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

Ground Rules. . . I doubt you can follow them.

"I still don't get how you could just drive a car to the school instead of walking. NOW WE HAVE TO WALK TWO MILES TO MY HOME!" You grumbled to the demon lord as you and him walked alongside a sidewalk entering your neighborhood, the trees shadowing you two as the sun barely showed in the distance. Daylight savings made it much easier for Muzan to come to your school, but the sun had to show up sometime.

"What's a car?" Muzan asked.

You palm faced yourself before groaning, and you looked up and saw police cars drive past you and him as you stopped walking.

"Huh. . .That's weird. I've seen 5 police cars now in my neighborhood." You mumbled. You shook it off and thought that maybe one of your drunk neighbors just called 911 or something by accident. As you got to your house, you could see police cars parked beside your house as you picked up your speed and hid behind a tree, and peeked to see where all of the commotion was coming from.

"Did you see where they went, Miss?"

"N-no, for a second, I was just enjoying my coffee by my window and saw the teenagers walk by, and then I looked back f-for as second and BAM! They're dead on the sidewalk. . ."

"What the fuck. . .?" You murmured, before looking up and seeing Muzan on top of you also peeking as he sighed, glaring at the people in the cop uniforms.

"Muzan. . .Did you. . . . Kill them?" You looked up uncomfortably just to catch a picture of Muzan's red eyes piercing down on you.

"What does it matter to you? Also, I guess I should have tried to clean up that mess I made. . ." Muzan said as he stood behind you.

"YOU KILLED THEM?!?!" You blurted out, before covering your mouth and hiding behind the tree as you realized the cops looked your way.

"Jesus, Muzan. . . Let's just. . .Get into the house so we can discuss this." You sighed, climbing up on the tree and hopping over the fence into the backyard as Muzan followed you, eyeing the garden setup in the backyard with a trampoline and a small chicken coop as you opened the door and walked into your living room, closing the curtains and turning off the tv. By then, the sun was fully in view as Muzan quickly closed the rest of the curtain in the house.

"OKAY, WE NEED TO HAVE SOME RULES WHILE YOU'RE IN MY WORLD. Clearly, you can't follow the laws that the world put up itself. In exchange for following these rules, I'll tell you part of the future in your world. The present in your world takes place after Gyutaro dies, correct?" You said, looking at Muzan's outfit, as it clearly resembled the one he was wearing in the Upper Moon meeting.

"You know him, too...?" Muzan murmured.

"Of course I do, Michael Jackson. Now, I'll tell you the rules." You said as you pulled out your sketchbook and placed it on the cleared table and opened it, and wrote a bunch of columns while Muzan watched.

"RULE 1 IS THAT YOU CAN'T KILL ANYONE WITHOUT MY PERMISSION UNLESS IT'S IN SELF DEFENSE." You exclaimed, pointing at outside as Muzan slowly nodded.

"RULE 2 IS THAT IF I DO SAY YOU CAN KILL SOMEONE, YOU HAVE TO LEAVE NO TRACE OF BLOOD OR ANYTHING. ALSO, YOU CAN'T TURN ANYONE INTO A DEMON." You continued as Stormy sat next to your notebook as you put down the rule.

"RULE 3 IS THAT ALMOST NO ONE LIKE ME CAN SEE YOU. There's a lot of people in this world that read and watch the show you're from. If they see you, and even FILM YOU, word will get out to, I don't know, the police or something, and soon, BAM! ARRESTED." You babbled as Muzan yawned.

"THOSE ARE THE RULES SO FAR. If I catch you breaking any of them, more will be added." You said roughly as Muzan chuckled.

"Alright, fair enough."

You slammed the notebook shut and placed it on the TV table as you suddenly heard a knock on the door, causing you to jolt.

"Oh god. HIDE!" You whisper-shouted at Muzan as he suddenly disappeared.

"Y/N????? Helllooooo? I'm worried about you, Y/N! Some random guy that looked like Muzan from Demon Slayer just came and just plucked you out of school in front of everyone! Everyone including the teacher were confused! I know he's not your dad, because I've met your dad! Pleaseeee, open, Y/N!" You heard Ava's voice as you sighed in relief. At least it wasn't the cops.

"And the cops are by your house, too! apparently a group of high schoolers were murdered right by your house!"

Shit.

You looked around and ran towards the door and opened it, placing a fake smile. "Heyyyy, Ava!"

"Y/N! I WAS SO WORRIED, DONT JUST LEAVE WITHOUT TELLING ME YOU WERE GOING TO LEAV!" Ava exclaimed as she hugged you.

"I'm fine, Ava, Really. Thanks for worrying about me. Come in." You gestured your friend as you closed the door behind her and locked it.

"Y/N! Have you seen the amount of police cars outside! They're questioning everyone in the neighborhood, and they're going to be questioning you last, Y/N!" Ava exclaimed as you sat down with her on the couch.

"I know right?! I don't know what to say! I doubt they'd blame me, though." You laughed as Ava giggled.

"Y/N, I also need to talk to you about school. Who was that guy?! It's okay if you don't want to say it, as long as you're not dating him." Ava said.

"DATING-!?? SERIOUSLY?! Also, you'd probably freak out if I told you who it was." You pointed out.

"Pleaseee tell me, Y/N?! PLEASEE? I promise I won't tell anyone!" Ava gave you puppy eyes as you rolled your eyes and groaned.

"FINEEE. You can't tell anyone though, promise?!" 

"PINKY SWEAR!"

"Okay. . .You can come out, Muzan." You said, and Ava gasped. Muzan emerged from the hallway as he looked at Ava, before appearing right in front of her and examining her.

"Is this really your friend, Y/N?" Muzan murmured as he looked at you.

"Uhm. . .Yes. Muzan, Meet Ava. Ava, meet Mu-"

"EEEEEK!!! IT'S REALLY MUZAN, FROM DEMON SLAYER?! OH MY GOD, ARE WE HIGH?!" Ava exclaimed, shaking you as you laughed.

"UHM, NO, WE'RE NOT, AVA!" You chuckled as she squealed.

"OKAY, AVA. I think that's enough already. I can tell you more about him tomorrow. You need to get going home, the suns going down already." You said as you opened the door for Ava as she ran out while squealing. You sighed, closing the door as you looked and saw Muzan tilting his head and smiling at you.

"You seem to be the calm one of the friendship." Muzan said.

You sighed. "Always."

You suddenly got a knock on the door again, and you looked out the window to see a police officer standing at your door.

"OH GOD!"