Demon Slayer AU

By: FunahoMisaki

(A/N: I own nothing and it was just a little blurb that hit me so I had to write it. Maybe a bit OOC.)

"So what's his condition?" Muichiro asked looking worried as almost every pillar was gathered in the Butterfly Estate along with a few others, all for the same reason.

"Well as we all know he was brought here by his sister after he got into a fight with a demon that was attacking some nearby villagers after leaving his training with Himejima-san." Shinobu said and everyone nodded their head, they had gotten the crow message of Tanjiro intercepting a Demon attack on his own and having taken out the demon with ease but being rushed to medical immediately. They had all dashed here as soon as they got the message.

"He killed the demon with ease but it seems that the demons Blood Art activated once he was beheaded and Tanjiro-kun accidentally inhaled a bit of it. Tamayo-san and I managed to figure out exactly how the Art affected him but I'm afraid we don't know for sure how long the effects will last." Shinobu said calmly and there was a sound of pounding feet.

"Ah Tanjiro-kun! Please don't run around so much. We're not too sure how bad your head wound is!" Tamayo's voice came from the door behind Shinobu and all of the Pillars and other various Demon Slayers attention was laser focused on the door immediately.

"Okay Kaa-san!" A young voice said and the running feet stopped and there was silence for a few minutes.

"It's dark out now Tamayo-san. You can bring him out." Shinobu said after glancing out of the window and knocking lightly on the door.

"We're going to go meet some friends of yours Tanjiro-kun." Tamayo's voice was soft but close by as she approached the door with silent feet.

"Everyone please try not to crowd him or overwhelm him. If you make him cry then I can not promise that you will live long enough to apologize." Shinobu said with a smile on her face and miasma of darkness around her as she stared at them all while they shivered a bit under her stare.

"We're coming out now. Please keep your voices down." Tamayo said as she opened the door and stepped out into the moonlit hallway. She was beautiful usually but especially with the moonlight shining down on her and the soft smile on her lips as she stood before them with a small figure in her arms.

"Tanjiro-kun these are your friends." Tamayo said smiling gently at the boy on her hip as he looked at them with wide curious reddish brown eyes.

"Wow really?!" Tanjiro's eyes went even wider and the smile on his face was bright enough that it nearly disintegrated Tamayo and Yuichiro and damn near melted everyone else.

He was the size of an infant, roughly around three years old by Tamayo's guess, but he had all of his motor skills and could talk just as well as his adult self could and his smile was certainly bright enough still.

"Look at those adorable chubby cheeks!" Mitsuri was losing her god damn mind along with most of the other women nearby as they cooed over Tanjiro who was wrapped up in his far too big kimono and had his sword on Tamayo's waist.

"Huh. You're pretty tiny kid." Tengen, who despite being retired had helped with the training and been one of the first ones here when he got the crow, said stepping forward and looking at Tanjiro closely.

Tanjiro giggled and reached out, patting Tengen's cheek with one tiny chubby hand and Tengen's eyes went wide and there was a small blush on his cheeks. The others could literally see him melting in front of their eyes.

"Mine." Tengen said immediately as he plucked Tanjiro from Tamayo's arms with a small grin and turned towards his wives who were all cooing over the baby.

"Ladies we're adopting." Tengen said and his wives immediately cheered as they got as close as they could to coo over and greet the infant who giggled and waved his hands, happy to meet all three of them and let himself be fused over as he was held up easily in Tengen's good arm.

"Ara ara. I think you'll find that there's going to be quite a few obstacles to that Tengen-san." Shinobu's voice was dangerous and Tamayo was growling slightly as she glared darkly at Tengen, her slit pupils on display along with her fangs.

Nezuko got close to Tengen and stared curiously at her now little brother who smiled brightly at her.

"Nezuko!" Tanjiro remembered her immediately and waved his tiny arms at her and she immediately smiled and grabbed him, cuddling him.

"Onii-chan." Nezuko said cuddling her brother who happily nuzzled her back.

"So he remembers everyone too?" Giyu asked as he looked from his should have been successor to Shinobu who was glaring darkly at Tengen.

"It seems so but somethings are a bit muddled or perhaps he doesn't quite understand them. He called Tamayo-san 'kaa-san' as soon as he saw her." Shinobu said glancing at the demon doctor who smiled softly at Nezuko and Tanjiro, Nezuko approaching Tamayo and smiling up at her.

"Kaa-san!" Nezuko happily chirped and Tamayo clutched at her chest as she nearly fell out right then and there.

"But he also-"

"Kaa-san!" Tanjiro reached his tiny hands out towards Shinobu who immediately picked him up and cuddled him close.

"Called me that as well." Shinobu chuckled slightly with a small blush on her cheeks as she held Tanjiro who looked back at everyone curiously.

"Kanao-chan!" Tanjiro said his eyes lighting up and he waved his arms rather fiercely as he tried to wiggle free and get to her.

Kanao stepped forward and immediately took the infant into her arms and he wrapped his tiny arms around her neck and nuzzled into her.

"Kanao-chan pretty!" Tanjiro said smiling brightly and he kissed her cheek, Kanao's face flamed bright red immediately and she nearly dropped Tanjiro as she fell backwards in a dead faint. More than a few people were amused and alarmed at that as Shinobu caught her little sister and Giyu reacted quickly to catch Tanjiro.

"Tou-san!" Tanjiro beamed up at Giyu who's eyes went wide and he blushed brightly now as well.

"What about me Tanjrio-kun?" Muichiro asked stealing Tanjiro from the stunned and out of it Giyu.

"Mui-kun! Mui-kun pretty." Tanjiro said immediately nuzzling into Muichiro who blushed a bit but smiled as he nuzzled the top of Tanjiro's head.

"Aww look at his adorable chubby cheeks. I want a cute little baby like him." Mitsuri said and then her face flamed bright red as she realized what she had said while Obanai stared at her going bright red as well.

"Trust me they are cute but it's not so cute when you're having them." Amane, who had come to get a report on Tanjiro's status for her husband, said slightly amused while Muichiro had set Tanjiro down to see what he would do. He looked at the three other children there, Kiriya and his two younger sister Kanata and Kuina, and walked over to them with a big smile on his face.

"Pretty…" Tanjiro said looking at their hair and their wisteria hair decorations, making all three children blush.

"Please play!" Tanjiro said smiling brightly and hopefully at them and they all three glanced at their mother who nodded her head and Kuina brought out a small temari ball she had been using to entertain herself while they waited for information.

Tanjiro beamed at her and then quickly raced over to Genya and Himejima, tugging slightly on their pants.

"Play with us please!" Tanjiro requested with a bright smile on his face and Genya immediately collapsed onto the ground blushing while Himejima merely nodded and sat on the ground to play with the children, tears in his eyes.

"How come he didn't even look at us?" Zenitsu asked crying and Tanjiro glanced up at him and then pelted him in the face with the ball.

"Zenny no crying! Smile and play!" Tanjiro said and the others were snickering slightly while Zenitsu blushed at being called Zenny but gently threw the ball back to Tanjiro who beamed and tossed it to Kiriya.

"See even my minion when shrunk is more than a match for the blond one!" Inosuke said laughing loudly and making Tanjiro look up at him and laugh too.

"Sorry." Kanata said wincing when him looking away and laughing caused him to get hit in the head with the ball.

Instead of crying like most children did, Tanjiro just smiled and laughed a bit as he picked up the ball.

"Nice throw!" Tanjiro said smiling brightly at her even as he tossed the ball to Himejima.

Kanata blushed slightly and her mother smiled a bit, raising an eyebrow as she saw how her daughter was interacting with the currently three year old Slayer.

"He's so weird even as a brat." Yushiro said sweatdropping and Tamayo gave him a quick stern look but Tanjiro just looked up at him and beamed.

"Yushi! Come play!"

"Who the hell are you calling Yushi!?" Yushiro demanded sounding pissed and embarrassed with a bright red face, which wasn't helped when Nezuko began to pat his head again.

"So it seems that there is a Baby Pillar now." Amane said smiling softly as she saw how each of the pillars seemed to worry about and dote on the tiny Tanjiro.

She was already planning on having some of the uniform squad make him a tiny haori for while he was shrunken, she just had to figure out which design would suit him.