1. After a lower demon presented photos of all the hashiras to Muzan, Doma found them and decided to call thier master and the other Upper Moons together to play smash or pass.
It goes pretty well, but when Doma realized they had all voted Smash on the water hashira, he proposed a challenge. Whoever could seduce him would be the winner.
After convincing everyone to agree, he then found Giyuu and told him about the challenge. Why? Cause he thought it would be hilarious.
Shinobu just wants to know why Tomioka is suddenly hoarding wisteria incense like his life depended on it.
2. Kokushibo enrages a witch, which didn't even know was a real thing up until that point, and she casts a curse on him turning him into a cat.
He's still a demon, sure but now he's stuck in the form of a little feline and can't sense his lord or call for help.
Fortunately, a young man finds him and takes him in.
Unfortunately, that young man is the water hashira and can sense a strange amount of demonic energy around this cat.
Aka Kokugiyuu where Kokushibo falls in love with Giyuu
3. Reincarnation au where Giyuu was Michikatsus secret gay lover in a past life, but between the period typical homophomia, the expectations to produce a family heir, and his desires to become a samurai, he decided to break up with his boyfriend.
It was years later when he was patrolling as a demon slayer that he had found his former lovers' body half devoured by a demon. He blamed himself for not being there for him, and it was one of his life's greatest regrets.
So when he's battling in the infinity castle against all those hashiras, he wasn't expecting to see his former lover there reincarnated but in bad shape.
His heart ached, and suddenly, nothing else seemed to matter. Not the hashira, not their emerging marks, not even his decendant pinned to a wall by his own sword. He needed to escape with this Giyuu and have his lord turn him into a demon. He needed his lover to stay with him forever.
He ignored the others cries as he batted to broken sword out of his lovers hands and ran away with him over his shoulder.
He will not lose him again.
It was as he was running that he noticed the walls of the infinity castle weren't changing. Not only that, the infinity castle hadn't regenerated at all when he was fighting with those other warriors. Something was clearly wrong and he felt foolish for not noticing it earlier.
He rushed to where he knew Nakime would be and managed to save her from some unknown demon. Once she was freed, he didn't hesitate to order the removal of all humans from the infinity castle, save for the one still squirming on his shoulder.
Aka the infinity caste ark ends very differently. The war wages on with tanjiro and co becoming hashiras and Muzan surviving and trying to rebuild. Many of the hashiras didn't die to Muzan thanks to Kokushibo preventing the fight in the first place.
This can go so many ways. Horror/angst from Giyuus perspective? Sure. Cute fluff as kokushibo tries to woe his former beloved all over again while getting caught in flashbacks? Absolutely. Crack fic where yandere kokushibo is trying to spoil Giyuu rotten while the water pillar tries in vain to escape their embrace? Lol.
4. Time travel au where Giyuu is sent back after he dies from his mark at 25. He wakes up to Sabito telling him breakfast was ready.
Unsure if the life he lived was real or just a dream, he tells his Sensei about his dream, including details about Kanzaburo, the upper moons, the infinity castle, Muzan, ect. Until Urokodaki asked for him to pause and came back with some soft wax and paper, asking him to draw some of the people he remembered.
Little did he know those drawings were going to be sent directly to the Ubuyashiki family, and it would turn his and Sabutos lives upside down.
At least he can show Sabito all the cool moves he learned with the extra decade or so he had been alive.
5. Just in Time au where Giyuu makes it to the Kamado family home just in time to face Muzan... and get his butt kicked pretty hard. He put up a decent fight but ended up with more of Muzans blood in his body than his own.
The demon king leaves, not expecting Giyuu to survive and seeing no point to try and turn a bunch of weaklings when back up could be coming. The kamado family care for the man who saved thier lives as he is unconscious and turning.
Fearing what the demon king said about Gyuu not being able to stop himself from eating the family If he survived, Kie Kamado remembered a stash of ancient sorcery/forbidden medicine books that were passed down through uer family and found the section about making talismans to control, banish and subdue evil spirits. Using the dried heads of the blue spider lillies she kept for medical reasons, she crafted a set and slapped one for control onto the demon slayer chest.
Tomioka screamed like he had been struck by lightning but otherwise went right back into a fistful rest. When he next awoke-wild and ravenous, he was immediately held down while the mother poored a glass of her own blood down his throat while some of the her kids preformed some sort of ritual.
After that his mind returned to him and he was the "Gaurdian spirit of the family". Naturally he can't return to the demon slayer core as a demon, nor will he just sit back as demons continue to kill innocent people.
The kamado family, feeling they owe a life debt to him, join him on a journey to find a cure for his affliction. They do everything in thier power to help Giyuu, including wearing his hiori and telling the tale of how a demon slayer fought the demon king himself and saving thier family, but losing his life in the process to anyone who seems to recognize it.
Did I mention that Giyuu is training everyone? Even the 3 year old gets age appropriate breathing lessons to strengthen his lungs. It's all fun and games until the sweet, gentle looking lady and her toddler dislocates your jaw.
And of course, they need to arm themselves with nichirin blades, so they just steal them from slayers that Giyuu rescues from demons. You would think this would earn the ire of the sword smiths, but they instead feel flattered that they like them so much.
Thankfully between the daily cup of blood Kie has to give him every day as part of thier spirit contract and the fact he keeps eating other demons, Giyuu rarely goes hungry but he lives in fear that he might run across an upper rank demon that would be both smart enough and strong enough to attack the talisman on his chest or kill Kie to place him back under Muzans control.
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