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Permanence: The (Un)Official Art Book by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
29 Mar 2026
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Summary
All of the artwork I’ve created for Permanence: Shukemi No Sedai — my original character-based project — put together in one deposit.
Series
- Part 2 of Permanence: Shukemi No Sedai
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Permanence by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime)
13 Mar 2026
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Summary
A collection of self-indulgent writings centering the ruthless demon progenitor, Muzan Kibutsuji, and a young, red-haired human named Dimitri Grey.
(Sensitive topics sometimes featured, content warnings are given in each chapter summary.)
Series
- Part 1 of Permanence: Shukemi No Sedai
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Worst Case Scenario by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
15 Feb 2026
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Summary
Yoriichi’s soft maroon eyes widened as he very slowly straightened up after picking up the item Michikatsu had thrown, recognition making the hairs on the back of his neck rise up as he realized what he was holding. Michikatsu continued to curse and panic behind him, but Yoriichi ignored him, carefully turning over the capped item before his lips parted in raw shock upon seeing exactly what so many men in the world dreaded like the plague.
Series
- Part 11 of Yin and Yang (Tsugikuni Brothers)
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The Scarlet Records by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
06 Feb 2026
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Summary
Inspired by the official records books, this is an information-filled work intended to expand what I’ve created for my original character-focused story and world known as Permanence: Shukemi No Sedai.
Series
- Part 3 of Permanence: Shukemi No Sedai
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Whispers by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
16 Jan 2026
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Summary
A collection full of small drabbles and/or artworks that center the Tsugikuni twins, for the things that aren’t long enough for their own work, but that I’d still like to post or save. Something of a waste basket, so to speak. Dead Dove: Do Not Eat.
(Sensitive topics sometimes featured, content warnings are given in each chapter summary.)
Series
- Part 7 of Yin and Yang (Tsugikuni Brothers)
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Under the Influence by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
11 Jan 2026
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Summary
Yoriichi was staring at his brother a little too hard, a little too closely. The alcohol was making him dreamy and sappy, but it was also making him feel drawn to his twin in a way that was far more pronounced than normal. A heat was pooling low in his gut, winding tightly like a snare around an animal’s foot.
He wanted to fuck Michikatsu so badly, so fucking badly — but he still had just enough of his inhibitions left to know that this was a terrible idea for both of them.
Series
- Part 12 of Yin and Yang (Tsugikuni Brothers)
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Curiously Morbid by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
24 Dec 2025
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Summary
Muzan stood eerily still, feeling like a prey animal under the gaze of a predator; a deer caught in headlights. He stared at the stranger’s back, studying the tall man’s muscular silhouette, trying to make sense of anything that was happening around him. He had never seen the red-haired man before, yet the stranger seemed intimately familiar with him.
“…Who are you?” he finally asked in a low voice, tentative, risking it just for a chance to comprehend his predicament.
Series
- Part 4 of Permanence: Shukemi No Sedai
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The Hanafuda Earrings by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
31 Oct 2025
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Summary
A deep chill fell over the prisoner’s body and his eyes widened, the man’s muscles locking up as he momentarily forgot how to breathe at the very sight of those earrings.
They invoked a visceral, fearful reaction from deep within his chest, his entire body freezing up as he simply watched the earrings gently sway, a sudden memory emerging in his mind as he stared.
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Incompetence by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
26 Oct 2025
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Summary
However, compared to that, Muzan seemed bored now, almost disinterested. His striking carmine eyes were glued to the pages of the book he had brought over — why did the progenitor even need literature while another man’s cock was inside of him? Was Akaza performing so poorly that Muzan needed a distraction to keep himself entertained during their copulation?
Series
- Part 2 of Of The Flesh (Demon Oneshots)
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Fatal Flaw by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
27 Sep 2025
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Summary
He’d long memorized her beautiful voice and unique song, and so he started to gently rehearse the song from memory, his smooth and androgynous voice blending with Kotoha’s song almost flawlessly. The little boy slowly paused, his face shifting into one of pure innocent wonder as the bloodied demon sang to him gently.
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Gluttony by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
24 Sep 2025
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Summary
Tamayo had warned Michikatsu that something like this could happen if Yoriichi completely starved himself — however, it had gone on so long that Michikatsu had started to wonder if his brother truly was special as always, maybe he didn’t need to eat humans to survive. He could walk in the sun, couldn’t he? His body and his abilities had been blessed in every other possible way, perhaps human flesh was not a requirement for this man?
Evidently, Michikatsu had been wrong.
Series
- Part 10 of Yin and Yang (Tsugikuni Brothers)
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Business Matter by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
28 Aug 2025
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Summary
To Douma, if he had any purpose outside of saving the pathetic humans who groveled at his own feet, it was to serve Muzan’s every whim.
“Stop being so sentimental,” the demon king muttered as he began to unbutton his dress shirt with one hand, the black tie undone and his silk vest hanging open. “It’s absolutely sickening.”
Series
- Part 1 of Of The Flesh (Demon Oneshots)
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Oh My God, They Were Roomates by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
12 Aug 2025
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Summary
Muzan knew about it all, too. And, given the odd, competitive rivalry that had existed between him and Yoriichi since all three of them were kids, and the fact that Muzan and his brother were exes… some part of Michikatsu wondered if Muzan only fucked him as a way to get back at Yoriichi. He wondered if Muzan wanted them to get caught.
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Lewd and Lascivious by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
09 Jul 2025
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Summary
Then, Yoriichi felt a hand land on his head, before there was a slightly painful pressure upon his scalp as Michikatsu’s slender fingers seized the base of Yoriichi’s ponytail, fisting all that thick, dark hair tightly and eliciting a low grunt of pain from Yoriichi. The younger’s breath hitched at this, another flush rising upon his face, before a soft moan was pulled from his lips as Michikatsu tugged his ponytail and forced him to look upwards again.
“…You like this,” Michikatsu noted aloud as he gazed at Yoriichi’s flustered face, pulling on his hair a little tighter and watching tiny tears spring up in the corners of his younger brother’s pretty eyes. “…Don’t you?”
Series
- Part 9 of Yin and Yang (Tsugikuni Brothers)
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Sloppy by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
20 Mar 2025
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Summary
“What are you…” Yoriichi swallowed thickly as he trailed off, his eyelashes fluttering as his hips twitched upwards subtly despite the flushed fatigue on his face — Michikatsu knew his twin had to be tired after coming before, and he also knew the other man would be significantly more sensitive now, even more alert and reactive to every one of Michikatsu’s mischievous ministrations, thanks to the shattering climax he had been brought to minutes before.
Series
- Part 8 of Yin and Yang (Tsugikuni Brothers)
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Night Shift by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
29 Aug 2024
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Summary
Michikatsu dipped his deft, slender fingers behind the belt instead of toying with the edge, tugging a little more firmly as he lifted his head, still pouting. He met Yoriichi’s gaze and pulled again, hard enough to easily guide their hips flush, making the younger twin grunt as he swallowed heavily.
“Love me before you go…?” Michikatsu asked softly, a pleading and sad look in his eyes as he continued to make that sulky, puppy dog-esque face at his brother, and the younger already knew he was done for; he spoiled Michikatsu far too much to say no.
Series
- Part 6 of Yin and Yang (Tsugikuni Brothers)
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Starvation by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
17 Jun 2024
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Summary
Tenjiri leaned forward to growl in the man’s ear, resisting the gripping urge to bite Yoriichi’s throbbing carotid artery as his strong demonic arms caged Yoriichi in on either side of his strong, muscular torso. His fevered charcoal eyes could see that Yoriichi’s nails were scrabbling at the floor, leaving small splintering trails in their wake as the sun breather searched almost desperately for purchase. The poor thing.
Series
- Part 4 of The Sun, The Moon, and the Sky
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Frater Meus by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
04 Jun 2024
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Summary
Michikatsu felt a sickening excitement that was even more potent than the alcohol coursing through his system. The overwhelmed and horribly drunk man took a rather unsteady step closer to his twin until their chests brushed together, feeling this unnameable, gripping urge to be closer to him — as close as was physically possible, until there were no lines separating them, until the edges that kept them so vastly apart from each other blurred, until Yoriichi was his and he was Yoriichi’s. Until they all but melted together as one, and no one could ever claim anything different.
Series
- Part 1 of Yin and Yang (Tsugikuni Brothers)
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Obedience by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
21 May 2024
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Summary
“Aniue,” Yoriichi called out softly, his face flustered and his brows cinched up with something like a pleading expression, in awe of the sight of his twin like this and wanting so much more than what he was being allowed to have.
“Shut up,” Michikatsu hissed back, one hand moving to suddenly grab onto Yoriichi’s jaw, forcing the younger man to look up at him. “Who told you speaking was allowed?”
Series
- Part 2 of Yin and Yang (Tsugikuni Brothers)
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Pondering by kingdimitrx
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
05 May 2024
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Summary
"Mhmm..." Michikatsu nods almost shamefully, hips rocking slowly of their own accord in order to match the casual rhythm of Yoriichi's fingers. "You should... Hah, become, uh... Become a demon."
Of all the things Yoriichi had been expecting his cockdrunk older brother to say, that certainly wasn't one of them.
Series
- Part 5 of Yin and Yang (Tsugikuni Brothers)