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starglow-xx · 3 years

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(About the brother!atsushi) aRE YOU READING MY MIND MISS?! Because that has been on my mind for MONTHS. TYSM For writing it was amazing!! If you don't mind, may I request (if requests are open) atsushi, still an older brother, but with a sister that's 10-13 yrs old? It's totally fine if you don't wanna do it. Keep up the good stories, ily mwuah!

*sobs* you’re so kind thank youu 🤧🤧

i wrote this a bit differently i hope that’s okay anon! at first i planned for this to be mainly abt atsushi and the reader, but i decided to add in relationship hcs with the agency bc i ran out of ideas

if you guys liked this don’t worry! im planning a special part two for this one so be the look out for it hehe

atsushi with a tween! sister

ft. the armed detective agency

like in my baby sister hcs, you’re still the most important thing to him period

the two of you got picked up by dazai and kunikida when he was 18 (obviously) and when you were 12

for a 12 year old, you were a bit small bc of malnourishment (which makes atsushi feel so bad) so both dazai and kunikida thought you were a bit younger than you actually were

they assumed you were about 9-10ish

you and atsushi both share a favorite food !! chazuke :)

so when kunikida treated the two of you, he made sure you got more bowls bc like i mentioned above, he feels really bad that you were malnourished and under weight

(don’t bring this up but kunikida felt bad too hehe)

when dazai went with your brother to the warehouse, you were with kunikida

imagine the surprise of the other ada members when kunikida came in with a little girl dressed in rags that popped out from behind him

kenji was the one who vocalized his thoughts

“kunikida-san you have a daughter?! wow! i didn’t know that! :D”

when you found out your brother was a tiger, you were a bit concerned but you were actually kind of excited

you were even more excited when you found out the two of you were going to be taken in by the agency

anything was better than the stupid orphanage

and besides!

you got a tiger for an older brother and a bunch of other super powered agents to take care of you! who could want anything else?

at your age, you’re very impressionable and can be influenced easily so atsushi makes sure to teach you more in depth of good morals and the importance of kindness

his heart swells with pride and relief when he catches you being kind to others

pride bc he’s proud that even after all the two of you have gone through, you still ended up being a good kid and having a bright view of the world

and relief bc he hasn’t failed as a big brother

pfftt like he could ever fail

but please, from time to time reassure him that he’s perfect and the only big brother that you’d ever want bc he rlly needs that kind of validation

with his salary and savings, he tries to buy nice things for you

what a sweetheart 🥺

he saw you eyeing that one dress at a store window? fast forward abt a week and half and it’s inside a pretty gift bag for you

you wanted to try that dessert from the nice bakery? that’s dessert after dinner at one point

but other than buying you things, he sets money aside for you

like all the time

(y/n), here have this, you might need it”

“but nii-san you just gave me—”

“take it”

#1 spoiler

also your #1 confidant and source of physical affection

you tell him anything and everything (except crushies and those kinds of things)

atsushi loves it when you talk abt your day and he can see the big smile on your face and the sparkle in your eyes

it gives him the strength to keep going 😖😖

the two of you aren’t as touch starved as you’d probably think, but that’s only bc the two of you had each other

in your opinion, no one can match the hugs of your big brother

and it got even better bc YAYY he has tiger arms now ٩(◕‿◕)۶

if you ask, he’d carry you around too hehe

you also get nightmares quite often so he’ll always be there ready to calm you down, talk if you need to, and rock you back to sleep

god i love him 🤧🤧

atsushi will do everything in his power to protect you and make sure you get to grow up happy, supported, and loved

port mafia attack? oop he’s already taking you to the nearest escape route

someone is starting to harass you? they just got suckered punched into the next week

you want to go out to have some fun? he’ll go ask the president for a day off

you’re not feeling well? he’ll take another day off and take care of you

whatever you want to do, he’ll do it with you! (as long as it’s within reason)

will always be your #1 supporter! and he’s the president of your fan club hehe

he loves you so so much and will do anything for you; your life and happiness will always be more important to him

you are his reason to keep going

agency head canons !!

atsushi is your big brother, but kunikida is most definitely some sort of father figure

everyone can see it

except kunikida of course

kunikida scolds you lightly if he thinks your manners need work or if you make a mess in the agency

you listen to him of course and in turn as some sort of a reward, he’ll give you pieces of stationary

he always gives you the nice, good quality kind and you’re over the moon

atsushi adores it when you come running to him showing your new notebook or fountain pen and blabbering what you’re going to do with it

sometimes it isn’t even as a reward for being a good child; he’ll just give it to you and he’ll say smth like “i noticed you’ve used up your last notebook quite quickly, so here’s another one” or “did you run out of ink? here have this then”

he usually has a soft spot for children in general, but he most definitely has a soft spot (or a thousand) for you

yosano is kind of like a motherly figure to you

she gives you the guidance a mother should and goes on shopping trips with you!

atsushi always gets dragged along by you, but he thinks it’s worth it seeing you look so happy

yosano being a doctor also tries to teach the things you should know, or things that would be helpful to you

she’ll teach you the basics of cooking, sewing, how to treat a cold/fever, etc

also gives you excellent advice 1000% of the time

“remember (y/n)-chan if someone hurts you come tell me and then i’ll chop them into—”

“yOSANO-SENSEI DONT TELL HER THAT—”

fukuzawa is like a father to most in the agency but you see him more as a grandfather figure

bi weekly tea and gossip sessions hehe

along with cat talk!

most of the time though, it’s just you talking and him listening to you, but the two of you enjoy it nonetheless

“and then kunikida-san ended up crashing into a pole and dazai-san started to laugh at him and i did too because it was really funny but we ended up getting scolded—”

“hmm i see...”

he’ll let you stay in his office as he fills out paperwork; you’re usually doodling or drawing in your notebooks

sometimes he’ll meditate and you’ll join him, but 4/7 times you’d fall asleep

you always wake up with a blanket over you

dazai is like a cool but a highly concerning and kind of high maintenance uncle

frequently takes you out with him when he ditches work

walks in the park, eating at uzumaki so he has the excuse of treating you so he doesn’t have to pay his tab avoiding kunikida and sometimes chuuya and akutagawa, all that fun stuff

also tries to not talk abt suicide in front of you especially if it’s just the two of you alone

he knows that you mean the world to his pupil and that said pupil would probably hate him for putting suicide inside your brain

he teaches you random but useful things like how to pick a lock, how to steal kunikida’s notebook if you’re looking for some information, how to sweet talk your way out of things, etc.

is also the one to tell you that if you ever get a significant other to introduce them to the agency first

he always wants all of your gossip; some of them work pretty well for blackmail

“dazai-san! dazai-san! did you know that kunikida-san lost his glasses and he was looking for them for nearly an hour when he was just holding them the entire time??”

“woah really (y/n)-chan?! hey hey can you say it again into this recording device so kunikida-kun would believe me when i tell him—”

always ends up giving kunikida a heart attack when he says that you’ve been with him all day

ranpo is also like a cool but a highly concerning and kind of high maintenance uncle

will share some of his snacks, but don’t push it or you might not get anything at all

loves it when you compliment him

if you tagged along with him and your brother on a case, he will show off to impress you

“...and that’s how the crime happened”

“UWAHH RANPO-SAN YOU’RE SO COOL”

atsushi is lowkey and kunikida is highkey stressed that ranpo’s eating habits will rub off on you

“ne (y/n)-chan do you wanna try this highly caffeinated drink and this concerning amount of sugar filled snack?”

“can i really?!”

“rANPO-SAN NO—”

ranpo definitely does stuff like that on purpose

the tanizakis are like siblings to you!

a weird set of siblings but siblings nonetheless

the two of them adore you and think you’re precious

atsushi definitely knows how to do your hair whether it’s long or short but he got even better at it when he asked the two

hehe braid trains are definitely a thing + kyouka and kenji (and maybe even dazai)

sometimes you have sibling swap days

you’re with junichiro for most of the day and atsushi is with naomi

strange i know

each of the tanizaki siblings try to make it fun bc they know that the two of you did not at all have a happy upbringing

junichiro likes spending time with you by taking you out to different places that naomi likes to frequent

like the mall, different stores and restaurants, the park, places like those

naomi does the same thing with atsushi so if you ever bump into them, you go out and eat together :)

besides atsushi, the next one in line who spoils you the most would be junichiro (and yosano & kunikida both coming in at a close third)

he honestly can’t help it; you remind him of how naomi was when she was younger

and besides

he’s always been a sucker when it came to the happiness of a little sister

“would you really buy this for me junichiro-san?!”

“of course! don’t worry about it” :)

wanna talk abt boys/girls/celebrity crushes things like that? naomi is your girl

you feel a bit embarrassed to go talking to yosano or your brother abt that and kyouka does not know a thing abt them either

“uwahh naomi-san look at all these people in this magazine! they look so good!”

“right?! but of course onii-sama is still the best—”

you get along with kenji and kyouka quite nicely being roughly the same age as them; they’re also like siblings!

just pure, wholesome vibes from the three of you

you’re over the moon when she finds out that kyouka is staying with you and your brother

atsushi is twice as happy seeing you talk your mouth off and finally having a girl around your age to talk to

“do you think demon snow can change how she looks?”

“hmm... im not sure...”

you and kenji talk abt anything and everything

he even teaches you how to take care of plants!

sometimes the two of you are kind of in the same boat bc you don’t know much abt yokohoma being stuck in the orphanage and kenji doesn’t know much abt cities in general

“wait where are we again kenji-san?”

“ah we’re close to the ports! but im not really sure how close because i don’t know what the symbols on this sign mean”

“don’t worry! neither do i!”

bonus things!

yosano was kind of too late teaching you abt you know what

“NII-SAN IM BLEEDING IN BETWEEN MY LEGS”

you’re sobbing in the agency’s bathroom and atsushi is panicking trying to get you to open the door

“Y/N?! H-HOLD ON LET ME GET YOSANO SENSEI”

ranpo overhears and cackles making everyone around him confused

suddenly atsushi bursts in the agency basically on the verge of tears rambling incoherent sentences abt the bathroom, you, and blood

it just clicked for everybody in the room

(im going to pretend that kenji has sisters back home so that atsushi is the only one who remain oblivious here hehe)

atsushi is genuinely confused and sort of concerned that no one is freaking out with him

yosano waves her hand saying smth like that she’d take care of it and junichiro pulls atsushi to the side to talk to him

fast forward like half and hour and dazai and ranpo are cackling on the looks of both of your faces

honestly not sure who’s more traumatized, you or your brother

“why does this have to happen” :(

“ne ne (y/n)-chan!~ you’re too young but at some point you’re not going to have it!”

“uwahh really dazai-san?” :D

“yeah! but first you have to have ANFK—”

next thing you know your ears are being covered by your brother and dazai is thrown across the room by kunikida

you know

the normal

you’re twelve and have never gone to school, but the agency takes care of that

it’s too dangerous to go to school so they teach you what’s necessary and whatever else they can

kunikida takes care of math (obviously)

yosano takes care of science/biology/anatomy/health (whatever you wanna call it)

ranpo even dragged poe to help you with english

atsushi even got lucy to help you out with english too!

as tanizaki and naomi used to be students, they give you their old work books and they try to teach you all the other subjects

sometimes kyouka and kenji are there learing with you too!

sorry if there’s some errors! i’ll read through it again later :)

and as always, reblogs and shares are appreciated! i hope you all stay safe! and just in case nobody told you they loved you today, i love you! you are enough! <3

writing belongs to me! please do not plagiarize! the reblog button is there for a reason

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