(3rd Person POV)
Suddenly deep within a castle a door appeared within one of the many sprawling rooms.
One person who was made as the caretaker of the castle paused when playing her Biwa as she noticed the door that wasn't connected to her or her ability.
Currently the Infinity castle was empty as all of the other demons, Upper Demon Moons and even her master were currently out doing their own things leaving her alone.
But she prefers it that way as Nakime was one of the few Demons that don't eat humans, not because she won't do so but because she gains sustenance from her masters blood making it so she doesn't need to go out and hunt while keeping the Infinity castle stable at all times.
So seeing this she strummed her Biwa as the castle morphed to her command before she appeared before this mysterious door that was standing in the middle of an empty room.
It unleashed light from it which she believed was sunlight, but when she tentatively extended her hand, the light didn't harm her, not knowing what exactly to do in this situation she decided it was best for her to confirm what was beyond this door, and so she stepped on through.
When she got to the other side she found herself within what appeared to be a shop where she saw a man sitting behind the counter looking at a small device in his hands.
Noticing her arrival he looked up and smiled at her, "Welcome to my shop Nakime where you can buy everything for the right price." He said to her.
(Orion POV)
"Who are you? And how do you know of me? You don't smell like a human nor do you smell like a demon either." She said cautiously looking me over.
"Who am I? Well you may call me Orion and I am just your humble merchant peddling his wares to anyone who comes to my shop, as for how I know of you well for one who exists outside of your world I know its history, I know of Muzan Kibutsugi, I know about all the Demon Moons and even…." I say as I flourished my hand before her as a Boquet of Blue Spider Lillies appeared in my hands.
"I also know what your master most deeply desires." I say to her as I see her eyes widen behind her long hair seeing those Blue Spider Lillies.
Though I snap my fingers and they disappeared entirely, not even the smell remained as if they never existed at all.
"So please, run back and tell your master the good news, tell him you found the Blue Spider Lillies he always wanted." I say to her which she rapidly nodded before departing from the store quickly to tell her master of what she discovered.
"I doubt it will take more than a few minutes for him to arrive here." I say to myself while twirling the Blue Spide Lily in my hand.
"Luckily this form of Immortality has a massive caveat to it." I say as I look over the panel for it in my shop.
[Demon Slayer Elixir of Immortality: When created perfectly makes one become Immortal, but if one ingredient is missing will cause the consumer to become a demon, this will allow the demon to create other demons, but when the final piece of the elixir is consumed the user loses all the powers as a demon and becomes immortal instead, all demons created when one was the first demon will be killed off as a result.]
I put the panel away as I heard rapid footsteps before a man wearing a suit and white fedora walked on through the door.
But not only him but Nakime and Kokushibo also came in as well, possibly as an insurance in case anything happened.
Though the second Muzan saw the Blue Spider Lily all the muscles in his body tensed up as he was about to leap forward to snatch the thing he so desired from my hands.
But suddenly him, Kokushibo and Nakime felt a massive force slam into their bodies that was so immense that they were all forced to their knees with Nakime forcibly made to Prostrate on the ground.
*Tsk Tsk Tsk* I clicked my tongue at the sight of what I was seeing before me, "I wouldn't do that if I were you, after all it is forbidden to attack the shop or anyone working in this shop, so unless you want to experience the feeling of being crushed like a bug I'd suggest you think twice before trying to attack me." I say while blood was pouring out of their eyes, nose, ears and mouth from the crushing weight placed on them.
Seeing that the more he tried to fight it the more heavy the pressure became, so he calmed his heart and became still and to which the pressure lifted allowing them to regain their ability to stand up.
Muzan gritted his teeth in anger, but held back at lashing out as the blood on his face seeped back into his body and making it once more appear as if nothing ever happened.
Same could be said for Kokushibo but Nakime wasn't as lucky and needed more time to recover from the pain.
With that said Muzan approached me before taking a seat on the stool in front of me as we stared at each other eye to eye.
"You call yourself a Merchant right? What is it going to cost to get what I want." He says to me as I smile hearing that.
"Oh it's nothing much, all I ask of you is to give me your full Dominon or Demons and I shall give you the Immortality you so desire." I say to him with a smile.
*SLAM!* "Is this some kind of joke?! Do you think I would willingly give up my authority for that?!" He shouted at me but my smile didn't falter for a second.
"Of course you would, after all once you completely become an Immortal you lose your authority over demons anyway, not only that your entire army of underlings dies as a result of you gaining what you have desired for over 1000 years." I say to him which surprises him to hear.
"Becoming a Demon was a mistake that the medicine you were supposed to take to heal you, the perfected version fixes that problem entirely." I say making him ponder my words.
"Come now, do you really care about being a demon more than being immortal and never needing to fear the sun ever again? It's all you ever wanted and I'm here to make the deal for you, all I ask is that I gain your authority over all your demons in return, it's quite a simple deal and with it you will be able to travel the world and see the sights you could never see as you are now." I say painting him a picture of his future.
Hearing this it didn't take him long to get over his misgivings on this, his chance at being a true immortal was right before him and none of his Demons mattered to him, they were all tools in his eyes and now they have served their purpose so giving them up for what he deserves was a small price to pay in his book.
"Fine, take my Authority and giving me my immortality!" He said to me which I just grinned.
With a snap of my fingers a blackish red pulsing light left Muzan's chest causing him to be able to barely hold himself up as his body went weak and frail before said light entered my chest.
I smiled as with this I had gained myself some believers that would soon enough grant me faith at that, so to finish the transaction I pulled out a bottle filled with a blue liquid and placed it before him.
"Here, the finished version of your potion of immortality, I do this as with how weak you have become you probably wouldn't make it to your lab to make it yourself with all the ingredients you have gathered to make it in the first place." I say to him.
Hearing this and seeing the thing he always wanted before him he snatched it up and drank it whole heartedly until everything was drunk down to the last drop.
Soon enough his body began to regain his strength once more as his eyes went from their blood red color to a more neutral brown color.
"Well congratulations Muzan, you have done it, you have truly become immortal, now you will never have to worry about being sick or weak ever again." I say to him as he looks at his hands as he felt fine now but sensed a great loss of power he once had.
But realizing the lost of all his demon powers in exchange for immortality like I had told him, in his mind was worth it so he stood up and looked at me.
"Thank you merchant for this, but may we never cross paths again." He says before looking at Kokushibo and Nakime.
"He's your master now, follow his commands like they were law." Is all Muzan said as he went towards the door.
'Set destination of the Door nearby a Blackhole in the Invincible Universe.' I mentally tell the shop to do that which is does with no perceivable difference in its looks.
Muzan steps through the door without a second thought before being placed right next to a black hole all while I return the door to where it was in the Infinity Castle.
"Hehehehe…. That's why you don't make a deal with the devil." I mutter to myself before I stand up and look at my new followers.
"Come along then, let's return to the Infinity castle and gather all the Upper Moons together, I want to meet my new subordinates." I say to the two of them before heading towards the door and exiting the shop.
Time to decide who will be my next followers and who won't as I don't need an army of demons at my disposal.
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