9 Works by Cyncosis
Listing Works
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You Look Quite Divine Tonight, Here Among These Vibrant Lights by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
05 Jan 2026
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Summary
The drawing of Kokushibo and Giyuu together was normal at first glance, before he noticed they seemed to be… a little too close. Both of them also seemed to be fairly disheveled, not to mention the…
…Oh.
OH!
_
Or, Kokushibo takes Giyuu back home after getting injured during their outing. Once he was done making sure Giyuu was comfortable, he goes to put a few things away, only to stumble across something a bit more than shocking. Perhaps even a little arousing.
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Summary
Before Runa could react, Marion placed the flower into her hair. A thorn cut into the side of her head, though she flaunted no reaction. She didn't bother to touch the warm blood rolling down her face, not daring to soil the gloves Marion had given her.
Marion eyed the trail of red.
Her smile only widened.
~
Or, a quaint collection of connected stories across a few days in my own universe with my own characters. This is set in the POV of Runa, the assistant of one of the villains, Marion Antoine. It stays merely professional at first, but as time goes on, things start to change gears and things get a little more... Romantic.
- Language:
- English
- Words:
- 11,107
- Chapters:
- 1/1
- Kudos:
- 7
- Hits:
- 40
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Make Me Behave Like an Animal by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
20 Aug 2025
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Summary
Giyuu takes it upon himself to deal with Kamado.
Nothing gets in the way of him and his husband.
No one would take away those closest to him.
Never again.
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I Send to You this Lover's Note, My Secret Hope, My Artichoke by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
16 Aug 2025
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Summary
He was baffled by the man's masked reaction. How could someone get so set off just seeing a pair of earrings?
Unless… he was a...
No. That couldn't be. He had a demon slayer mark. He had a sword. He was in Giyuu's estate. He was friends with Giyuu.
The smell got stronger.
_
Or, Tanjiro checks up on Giyuu, only to find him relaxing with another man. They talk, before Tanjiro's suspicions are raised against the other man, who Giyuu says is his friend. All hints lead to him being a demon, but how could that be possible? It was unthinkable!
Meanwhile, Giyuu and his "husband", Kokushibo, have a soft conversation with each other after Tanjiro leaves. Almost entirely oblivious to his inner turmoil. -
So Tell Them Anything, Dear, and Wrap Them 'Round Your Finger (Tell Them What They Want to Hear) by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
30 Apr 2025
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Summary
Gary and Karl sorta scenario, but Giyuu is now out to basically kill Tanjiro because he's got the earrings and will prolly be a sun breather. That means he is a threat to Kokushibo (aka his closest friend) and therefore must be purged. He is plotting on the roof and Shinobu decides to momentarily interrupt.
(Note: this happens before Giyuu would've had the chance to get closer to Tanjiro)
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Ashes to Ashes, Dust to Dust by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
21 Apr 2025
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Summary
College au where Michikatsu and Giyuu are dormmates and stressful exams are coming up. Giyuu was dragged to another hangout with the others (Aka the other hashiras) while Michikatsu stayed back and continued to study excessively. Giyuu gets sent back home, drunkenly realizes Michikatsu is still awake when it is almost 3 AM. Decides to convince him to sleep because this is a problem, it has happened before, and it is getting bad.
[Going to be rewritten/heavily edited soon] -
Giyuu, You Are My Liberty by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
25 Feb 2025
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Summary
Kokushibo decides to switch to a more human appearance, eventually being affected (effected? I hate this one.) by the weird looks he got from others. He starts to see himself as a dishonorable creature. He runs into Giyuu late at night in a random town.
After being made aware of the situation, Giyuu decides he does not like Kokushibos train of thought one bit.
(Slight Gary and Karl format, so they aren't sword fighting in the non fun way)
[Going to rewrite/heavily edited soon] -
Tidal Force by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
17 Feb 2025
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Summary
Giyuu, the god of the sea and the progenitor of envy, is invited to a ball being hosted by Shinobu after he "dissapeared" for a few thousand years. He has to prepare and realizes he may run into his lover, Kokushibo, the god of the moon and night. small time skip blah blah- Giyuu arrives at the ball and finds Kokushibo, reuniting with his lover. They leave the ball and spend time together in Kokushibos garden.
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Please, Just Rest Your Eyes For Me. by Cyncosis
Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)
10 Feb 2025
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Summary
A few months after Tsugikuni Michikatsu turned Tomioka Giyuu, formerly upper three back into a human. Giyuu wakes up in the middle of the night after a nightmare of his murders as a demon. He goes to talk to Michikatsu, who he lives with because he 1. was the one who turned him back. 2. he has nowhere else to go. But he finds Michikatsus room empty once again, and searches around for him. He finds Michikatsu on the roof of his estate, stargazing, and yet again neglecting his sleep for the 3rd day in a row. Giyuu decides to talk with him and hopefully get him to finally go the fuck to sleep.