In an alternate universe where the tides of war favored darkness, the Demon Slayers have fallen, one by one, until only silence remains across the lands once guarded by Nichirin blades. The Demon King, Muzan Kibutsuji, now rules the world from the shadows with an iron grip, humanity reduced to whispers and obedience. With the Corps obliterated and no Hashira left to resist, peace- twisted and blood-soaked, settles over the night. But as the dust of battle fades and the demons celebrate their reign, a startling truth is quietly revealed, For over two centuries, The Demon King has been bound in secret matrimony to his most loyal and powerful subordinate, Kokushibo, Upper Moon One. Their marriage, hidden even from the other Upper Moons, was forged not only in mutual ambition and bloodlust but in a strange, unwavering devotion. Now, in the ruins of the old world, where no one is left to oppose them, the demon lord no longer needs to hide what he once buried in secrecy. Whispers begin to circulate in the demon ranks. ... A world where love exists even among monsters, power intertwines with passion, and the victors are free to unearth secrets once kept in the dark. --- Created: 26/05/25 Ended: ... Last updated: 28/05/25 Please feel free to give suggestions, requests, and opinions on this book. NON OF THE CHARACTERS BELONG TO ME- THEY ARE ALL FROM THE KIMETSU NO YAIBA MANGA BY Koyoharu Gotouge. THIS WORK SHALL NOT BE POSTED ANYWHERE ELSE WITHOUT THE AUTHORS PERMISSION. (I will not even be posting this story on AO3)

An alternative universe of Demon Slayer set in a high school! Muzan and Kokushibo are rivals due to academics; the two sabotage each other almost every day in their lives to cause any sort of disadvantage to one another. One day, Muzan decides to pull a prank, and it quickly turns into something deeper. Check "Explaining + Warnings 0" for more!

kokuzan, top Muzan, bottom kokushibo Muzan is an a++++ gaslighter

"This is completely idiotic...he's Kokushibo. His purpose is to serve me and to listen to my orders. My purpose is to give him orders and enforce them. Never should those two paths cross, never should I fall for my minions, never should my minions fall for me. Well, it's too late for that, huh..." ... Muzan Kibutsuji and Kokushibo (Tsugikuni) are business partners. For the past 1,000 years it has stayed that way. Muan gives out orders, and Kokushibo follows them like the puppy he is. They're supposed to be business partners; they're supposed to have that intimate relationship that other acquaintances do. But the two have never truly had a real conversation. And while Muzan figured it was just him scaring the living hell out of Kokushibo, the upper moon had significantly different thoughts running through his mind. Every time he tries to converse with his master, Kokushibo is faced with an intensive feeling that acts as almost a force field that prevents him from talking with Muzan. His palms get sweaty, his knees weak, his throat dry, and his heart starts going a kilometer a minute at the mere sight of his boss. What is this feeling? Could it just be the severity of Muzan's presence, or is there perhaps something more emotional going on that is causing this boundary... This is not a slow-burn!! It doesn't take long for much to happen. I know that's boring but i'd say its pretty worth it? Warning!!!: this story also has Akaza x Douma and Gyokko x Gyutaro. Why? I completely ship Akaza and Douma as well and I needed something for the support characters to do. What about Gyutaro and Gyokko? That's not a ship that I personally support, but again; it's EXTREMELY minor and is just a side story for the sake of it (I needed a break from Kokuzan for a bit and that's where my mind was) Angst, fluff, smut, everything you'd want in a BL--a demon BL, at that. :)

A lone Michikatsu just went through a nasty divorce with his ex-wife, Haruhime. One day, Michikatsu was out drinking until he met Muzan. They instantly clicked off and became friends. Little to Michikatsu's knowledge, Muzan was a vampire.

𝓉𝑜𝓅: 𝓀𝑜𝓀𝓊𝓈𝒽𝒾𝒷𝑜 ✮⋆˙ 𝒷𝑜𝓉𝓉𝑜𝓂: 𝓂𝓊𝓏𝒶𝓃 ₊˚⊹♡ 𝒜/𝒰: 𝓂𝑜𝒹𝑒𝓇𝓃 ༘⋆ 𝓂𝓊𝓏𝒶𝓃: 𝒿𝓊𝓈𝓉 𝒶 𝓁𝑜𝓃𝑒𝓁𝓎 𝓈𝒸𝒽𝑜𝑜𝓁 𝒷𝑜𝓎 𝓌𝒽𝑜 𝒽𝒶𝓈 𝒶 𝓂𝒶𝓈𝓈𝒾𝓋𝑒 𝒸𝓇𝓊𝓈𝒽 𝑜𝓃 𝓉𝒽𝑒 𝓇𝓊𝓂𝑜𝓇𝑒𝒹 "𝓅𝓁𝒶𝓎𝒷𝑜𝓎 𝑜𝒻 𝓉𝒽𝑒 𝓈𝒸𝒽𝑜𝑜𝓁".. 𝒶𝓀𝒶 𝓉𝒽𝑒 𝓂𝑜𝓈𝓉 𝓅𝑜𝓅𝓊𝓁𝒶𝓇 𝒷𝑜𝓎 𝓉𝒽𝑒𝓇𝑒, 𝓀𝑜𝓀𝓊𝓈𝒽𝒾𝒷𝑜. ⋆˚✿˖° 𝓀𝑜𝓀𝓊𝓈𝒽𝒾𝒷𝑜: 𝒿𝓊𝓈𝓉 𝒶 𝓅𝑜𝓅𝓊𝓁𝒶𝓇 𝑒𝓂𝓅𝒶𝓉𝒽𝑒𝓉𝒾𝒸 𝓈𝒸𝒽𝑜𝑜𝓁𝒷𝑜𝓎 𝓌𝒽𝑜'𝓈 𝒻𝓇𝒾𝑒𝓃𝒹𝓈 𝓌𝒾𝓉𝒽 𝒶 𝓌𝒽𝑜𝓁𝑒 𝒷𝓊𝓃𝒸𝒽 𝑜𝒻 𝒷𝒾𝓉𝒸𝒽𝓎 𝓈𝒸𝒽𝑜𝑜𝓁 𝒻𝓇𝒾𝑒𝓃𝒹𝓈. ⋆ ˚｡⋆୨୧˚ 𝓂𝓊𝓏𝒶𝓃𝓈 𝒷𝑒𝑒𝓃 𝒶𝒹𝓂𝒾𝓇𝒾𝓃𝑔 𝓀𝑜𝓀𝓊𝓈𝒽𝒾𝒷𝑜 𝓈𝒾𝓃𝒸𝑒 𝓉𝒽𝑒𝓎 𝓌𝑒𝓇𝑒 𝓈𝓂𝒶𝓁𝓁, 𝒷𝓊𝓉 𝒽𝒶𝓈 𝓃𝑒𝓋𝑒𝓇 𝒷𝓊𝒾𝓁𝓉 𝓊𝓅 𝓉𝒽𝑒 𝒸𝑜𝓊𝓇𝒶𝑔𝑒 𝓉𝑜 𝓈𝓅𝑒𝒶𝓀 𝓉𝑜 𝒽𝒾𝓂, 𝓁𝑒𝓉 𝒶𝓁𝑜𝓃𝑒 𝒸𝑜𝓃𝒻𝑒𝓈𝓈 𝓉𝑜 𝒽𝒾𝓂, 𝒹𝓊𝑒 𝓉𝑜 𝓈𝑜𝓂𝑒 𝒾𝓃𝓉𝑒𝓃𝓈𝑒 𝓈𝑒𝒸𝓇𝑒𝓉𝓈 𝓉𝒽𝒶𝓉 𝒽𝑒𝓈 𝓃𝑒𝓋𝑒𝓇 𝓈𝒽𝒶𝓇𝑒𝒹 𝓌𝒾𝓉𝒽 𝒶𝓃𝓎𝑜𝓃𝑒 𝒷𝑒𝒻𝑜𝓇𝑒, 𝒷𝓊𝓉 𝓉𝒽𝒶𝓉 𝒶𝓁𝓁 𝒸𝒽𝒶𝓃𝑔𝑒𝓈 𝑜𝓃𝑒 𝒹𝒶𝓎.. જ⁀➴ *ੈ✩‧₊༺☆༻*ੈ✩‧₊ 𝒯𝒲'𝓈: - 𝓂𝑒𝓃𝓉𝒾𝑜𝓃𝒾𝓃𝑔 𝑜𝒻 𝓈𝑒𝓁𝒻 𝒽𝒶𝓇𝓂 ๋࣭ ⭑ - 𝓅𝑜𝓈𝓈𝒾

A story between two students of Ravenswood University.When a senior year science student , Kokushibo Tsugikuni,falls for the new transfer freshmen year, Muzan Kibutsuji,the story starts of they're life all together...

Set in medieval times, The Whipping Boy tells the story of how a spoiled prince and his cunning whipping boy escape kidnappers and become allies.

The story of Kokushibo/ Michikatsu and Muzan Kibutsuji. ⚠️WARNING MY AU⚠️

Hi i'm new to writing and this story will be mostly about human au and High school au of the two of them. You can request anything except smut or detailed gore #254 on Muzan #669 on Kokushibo #92 on Michikatsu #39 on kokushiboxmuzan #19 on muzanxkokushibo