment he tried to smash the little bundle into the ground of flesh and bury it alive, the face of a sad woman kept flashing in his mind. Satan doesn’t like this feeling of bittersweet rage, despair, sorrow, and emptiness it brings. The feelings that he discovered and identified when that witch rejected him. 

 

Forget having a vessel

 

Satan should just kill this runt and the other half to settle the score with that witch. 

 

they could have had everything together. He gave her his trust and everything. She’s his everything in that cold laboratory -where eyes from all around look at him with a piercing and even sometimes, hateful gaze. Those lowlife doesn’t even realize who they are dealing with- and instead of acceptance from the one person he actually wanted to have connection with, he’s met with ‘rejection’.

 

 -it feels like a slap on his face when he realizes that his previous vessel is a clone of that cursed exorcist. He’s not blind to that witch ‘longing’ eyes for that man- 

 

So in theory, he should just be done with it and kill the little brat. Lucifer already swore and even made a bet with that sketchy Samael guy, to make him a perfect vessel, so why not ? right ?

 

Then why does he feel a burning sensation every time she comes into his mind ? 

 

Why does it still hurt so much ? Why does he still longed for her after everything ? for Yuri ?

 

He tried burning the little runt with his flames while turning away and singing loudly -birthday song of all things. Yuri sings that to him once when they decided when his birthday would be. That sweet giggle she let out when he said  ‘everyday will be my birthday!’ is still on his mind- Satan swears that it’s not him being a coward and trying to run away from the guilt. He’s a demon. And a god

 

A god of demons doesn’t feel things like guilt. Especially not when the little shits starts hitting his pillar in frustration with that small hand of his -no claws, no horns, no thoughts in those eyes. Except being hungry little menace- . Tail swishing around like a frustrated cat while stomping his feet on the ground.

 

just like his mother whenever something manages to receive her ire. like when he would sometimes give her some cool stuff that he found. -It could be flowers or toys and even those shiny stones other humans keep flaunting around- she would always tell him to ask first and nicely. And  he did! It’s just that most of the time they wouldn’t give it to him so he just went with the plan B. It always worked and he got what he wanted ! He could never understand why she would give him that disapproving frown everytime.

 

Yup. It's clearly not guilt. So into the pyre the infant goes.

 

“Bwahhh!”

 

But of fucking course, instead of cry of pain, the little brat just looked mildly amused at the fire before resuming his mission to slobber and chew the pillar. Of course his shit spawn would be immune to the blue flames. Just great 

 

When the brat grows up, he would definitely be a threat to his throne.

 

wait , no

 

Not when , but if

 

Something is wrong with him

 

Did this brat actually develop a new ability that could influence him or did he inherit that witch's weird charm and casually snared him as a baby !?

 

“YOU! What sorcery have you done to me, you little shit !?”

 

“Bwah?” the baby just tilted his head and looked at him as if he’s questioning his sanity

 

“Gah! Stop looking at me like that ! you useless pile of shit! Or i’ll burn you!”

 

“Bwah, fuwha!” this little shithead had the audacity to stare him down while hitting his pillar with that baby hand of his. As if he’s really daring Satan to do it 

 

“You-! Ugh! Stop looking at me like that! You should just die! Go follow your mother in the afterlife and leave me alone!”

 

“Gahh! Bwahh!” 

 

“No- wait- what are you doing!? Stop! Stop this instant you little brat!” Satan did not panic. I repeat, Satan definitely did not panic when the infant crawled up his pillar and sat on top of it, inside of Satan’s form. It is not panic that seeped in. He's just very surprised witnessing the audacity of his newborn infant. 

 

“GAH! GET OUT ! GET OUT! YOU PIECE OF SHIT-!” He tried to expel the little runt out of his flame form but unfortunately the lack of hands or any limbs makes it very difficult. Especially when the little bastard began messing around from his inside and manipulated his flames all around the place. 

 

“What the fuck are you doing !?” Satan’s rage has gone up so high along with his form towering large from atop the pillar. Any demons within the vicinity flee lest they have the unfortunate luck of becoming bbq today. 

 

“Bwahh! Bahh!” The little shithead totally ignored him and seemed to be looking around for something. He sniffed a couple more times before looking in one direction. 

 

“....you- ah fuck…fine! You’re hungry, I get it. fine ! I will give you food but you better get out of me or I will make sure all of the prey that you hunt will flee far away from here!” 

 

Satan is still pissed off but he really didn’t like having the little bastard inside of his form -it’s like an annoying piece of food stuck between his teeth and he couldn’t reach it even after deepthroating his fingers- he was impressed with the little shit’s hunting instinct. He’s definitely a little hell spawn. 

 

Satan made a small ball of flames and directed it to the direction the infant is looking at. He found a small rabbit yokai. It probably got abandoned by its parents a few days ago. He then called out to that rabbit. Its face looked horrified at the call of its god and seemed to consider running away. But eventually the rabbit yokai went over to Satan’s place with a resigned face. 

 

-Running away and fleeing from a high ranking predator is one thing but not answering the order from their god would end even more badly for any low level demons-

 

“So ? go ahead, you little runt. Your food is here” Satan urged unkindly and sounded very done with everything. 

 

The little ball of flames shoots out like a bullet towards the rabbit yokai. Immediately killing it. Devouring it like the little beast he is.

 

Satan just looked mildly annoyed at the mess left behind after the little shit’s feast. 

 

“.....why can’t you just choke and die ?” Satan almost exploded again when the little shit took a nap right beside his pillar with the most peculiar pose. The little brat sleeps like a human in the middle of possession. All twisted in the most uncomfortable position that even a professional contortionist would wince in pain..  

 

Did Satan accidentally tap into Samael’s domain ? Why then did he feel like he just ages 10 years ? is this what parenthood is like ? the human race must be masochistic for wanting to keep their birth rate above the mortality number. Willingly popping these little monsters into existence.

 

Speaking of -surprise- parenthood, Satan wonders what that cursed exorcist is doing right now. He got two while Satan only has one -it somehow makes Satan pissed off. It feels like he’s losing to that bastard again- 

 

So, he secretly took a peak from that asshole’s eyes. Having possessed that body once makes it a lot easier influencing a part of it. he does have to commend that accursed exorcist for having such a strong will and mind. 

 

But it seems his prior assessment needs to be recalculated because what he saw is not the man who managed to fight him off with only his will. But instead a weary man on the verge of breakdown as he tried to calm two loudly crying infants. 

 

“Wahhh! ahhhh!”

 

“Ahhh! Rin, don't cry! Here’s mr. cuddly! It’s okay! Yukio is just taking a nap right there! See ! so please don’t cry! Or Yukio will also-!”

 

“Wahhh! wahhh!”

 

“Ahhh! Yukio! No, no, no, it’s okay! There, there-” 

 

“Wahhhh! Wahhhh!

 

“AHHH! PLEASE DON’T CRY- BOYS-!”

 

Satan turned off the connection. And looked down at the little beast sleeping calmly beside his pillar. And for a second, he believes in divine intervention. Because holy shit! He did not envy that man at all. 

 

“Pfft-! Serves that bastard right!” Satan felt familiar joy tingling his demonic instinct. Schadenfreude, harm joy, is the human word that is the closest thing that explains the feelings of elation all demons felt seeing human suffering. It’s very addictive, especially for him.

 

After laughing maniacally for a whole minute, Satan calmed down a bit and recalibrated his situation. What should he do now ? Especially with this little runt?

 

Can’t kill him with his flames and he would receive mental damage if he did it the old fashion ‘tear him to the ground’ . There’s also a fifty-fifty chance of losing a good vessel along the way. 

 

Can’t keep him alive because he’s a big threat to his position and plans.

 

“.....” Satan looked over to the sleeping infant who doesn’t seem to be bothered or even disturbed by his cackling and looks just as peaceful as ever. The god of demons used his flames and moved those tiny limbs into a more…normal position. It’s not out of kindness. It just freaks him out a little seeing the little shit imitating a pretzel in his sleep.

 

What are his plans again ? 

 

At first, it was just to show that humans and demons can live side by side, just like what Yuri wants. But then the betrayal comes. He learned the valuable lessons that humans and demons are just incompatible and all of them still fall on the rule of nature.

 

‘The strong rule the weak’ . 

 

They all are the same. 

 

but unlike demons who freely show their nature and act on instinct,  the humans just like to hide their nature and deemed the things that they didn’t like as ‘demonic’. -condemning themselves and the whole demon race in the process- they add unnecessary and complicated things like ‘morals’ and ‘the good of humanity’. 

 

As if there’s such a thing in the first place. 

 

All of it is just superfluous 

 

They took control and enslaved demons to do their biddings. Experimented on them like animals and justified it saying ‘they’re only demons’ then got mad when demons retaliated and did the same. 

 

What a fucking joke. 

 

His previous dream are so unrealistic 

 

Why did he want that in the first place ?

 

Oh 

 

Right

 

Because of her 

 

Yuri

 

He wants to be just like a human because of her. -The thing that he comes to loathe with his every being.-

 

Because he wants to live with her 

 

Do everything together 

 

Everything is fun with Yuri 

 

But she isn’t here anymore 

 

Just two abominations that’s left in her death. 

 

And now,  one-half of those abominations somehow defies the structure of nature and becomes an even more atrocious existence.

 

And what are his plans now ? What does he wish for ? 

 

A vessel ? a body ? yes 

 

He wants to live. There’s no doubt on it

 

But for what ? 

 

To show humanity who’s boss ?

 

to conquer it and show them how little the difference is between humanity and demons ? to force humanity to accept and face their true ‘nature’ just like demons ? to what end ? So both mankind and demons finally found a common ground and hopefully can get along ? Isn't that just Yuri’s wish again ?

 

Satan could enslave all of humanity or just make it go extinct. 

 

But that would be boring.  

 

There’s a deeper reason why demons gravitate towards humans and would sometimes actively reach out to them. There’s just something that triggers their instinct to create chaos and makes the humans get involved. 

 

Humans in general are just very different from demons that most of the things they find about mankind can be categorized as fun. And ignoring other grievances in that lab, Satan definitely did have ‘fun’ with Yuri. 

 

Then,  Why does he even have a plan, if it wasn’t going to be ‘fun’ !?

 

Humanity and demon kind means so little to him. so that means….he only wants to do that just to prove Yuri wrong ? 

 

Of course, it all goes back to her. 

 

It’s just her 

 

Yuri

 

“Wah!  hello! You’re pretty!”

 

“....Yuri…” 

 

“I’ll call you Rinka!”

 

“Yuri”

 

“Let’s eat, Rinka!”

 

“Yuri….don’t go..”

 

“Rin-”

 

“BWAHH!” 

 

“SHUT UP!” Satan blew up. Literally. The whole ground of flesh shaking and splitting apart creating a deep crater. The whole sky is burned with his azure flames. The infant who just woke up just stared at him, confused.

 

Every demon including the ones in Assiah instinctively stilled and became wary. Their god is angry -again-. Unfortunately it isn’t the usual temper tantrum where he would just complain and burn a few things. No. They know they need to flee and stay away from Satan’s vision or else. 

 

“IT’S ALL YOUR FAULT, YOU LITTLE SHIT!”

 

“Bwah?”

 

“YOU AND ALL THOSE INSECTS WHO CALLED THEMSELVES EXORCIST! ESPECIALLY THAT DAMN WHITE HAIRED BASTARD!”

 

“Wahhhh?”

 

“SHE CHOOSE YOU, YOUR USELESS BROTHER, AND THAT BASTARD OVER ME!” 

 

“Bahhh!”

 

“ME! THE GOD OF DEMONS! I COULD HAVE GIVEN HER EVERYTHING!”

“Wah! Wah! ”

 

“AND SHE REJECTED ME BECAUSE APPARENTLY, WHAT I FELT ISN’T ‘LOVE’.”

 

“Bah!?”

 

“YEAH! MY ‘FEELINGS’ AREN’T GOOD ENOUGH TO BE CATEGORIZED AS ‘LOVE’ IN THEIR EYES!”

 

“bah ! bah !”

 

‘Demons can’t be human’. ‘Demons could never understand humans.’ YEAH WELL GUESS WHAT !? HUMAN CAN’T UNDERSTAND DEMONS. SO THEIR CONCLUSIONS OF MY FEELINGS IS JUST PURE UTTER BULLSHITS!”

 

“Bahh! Fuhwa!”

 

“THEY CAN SHOVE THEIR ASSUMPTIONS UP THEIR ASS!”

 

“fuhwa !” 

 

“BECAUSE IT HURTS! IT. STILL. HURTS!”

 

“Bahh?”

 

“I FEEL JOY WHEN I’M WITH HER, OUR MEMORIES TOGETHER PLAYED OVER AND OVER AGAIN LIKE A BROKEN RECORD INSIDE MY HEAD AGAINST MY WILL!  I FEEL  BURNING JEALOUSY WHENEVER THAT BASTARD IS NEAR HER! ” 

 

“.....bwah..”

 

“- I FEEL DESPAIR WHEN SHE REJECTED ME! SORROW WHEN I REMEMBER THAT SHE ISN’T HERE ANYMORE, AND NEVER ENDING LONGING TO SEE HER AGAIN!”

 

“....”

 

“IF THAT ISN’T ‘LOVE’ THEN WHAT IS IT !? TELL ME!”

 

“.....”

 

“ANSWER ME !”

 

“.....”

 

“.....”

 

“.....”

 

“....i-i love her…”

 

“...pwah…”

 

“....oh fuck….i really love her…”

 

“....”

 

“....i love Yuri”

 

“...bahh…”

 

“....shit.”

 

Silence took over between them. If Satan still had a body, he would have been on the ground curled up in a fetal position and then eaten the dirt on the ground. Not cry, of course . Because the god of demons never cry. 

 

“...”

 

“....”

 

Fuck it. Nobody is here and the little brat is literally an infant.Even if he could understand what he had been yelling, Satan’s image was already ruined in his eyes anyway. He might as well bawled out and let out these disgusting feelings buried inside. 

 

That’s what Yuri always advises him anyway. She would lend her soft thighs so he can use it like a pillow and cry on it whenever he had a fit. 

 

So, Satan, god of all demons, bawled his eyes out, and for the first time grieved for someone. It’s a very disturbing and disgusting sight for anyone with eyes. Imagine a sentient flames on top of a grotesque pillar cry its many eyes out with tears not made of tears but smoke. It definitely isn’t pretty.

 

“....*sobs*..Yuri..”

 

“...bwahh….”

 

“Piss off kid i’m not in the mood”

 

“bwah , fuhwa”

 

“Leave me alone..”

 

“Pahh! pahh!”

 

“For fuck sake, What the fuck do you want- !?”

 

“Bwah!” 

 

Satan looked at the infant with a disbelieving face as he offered the carcass of his previous meal to the demon god. 

 

“Uhh…okay. First of all, I don't need to eat. Second, I don't eat peasant food. Especially not fucking leftovers” 

 

“Phaa! fuwah !”

 

The little shit keeps pushing the carcass with great determination but eventually gives up in front of Satan’s own determination to not consume a shitty meal. 

 

“Go play or terrorize other demons! Just leave me alone!”

 

Satan forced his eyes shut and ignored the little brat. He instead willed himself to relive the memories inside his head. The times when Yuri was by his side. He thinks of what could have been done if he just did something else -or at least a bit honest and told her what exactly in his mind- he was drowning himself in the lake of sorrow.

 

“Pahh!” 

 

“Oh- what now !?”

 

“Fuwah !”

 

Satan let out disgruntled noise when his wallowing is interrupted by the little menace. He heard the little shit left a while ago. Maybe he got bored or maybe he finally developed the survival instinct to stay away from the god of all demons. Clearly, Satan is hoping too much.

 

“You- i said i don’t want to eat! Are you deaf !?” 

 

“Fuwah! Pah!” The little tyke had the audacity to throw a freshly killed demon bird towards Satan and looked at him with a disappointed gaze. -the same one Yuri used to gave him whenever he’s being too ‘difficult’-

 

“I DON’T WANT IT!” He burned the entire corpse until there’s nothing left.

 

The little brat then went off again before coming back with another prey. Which then got  burned by the annoyed demon god.

 

This entire thing keeps happening for a whole month.

 

Satan has to hand it to the little menace. He has a strong determination and will -just like his mother-. He’s pretty sure that there are no more demons within 5 km in their vicinity. Due to being hunted by the little tyke. 

 

The whole trying to feed him irked him so much. But he felt too burned out to even get mad anymore. Even after a month has passed since his ‘breakdown ’, he can’t bring himself to do anything except grieve. 

 

After the 50th time, He didn’t even try to burn the prey that little menace offered him. He just left it there to rot. It smelled awful but he’s not the one with a nose now, is he. 

 

So now there’s a mountain of carcasses beside him. great.

 

“fuwah !” 

 

The familiar sound of a corpse being dragged and that annoying voice dragged Satan’s mood even lower. 

 

“.....where did you even find any of this ? if you don’t stop -or at least only hunt for yourself, the demon race will go extinct, you know ?”

 

Satan let out an exasperated sigh as the tyke devoured the freshly killed prey. He always ate so messy. -His teeth have grown but not hard enough to chew through bones.- The little bastard is so dirty from not taking any bath or grooming and from the mess after eating like a beast. 

 

“...you- ...tch- stop eating like that!” 

 

“Bwah !?” The little brat had the audacity to look annoyed. He’s clearly unhappy at being interrupted on his meal time.

 

“Ugh! Fuck it. Stop for a second, you little shit”

 

Satan had enough with the view of the little shit messy eating and the little shit dirtyself. he have to see every fucking day for a month. He wasn’t a stickler for hygiene or stuff like that. but even he know when enough is enough.  

 

He used his fire on the little tyke and burned all of the dirt, blood, and dirty stuff. 

 

Stupid little brat doesn’t seem to know how to burn it himself -although humanoid, his body literally all flames just like him!- or he just didn’t care. What do babies know about hygiene anyway ?

 

anyway. At least he’s clean now and not a walking hazard anymore -small mercy for Satan-

 

“There! You better keep yourself clean- and STOP!- stop eating like that!”

 

“Pahh!” 

 

Satan threw a concentrated ball of flames towards the little menace who tried to gobble the entire meat. It didn’t hurt him. It just pushed the little tyke back. 

 

“No !” Satan threw another ball when he the little brat got back up and tried to eat again with renewed determination

 

“fuwah!”

 

They keep doing the whole thing until the infant finally relents and just sits down in front of the meal. Satan guessed that the glare that he received was supposed to be menacing but all he sees is a pouting little brat -that face feels like it traced Yuri’s adorable pouting- 

 

“Are you ready to listen now, you little brat ? follow what i’m doing, then you can eat your meal. I have enough seeing you eat so disgustingly” 

 

“Fuwah!?” 

 

Satan then used his flames to break the meat into tiny little pieces. -Small enough to fit in a baby’s mouth- before throwing into his ‘mouth’ -he even made a show of ‘chewing’ the meat- he can’t taste anything except the feeling of something getting burned on his inside.

 

“See ? that’s not hard, is it ? now you do it like that too!”

 

“Pahh!”

 

Satan felt like facepalming when he almost got mad at the infant for not doing what he instructed and instead lunged at the meat like a beast. It took a while and a little bit of trial and error for the little brat to get it. 

 

lunging and face first into the meat, bad 

 

Immediately biting and chewed the whole meal, bad 

 

Break food to tiny pieces, good

 

Making sure none of the food slips out of his mouth, good.

 

Finally, the kid learned.

 

He won’t have to deal with a messy eater anymore!

 

A surge of pride came up as he watched the little menace eating less like a beast. pride for himself, of course. Not at the little tyke. Teaching a clueless idiot and watching them grow felt quite ... .nice.

 

Is this what Yuri felt when she taught him ? Did she feel this type of happiness when he followed her instructions correctly ? If so, then he’s glad. 

 

Satan made her happy. At that time at least. 

 

If he did the same thing to this tyke, Yuri’s child ... .will Satan become the little infant’s ‘ Yuri ’ ? 

 

Satan becoming this child’s everything

 

just like when Yuri is Satan’s everything

 

It’s the perfect revenge !

 

He loves Yuri but also hates her, he longed but also despise. 

 

He loves her, that’s why he will take care of their little spawn

 

He hates her, and that’s why he will grow him into his image rather than what she would hope. 

 

and for the first time in what felt like a long time, Satan let out a genuine laugh, 

 

“....hahaha….hey little brat- no i should give you a name first” 

 

“Bahh ?” 

 

“How about ‘Rinka’ ? That's a nice name isn’t it ? it was mine previously but you can have it. I don’t need it anymore” 

 

it would fit the little tyke more anyway. Not to mention the irony. Too bad he would be the only one who knows. 

 

Wait, no. there’s that bastard exorcist and that sketchy clown. They might have a clue if they heard of a demon called ‘Rinka’

 

“Pahh?”

 

“Right, right….from now on you will be under my care. Feel free to call me ‘father’, ‘papa’ or ‘daddy’  hahaha!”

 

And as his ‘father’, Satan is now obligated to protect him now. That means it would be best if no demons know about his little menace. Including Lucifer. 

 

Satan admits to being impulsive and too emotionally driven, but he’s not stupid.  

 

Betrayal is a common thing between demons. Of course they will obey him since he’s their god. But, If they know there’s a demon who can actually kill him, who’s also very vulnerable and malleable, they will take the chance to use his spawn to eliminate him. 

 

No self-respecting high level demon will be happy to be under someone’s thumb. And excluding him, Lucifer ranked first in the hierarchy. There’s definitely a big chance of him conspiring behind his back.

 

“Bwahh? “

 

“I’ll teach you everything that you need to know. So prepare yourself.”

 

Not only other demons but also humans too. 

 

It’s them against the world.

 

“fuwah ?”

 

Satan felt a sort of giddy excitement similar to when Yuri brought gifts and games. But also a strange nervousness and anxiety. His mind starts to make up questions like, ‘what if something went wrong?’, ‘what if i accidentally broke him ? children are more vulnerable, right ?’ etc.

 

Which is very weird. Because this is the first he ever felt that deep doubt on himself. Is this the so-called effect of parenthood ? Then he might need to peep from that bastard exorcist's eyes again. -He briefly saw a pile of new books on parenting and children last time.- After all, there’s no such thing as parenting books in literal hell.

 

“We will start with something simple and fit for your caliber-” 

 

“Gwah” 

 

“-when you eat, you first do this and say ‘let’s eat!’ .”

 

‘I mean, How hard can teaching a child from the start be ?’ 

 

After all, little Rinka inherited his flames. Why couldn’t he inherit Satan’s skill to absorb information really fast too ?

Notes:

who needs actual therapy when you have your kid to yell at, am i right ? ԅ(‾⌣‾ԅ) -Satan

Writing Satan is kind of fun since he had the same one track kind of mind like Rin.

Yuri is right when she said that satan is like a baby. A bratty kid with attitude and self importance with very destructive power.

She's great as a mother and a sister towards Satan. But she doesn't really have the upper hand to discipline the demon god.

Satan put Yuri in too much high pedestal and depends on her too much that he felt so betrayed when she rejected him. She can't force Satan to 'grow up' because of that 'expectation'

That Yuri will always accept and loves him unconditionally.

And considering the entire situation, I can't really put all blame on Satan.

Even without his vessels quickly dying, he's still a test subject in that fuck up facility.

Yes the scientist catered to his whims. But that's only because of his power. Which only reinforce his mindset of -the strong rules all-

All in all, Satan isn't really going to redeem himself in this fic

But just finally grow up.

It took one non-flammable baby demon who somewhat resemble Yuri, and a lot of yelling for him to finally let out what he's really feeling and actually process everything.

Baby demon!!Rin is mostly confused at what the giant flames is saying most of the time. But he like the flames warmth. So he keep giving it his leftovers like using woods as fuel for fire.

Anyway, thanks for coming to my Ted talk

*Demon!Rin will be named Rinka while human!Rin is just Rin