The Demon's Little Sister

1

"SHUT THE FUCK UP KUROO!"

You flinched, looking at your older brother- who happened to be on a phone call. "Everything alright, Mori?"

Morisuke turned to you. "Oh... sorry, Y/n. Kuroo's being a fucking dumbass."

You gave a small smile. "What is he whining about this time?"

"He and Yamamoto are becoming desperate for a pretty female manager."

You sat up, putting your laptop to the side. "Why can't I be the manager? I'll be starting high school next month."

Morisuke flinched, looking at you with wide eyes. "No way! My precious baby sis is not gonna be around those guys!"

You sighed, leaning back in your seat. "Why not?"

"Kuroo and Yamamoto are the two guys that you should never be around! Kuroo's a playboy and Yamamoto is a desperate fool!"

"Mori. I'm not a baby. I can take care of myself. Couldn't I just be around other first years? Or you and Kenma?"

Morisuke sighed. "You could stay around Kenma and I. I just still don't wanna risk anything, though."

You gave your older brother a reassuring smile. "It'll be fine, Mori."

He walked over and pulled you into a tight hug. "Ok. I'll protect you, just in case."

You hugged him back, a pure smile on your face. "Thanks, big brother."

Morisuke kissed your forehead. "Anything for my baby sis."

"Do your teammates even know I exist?"

He hesitated, not meeting your gaze. "No.... I never mentioned you."

You sighed, still smiling. "That's fine. Do you think they'll like me?"

Your brother beamed with pride. "Who wouldn't like you? You're my baby sister: the most perfect little angel to ever exist!"

You giggled at your brother's over-exaggerated praise. "Ok, ok. Let's get going. I don't wanna be late on my first day!"

"And responsible? My little sister is absolutely perfect!"

"Mori!" You playfully whined.

Morisuke smiled and grabbed your hand. "Alright, alright. Lemme take ya to school."

"I'm not a child."

"You are to me. I hold your hand and protect you- no arguments!"

You giggled and allowed your brother to take you to school, never letting go of your hand even once.

"Yakkun!"

"Oh for fucks sake...." Your brother grumpily mumbled, trying to ignore the very obvious approach of several boys around your age.

You heard a gasp before someone blocked your path. You looked up to see an annoyingly tall boy with messy jet black hair.

He smirked, eyes trained on both you and your brother. "Since when did you have a little girlfriend, Yakkun?"

Morisuke glared at the boy. "Shut the fuck up Kuroo. And Y/n isn't my girlfriend."

You gave a sweet smile. "Hello! I'm Yaku Y/n! Nice to meet you. I'm Morisuke's little sister."

A boy with fairly long dyed blond hair, dark roots showing, looked up from his handheld gaming console at you. "She's short."

"Yep! I'm 5'2", just 3 inches shorter than my brother!" You beamed, taking pride in your small stature.

"Oh? Confident with that shortness, huh?" Kuroo smirked.

"I take pride in my appearance."

"I like that confidence, cutie."

Morisuke pulled you behind him, not letting go of your hand, and glared at Kuroo. "Stay away from my little sister, you fucking rooster."

Kuroo frowned. "No fun. Kyanma! You try talking to Yakkun's cute little sister!"

Kenma sighed and turned his attention back to you. "Escape while you still have a chance."

You giggled. "Aww, but I already convinced Mori to let me your manager!"

A boy with a mohawk jumped up to you, eyes wide and a stupid smile spreading across his face. "We get a pretty female manager?!"

Morisuke glared at the boy. "Fuck off. Y/n is only hanging around me and Kenma. The rest of you- I'm talking specifically to Kuroo and Yamamoto here- stay away from my baby sister!"

You quickly looked at the time and started pulling your brother's hand. "Come on, Mori! I don't wanna get to school too late!"

Morisuke's eyes widened. "Right! Let's go!"

"Shit! How did we stand here and talk for so long?!" Kuroo grabbed Kenma's uniform jacket collar and started pulling him to school.

You looked at all the guys and smiled. "This school year already seems like it'll be fun!"

Author-chan here!

I don't care how tall you are, for all intent and purposes for this fic, you will be Nishinoya's height since Yaku is your brother and he's only 5'5".

I'm 5' so this is adding height for me

For now, this will be kinda cute and funny. Morisuke will be sweet with you only in private, cuz he got a reputation to uphold and won't show anyone how sweet he is.

Kenma doesn't care much.

Kuroo and Yamamoto are already excited for you to be manager, their behavior will only get worse and end up pissing Morisuke off more.

First years will be introduced soon, wonder how that'll go

Anyways...

Please enjoy and thanks for reading!