The Unknown Hashira (Demon Slayer x Reader)

[8: Things and Twins]

"Hey, boys!" Jera, the kakushi shouted. "You can rest for now! Have some snacks!" The girl said, the boys sighed and walked towards the shade. 

The three boys have been in this village for a couple of months now, they've been getting trained by the unknown hashira for that time. And honestly, the training that they're experiencing for the past weeks has been so tiring on their bodies. 

They're constantly pulling on boulders to make their arms stronger, running and jumping on obstacles created by the kakushi to make their legs more muscular, fighting the kakushis blindfolded to make their other senses stronger, and constantly performing all of their breathing forms to make a dance. 

Tanjiro sighed when he heard Zenitsu wail again for not having enough time to rest, the boy is right. The long hours of training need long hours of resting as well, but the hashira doesn't give them a lot of time. They can only rest when they need to eat, bathe, and sleep. That's it. 

Even so, Tanjiro looks at the bright side and always convinces his fellow swordsmen to thank Y/n for training them. It's quite rare for a hashira to train you and let you live in their home, right? That's what he always says to himself and his friends.

"Guys, are you ready?" Jera asked, clapping her hands and standing up. "Let's go and train your senses again, yeah?" The boys nodded and stood up, stretching their bodies to lessen the soreness of it. 

ʚɞ ʚɞ ʚɞ ʚɞ

"Oh my god!" Zenitsu screamed, sighing when his sore body submerged in the water. "Inosuke, don't do it!" He was too late, the said boy already jumped up and dived into the water, splashing everyone in the hot springs. 

The two boys started bickering again, while Tanjiro slowly submerged his body in. He sighed, letting his head roll back and look at the stars. He decided to close his eyes and remember all of the things that happened in this mansion/village over the past weeks. 

Since Tanjiro is an observant boy, he noticed a lot of things. And most of it is about their trainer, Y/n. 

The first thing that he noticed is that Y/n never eats like them. He will notice that the food they will give the hashira is different from what they're eating. He has a good sense of smell and he will smell that the food is always raw, not cooked! Yes, he knows that some food is better to eat raw, but they can't keep on eating raw food, right? 

The second thing he's noticed is that Y/n is always under shade. Every time that Y/n trains them they're always under something that will give them shade. Y/n will always have an umbrella or a hat with them while under a roof or a tree. Don't get him wrong, he knows that the sun is intense every morning, but there are times when the sun isn't that hot, but Y/n is still under the shade. He just thought that is pretty weird. 

He also noticed that ever since Y/n trained Nezuko, the girl seems to be more... lively. The girl seems to look forward to her training with Y/n. He also smells that Nezuko's scent seems to be more human... He doesn't know if he's just tripping or not, but something is happening when he's asleep. 

But the weirdest thing of all is that their trainer seems to always go somewhere, and every time someone asks them where they're going, they will always say that it's a "mission". He also noticed that every time Y/n came back from a "mission", they always smell the same. The same scent always lingers on their clothes, he thought nothing of it but it does bother him. 

One time though, he saw Y/n get back from a mission. And the thing that Y/n said to him is simply... terrifying. 

ʚɞ ʚɞ Flashback ʚɞ ʚɞ

Tanjiro went out of their room to train on his own, he wanted to train his Total Concentration to raise his physical and mental prowess. While concentrating on the roof, he smelled a familiar scent. He opened one of his eyes and saw Y/n, walking towards their mansion. 

He decided to go down on the roof so he can greet Y/n, running towards them. "Y/n-san! How was your mission?" He asked, all smiley and lively. 

But then that smile disappeared when he smelled the scent of anger and rage from Y/n, and it was the most intense scent he's ever smelled. It could rival Shinobu's anger at this point. He was pushed aside making him stumble on his feet, he looked up and the hashira was looking down on him. 

"Get out of my way, human!" Y/n said in a terrifying tone, their voice doesn't sound like the robotic voice he's so familiar with. The hashira left him standing there, baffled at what happened. 

ʚɞ ʚɞ End of Flashback ʚɞ ʚɞ

He was still shocked about what happened there, still so scared at the voice he heard from the hashira. He was scared at that time and he wasn't able to concentrate on his Total concentration breathing so he went back to sleep and tried to forget about what happened. 

To this day, he still doesn't know why Y/n called him a "human" like that. It's like Y/n is a different species talking to a human and belittling them. Even so, he didn't tell that to anyone since maybe Y/n was just in a bad mood and nothing else. 

"Tanjiro! Are you okay?!" He suddenly flinched a bit when he heard Zenitsu screaming in his ear. "Tanjiro, are you dead?! Tanjiro!!" Zenitsu screamed as he shake Tanjiro's body. 

"I'm okay, Zenitsu. You don't need to worry." Tanjiro assured his friend, while his friend is getting mad at him for scaring them like that. "Well, come on. Let's go to our room and get ready to sleep." 

"Also, we must get ready for tomorrow since we need to assist the Flame hashira for the Mugen Train," Tanjiro said to the others and they nodded, ready to fight demons, well Inosuke of course. "Come on, let's sleep." 

ʚɞ ʚɞ ʚɞ ʚɞ

The boys already left to go to their new mission and Y/n told them to be safe. They safely arrived at the Mugen Train, almost getting caught by the guards, but they were able to get in. Now they must look for the Flame Hashira to help him. They already heard a loud voice saying, "UMAI!" 

While the boys are on a mission, Y/n also has a mission. A "mission" of seeing somebody. "Mugen train, huh? Well, Rengoku is there so everything shall be fine." Y/n spoke to themselves, arriving at the place where they need to meet with this someone.

The place is dark and filled with huge thick trees, and mud all over the ground making it hard to stand. Y/n looked around and saw a bunch of red eyes looking at them, it seems like demons are everywhere too. 

Y/n sighed and sat down on a tree stump, waiting for the person they need to see. "That fucker has something up in his sleeve for him to meet me again," Y/n mumbled, holding their hat between their fingers, when they heard a loud rustle of leaves, they looked to the side and saw the person they were waiting for. 

A man with black curly hair, red eyes glaring at them, fangs being shown through a smirk. Y/n looked at him up and down and noticed that he was wearing a fancy suit, making them annoyed. 

"Greetings. How are you, my lovely twin?" The man said with a mocking tone, making Y/n stand up. 

Y/n slowly took off their mask, red eyes shining and glaring at the man. Their hair flowing in the breezy and heavy wind, their clothes swaying with the trees, their skin glistening under the moon, fangs being shown while growling at the man. And also tattoos all over their neck symbolizing... a collar? Y/n stopped growling and spoke... 

"What do you want from me, Muzan?" 

ʚɞ ʚɞ ʚɞ ʚɞ

👀👀👀

- Zeddxhi.