Demon Slayer AU

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This one is pretty self-explanatory.
So. Hawks is a demon slayer, and Dabi is a demon! They met on one of Hawk's missions; Dabi is part of the 12 kizuki (sorry, I spelt that wrong) and is 2nd top strongest. Hawks uses "Winged" breathing, meaning it has red wings and yellow, colourful, electro looking thingies. Also, there are fake cities in this fanfic! Dabi and Keigo loved each other when they were kids, but the Dabi got turned into a demon, and yeah.
Dabi can create blue fire from the floor, where his opponent is standing.

Hawks' POV

I was sitting against a tree, resting from my last mission. I always expect I'm going to die. Every single time that crow comes to yell, "MISSION MISSION." I had a small nap earlier until I was woken up by the Flame Hashira. Enji Todoroki. I was away when 4 little kids came. One is a demon herself. But she never ate human flesh or drank human blood. She was a little girl, about the age of 7, her name is Eri. The boy who claims to be her brother is Izuku, the 3rd who won't stop yelling and, for some reason, wears a grenade shaped wrist band, goes by the name Katsuki. And the 4th is a man who sleeps a lot. And when he sleeps, he's a better fighter? It's a bit weird, too, be honest, but he's Enji's son. Shoto.
The four have been going in missions with other Hashiras, like Aizawa and Enji. So now, the four said they'd like to join me one the next time I get that annoying bird squawking in my ear. There were rushes in the leaves from above tree I was sitting under, the fucking bird is back, I know it's only doing its job. But man it's annoying
Squawk! "Demon! Demon! In Yukina City! Demon! Demon! An Upper Moon Demon in Yukina City!" Squawk!
There it is, my peace and quiet ruined. I saw the kids standing in front of me.

"Hello Mr. Takami, uh, the master said we should go with you on your next mission." The green haired kid smiled at me, his wooden box on his back. The grenade kid next to him and the sleepy one catching up from inside. I nodded my head and stood up.
"Alright, let's go to Yukina City." I returned the small boys smile, and we headed off.
We rented a chart and horse Yakina City was about 5 days on foot. That's cut down to 2 days by horse.

The Demon we face is an Upper Moon, I don't know it's specific ranking, but I know it's killed thousands.

I don't think Katsuki likes the cart that much. The whole time he was yelling, "LET ME OUT, I'LL RUN AND GET THERE BEFORE YOU EXTRA'S!" It was very annoying. I think that kid spent too much time alone, he doesn't really know how to consider other people's feelings, but I mean, I'm not the best at it either so~

Now, while I was glad to be a teacher, towards 3 meddling kids and one demon, I'm not want you'd call 'qualified'. I can't even look after my nephew. He died because I couldn't save him and keep him in my line of sight! Some shitty uncle I was...

I'm over that now, I need to focus on the demon.

Time skip, bought to you by Inosuke pronouncing Tanjiro's name correctly

We arrived at Yukina city. Izuku saying it reeked of a powerful demon. Night had fallen, we got there pretty late. We rented a place and walked over to it. No luggage was with us so it was a quick walk. The kids were tired and went to sleep. I stayed up, looking at the sky. I always had trouble sleeping, so looking up at the stars and constellations made me feel nice. I loved the look of the night sky, so calming.

BOOM
BOOM
BOOM
BOOM

What the hell?! What was that?! 
I saw a figure jump from roof-top to roof-top. The demon! I jumped back as a handsome- I mean male figure crashed down from the sky, his fist where I was sitting.
A pale body, covered in purple scars. Black hair and face piercings keeping the flesh together. Beautiful ocean blue eyes snapped open as he smirked.

"Well, well, well. Looks like they sent me a pretty boy. Tell me, what's your name?" He was teasing me.
"I don't see how's that any of your business but, it's Keigo Takami, I know it's you Touya, so don't wear my name out." I snapped back at him.  He smiled at me, chuckling from my joke.
"I like you, now, I know your here to slay me but, I don't really feel like dying today."
"That's makes two of us."
He smiled. "Right now, I go by Dabi." His eyes lit up, literally, blue flames became visible for a few seconds. The kids came out from inside.
"DEMON!" No shit kid! That much is obvious.
"Correction, Upper moon 2, Dabi. Respect it please." He was cocky. "Hey, Keigo, your kinda cute, mind if we fight else where?" I looked up in confusion, he appeared in front of me and grabbed my waist. We appeared in the woods, demons crawling over after smelling a human. Blue flames erupted and formed a circle around me and the demon. My heated up, either from the fire or the abnormal attraction I'm feeling towards a DEMON! Why is that so? O should like this guy, he's a blood thirsty demon, eaten and killed thousands.
"Know what they say about you, Keigo. The fellow Hashira." He smiled down at me.
"Are you talking about they all hate me? It's kinda obvious. Way to rub it in!" I knew the others hated me, but I mean, I can be rude and don't give a damn about their feelings. I don't care if I die, I wouldn't mind.
"You want to die right?" He stoped smiling. I heard footsteps, the kids!
Claws ripped the fire apart, a girl with blue hair and bamboo in her mouth grabbed me from Dabi and took me back to the house. It all happened in the blink on an eye.

"MR. TAMAKI! ARE YOU OK?!" Izuku walked ran over to me. Crouched down, I knew I had a scared expression.
"I.. want to die." Wow, that was straight forward.
"Huh? You want to die..? Why?" He was concerned.
"I'm finished with the world. My time is up. I want to leave it." I looked up at him, he had a sad smiled on his face.
"Then, go." The others walked out.
"If it's what you want. Go." The grenade kid looked away, keeping the tears from falling. Same with Shoto. He smiled and reached out, helping me up. Dabi appeared just then.

"Can you kill me?" I was straightforward. He looked at me and smiled.
"Only if you take me with you." He grabbed my ass and we disappeared.
He showed me his neck once we re-appeared in the woods once more. I grabbed him and kissed him.
"I love you Dabi, have since we were 10." He smiled and kissed me again. I pulled away and pulled out my sword.
"Wing breathing, 6th form. Heavens wing!" I jumped and sliced of Touya's head, it's not going to hurt him, it will give him a peaceful resting.

He fell to the floor. Tears were flooding my face, hah. I took the blade to my chest, a pushed it into my heart. I fell down. My body falling down, with the remaining strength I have, I grabbed his hand. My eyes closed and I died. Finally. I can be free, with him....

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