Saiki x Kuboyasus sister!-reader

The grate riveal

Your POV
"How do u know Kuboyasu and why is he afraid of u" Saiki asked me and I could see Aren stiffen so I look at him for permission and he looks at me then hesitated before slowly nodding his head I then notice the three boys staring at us with curiosity and confusion I then say " well u know how I didn't  say my last name in class" I said and all three boys nod I then continued by saying "that is because Aren already felt uncomfortable with me showing out of the blew like that so if I said my last name all eyes would have gone to him" I then got out of the booth and stood at the end of the table the 3 boys watching me in confusion I then said " let me properly introduce myself " they all got ready for what I was going to say and what I said next made there jaws drop " my full name is (y/n)(y/m/n) Kuboyasu I am Arens little sister"

Saiki POV

I was shocked, it made so much more sense now if Kubo-we'll I should say Aren cause there are two now-if he was a delinquent then so would his sister be that was why she looked so strong but that still didn't answer one of my question "if your his younger sis why is he so scared" I questioned " ah yes why don't u tell them AREN?" She answered Aren flinched when she said his name " ummm well there was this time when we were young and I was board so I went to go bother (y/n) while she was reading aaaaaaand that was the worst.mistake.of.my.LIFE. When I walked over and took the book from her I learned never to bother her while she was reading by getting two black eyes 4 missing teeth 8 broken bones all in different places" he visibly shivered " I can still here my bones cracking" everyone was looking at the girl now that looked so sweet and calm, never would have thought that she could literALLY KICK THE SHIT OUTTA ALL OF U RIGHT KNOW IF SHE WANTED TO.
We finished eating and left in utter silence we started to walk home and eventually went out separate ways " well see ya guys nice to meet you (y/n)" Nendo said " for real this time see ya guys" kaido finished walking away with Nendo.
" well then come on u guys we still need to get home so hurry up"(y/n) said as she started to walk off us following behind we reach my house first so I waved goodbye and opened my door only to see blond hair sitting on my couch I instantly slam the door shut and start running the confused Kuboyasus behind me.

Your POV

When saiki waved goodbye he opened his door as me and Aren turn leave saiki slams the door shut and starts running away we followed him in confusion until a blond male comes out and starts to chase us I run faster when I see who he is getting Aren more confused, the male was a boy you met named kusuke saiki (I think that is how u spell his name so don't judge plz) he was trying to pick you up when u went on vacation u were so pissed u almost punched him but u instead left without saying a word. as you ran u sped in front of saiki and motioned them to follow u they did and as you sharply turned a corner u ran into your house letting your bro and saiki in before slamming the door shut and locking it u then turned to ask saiki how the hell he had someone like that but then u realized he was his brother because of the last names so u looked at your bro and said " my room is upstairs go straight to the door on the left at the end of the hall" he nods and goes upstairs not before turning and saying "good luck~" you blushed a little and growled earning a small squeak from the purple haired man and a giggle from the pink "come to the kitchen and talk for a minute will ya" u said making your way to the kitchen he just silently followed you.
When you went to the kitchen you tell saiki to sit down and u go to the fridge and pull out the two coffee jelly's you made and come back u hand saiki a jelly and to your surprise he smiled and started to eat it u blushed and laughed a little getting a look from him before he said "what's so funny, and where did you get this coffee jelly from it's the best I've ever had" "first I find it funny that your smiling while eating that cuz u usually don't have an expression on your face and secondly you can't buy that jelly anywhere even if u searched the whole planet" I answered he raised an eyebrow.

Saiki POV

I listens to what she would say next after I said this "Where did you get the jelly from hmmmm" I said questioning why she would hide such a precious thing from him, she giggle causing him to look on in confusion " I made these jelly's by hand saiki I didn't buy them" she said "oh well you have great skills it's delicious thank u" this made her blush as she stuttered out a "t-thank u a-and yo-your welcome". She turned and went up stairs before she left she said "if u want to stay to get away from kusuke the guests room is across from mine so u can use that, goodnight Saiki" she said " goodnight (y/n)" after you left u hadn't noticed how red the boys face was so he excepted the offer and headed up to the guests room.u on the other hand were chasing a scared Aren around your room for teasing you about how you liked saiki.