How Did You Get Into My Garage?! (Muzan Kibutsuji X Teen! Reader)

You are Mischievous Humans. . .

You twirled around your house, playing the violin as Uncle Kaza and Tamio cooked, while the rest of your family helped themselves to the appetizers. Muzan was on the couch, answering questions as best as he could from the curious Aunt Dami and Uncle Taro. They were also watching you, and as you ended your violin solo, everyone clapped.

"You're getting better every time, Y/N!~ You told me over the phone you were participating in the talent show, right?" Uncle Douma called to you as you nodded cheerfully, being flustered by everyone's compliments. Once Tamio and Uncle Kaza were done cooking, everyone rejoined to the living room to talk while eating.

"So, Y/N said you were her babysitter. You look just like Michael Jackson!" Aunt Dami laughed and accidently snorted some of her food as Uncle Taro sighed.

"As long as your donating some of your money to the poor. . ." He muttered.

Muzan looked around, and noticed you or the small child that was with you were gone. He looked around, but didn't notice that you and Tamio were right behind him, sneaking up with a giant blanket. Both you and him threw it on top of him, and he thrashed around, thinking that the blanket was an attack from a Demon Slayer, before he got the blanket off, and saw that everyone was laughing at him, including you and Tamio, who were rolling on the floor, laughing your butts off. Muzan growled and threw the blanket to the floor. You stopped laughing when you heard sobbing coming from your bathroom.

"Wait, EVERYONE SHUT UP!" You yelled, causing everyone to quiet down. You put your finger up to your nose as you quietly walked over to the bathroom, and opened it quietly, only to reveal Riley in the corner of the bathroom, sobbing into his knees as you walked over to him and crouched down.

"What's wrong, Riley?" You quietly asked your cousin, and he brushed his gray hair out of the way of his face.

"W-will the loud N-noises come and G-g-get me?" Riley whimpered as you chuckled to yourself.

"No, they won't Riley. I promise." You murmured to him as he smiled, "Come on, let's get you something to eat." You grabbed his hand gently and led him to the already demolished kitchen as he picked out food to eat. By then, it was already night out, but still warm outside. When Riley was settled, you put away your violin as your family started to pick places to sleep for the night. You heard a 'Psst' as you turned around and saw Uncle Taro at the door of the house ushering you out with him. You nodded and got on your coat quickly, and ran over to him as you guys went outside, with Muzan noticing you heading out with him. He followed you outside as you looked behind Uncle Taro and saw him.

"He can come with us." Uncle Taro whispered to you as you as Muzan caught up to you guys.

Ahhhh, this must be what Y/N was talking about. They're going on a walk, like they said so.

As Muzan quietly followed the two through the neighborhood, both of them turned suddenly to an alleyway as Muzan followed them faster, now in front of them. Uncle Taro whispered something to Y/N as Muzan heard footsteps from behind them. He turned around, and saw about 3 adult men standing in the light.

"Woah, woah, not so fast there, people." One of them said as Uncle Taro and Y/N turned around and faced the strange and weird people. They walked towards the three people as one of them pulled out a knife and ran towards Uncle Taro, putting it up on his neck while getting behind him, causing Y/N to back away a bit, but Uncle Taro stood his ground as the other people tried to grab Muzan, but Muzan grabbed their hands and snapped both of them, and gave them the death glare not to scream, so the fell down in pain as the last one still had a knife to Uncle Taro's neck.

"What is a freak like you doing here? No one likes you. You'll never be useful." The person spat into Uncle Taro's mouth.

Uncle Taro scowled at him as he grabbed the person's neck and pulled them in front of him, before pulling out a rusty sickle and pointing it at the man's chin, threatening to stab it into the man's chin and up into his mouth as the man dropped his knife.

"You lay a finger on me, or my family. . . You pay the price." Uncle Taro rasped into the stranger's ear as he swiped the rusty sickled across the man's chest, causing him to fall to the ground, coughing up blood and blood spilling everywhere as Uncle Taro put away his sickle and ushered both Y/N and Muzan back to the house. Muzan turned back, and narrowed his eyes, before flinching to see Y/N leaning on him. As Y/N, Uncle Taro and Muzan went back into the house, Muzan looked back, only to see Uncle Koko looking at him on top of the neighbor's roof, staring at him. Muzan waved slowly and backed away into the house, with Koko still watching him.

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"Y/N. . .Y/N, you up~?" You heard Tamio's voice as you slowly woke up.

"H-huh. . .What do you want . ..?" You slowly muttered as he hoisted you up from your bed and onto your small balcony, avoiding stepping on Uncle Douma and Uncle Kaza, who had passed out on the floor. You both went outside and admired the stars as Tamio shared a bowl of popcorn with you.

"So, about the guy who's your babysitter. . .Is he a cosplay of Muzan?" Tamio asked you.

You sighed, and you finally knew what to tell him. "Well, Tamio, it's a long story, really."

---A long explanation later. . .

". . .And you guys got here!" You finished, as Tamio's mouth was wide open as he squealed.

"AHHH! IT'S A REAL MUZAN! I knew it! Once I saw him, I knew it the real one!" Tamio said, his blush covering his face as he buried it into his arms.

"BUT DON'T GET ANY WRONG IDEAS!" You snapped at him, causing him to giggle.

"Oh, I won't tell anyone~! I promise!" Tamio promised as you laughed, before a giant figure landed onto the balcony, causing both of you to scream, only to reveal Koko.

"You too should be. . . In bed." Koko murmured.

"Right, right! Uncle Koko, we were just going to bed!" You exclaimed as Uncle Koko looked you dead in the eyes, before hopping back up on the roof.

"God, he sometimes scares me." Tamio whispered, causing you to giggle as you and him went back into the house.