Yandere! Younger Brother & Reader (Older Sister)

Scarred

Your head pumped flows of unoxidized blood. The muscle contractions echoing in your mind screeched at every twitch. How unbelievably drained you felt for not finishing the project.
School did seem to be any better.
Not that bad grades were gonna kill you, but today it felt chilly in in the summer heat.
Series of crashing noises bombarded your eadrum, causing you to stumble once in a while. Couldn't the world shut up every now and then!" You clutched your ears to drown the sound, but sadly it didn't help much.
You continued with a long uneven stride. How long did you have yo go to your classroom? Ah, you don't remember; it's hard to think right now- you bump into someone.
You squinted your burning eyes to someone familiar. Arthur? He peered down at you with large grin.
"Well look at you! You're all bundled up." Arthur hugged you. Unable to embrace him back, you leaned a great amount of your weight onto him.

"A-arthu-r..." Your words sloshed out of you mouth. Arthur took up grip of you.

"(Y/n)! Are you okay? (Y/n)!"

Your brain thumped rapidly against your skull. Not... enough... room... Your hands clasped around anything it could. Tearing at sheets and window curtains, until...
you collapsed.
Earliers events appeared in your mind.
It was a normal day to start off with. You and the groupies were scared the teacher was gonna flip about the project pamplets being completely ditched. However, she didn't mention it today.
Everything was, good. A little too good. It's quite the surprise that he didn't join you as you went to school.
You enjoyed the privacy while you could. Laughing, playing games, it was all you wanted to do when you came to school. It suppressed memories of that horrifying night.
You couldn't help feeling a bit curious about Saiyo. Is plotting to steal you away again, is he not feeling well, is he just being a typical brother for a day? You didn't understand why he was so quiet this day in particular.
By 4th period, you decided to let it go. Roy and Arthur were in full out war mode. Hands flew about the air-
"ROCK"
"PAPER"
"SCISSORS!!!"
You giggled at their rivalry, observing their picks. Roy had scissors and Arthur had paper. A displeased look spread across his face. He turns to you with knitted brows.
"Oh m'lady! Won't you please grant poor 'ole me strength? " He pleads with a small smile. You play along with him.
"Why, of course my darling! By the power vested inside me, I'll grant your wish under one condition. " You smirk. He nods his head, that of a knight under service.
"Anything for you, my queen. " Roy rolls his eyes, disinterested with any words coming from Sir Arthur.
"I am no queen, and you are no slave. Lift you head when you speak- man." You nudge his chin up with you finger.
"At high sun, I get to have a fourth of your lunch" You squeak happily.
"Of course m'lady!"
Arthur spins to face Roy. Hands balled up in a fist, he shouts-
"ROCK, PAPER, SCISSORS!"
Roy places his rock proudly, but Arthur, in his favor, has paper for a counter.(ATK)
"Yay!" He rejoices victoriously. He hugs you deeply with gratitude.
"Thank you, thank you so much!" Arthur rubs his hand at the back of your head. You fluster at the sudden attention.
"Yeah, no prob."
Arthur takes your, resting a knee on the floor. He gazes up at you with shinging eyes.
"M'lady, why won't you marry me? I need you." He kisses the back of your hand. You heat up.
"I'm not ready for this-" you prompt and avert you eyes in a hurry. Roy butts in between the two of you.
"*AHEM*, Sorry but she's not up on the black market. She's staying single so she can mingle with me!" Roy tugs you away.
"This is none of your business! "
The differing boys began to argue. Too bad Kiriyu missed out on the fun, he had to go out of town for a couple of days.
"Guys, stop fighting, or else none of you will be able to mingle!" You threatened sharply.
"They jumped back with haste, gulping and swinging the heads up in down in check.
"Not again!" Roy cover, crossing his legs. Arthur tilted his head in confusion about his situation there.
"I don't see any beach balls, sorry Roy if you were expecting something to happen." He shook his head throughly.

Soon precious lunch came. Time for face stuffing and chill. Instead of eating in the garden, y'all decided to enjoy the breeze on the roof. Clear skies usually signal clear paths, right?
You were looking forward to that forth Arthur promised you. Your smile brightened with the sun. Could this day get any better!?
Roy arrived first after you. He didn't bring much to dine on, but it sire looked delicious! He sat down along with you, opening up his little rectangular box.
"Watchu got their? Smells good~." You sniffed the air.
"Oh, this? It's my mom's lasagna! It's pretty much the same as the one we had when you came over."
"Oooo~" You cooed, drooling at the sight of melting cheese drowned with tomato sauce.
Arthur bursted through door with a large grin sweeping his face. He seemed prepared for a gourmet prize.
"Hello, Roy! Beautiful weather we're having!" He plopped down beside you. Roy squinted at his enlightenment.
"Are you ready for some lunch (Y/N)?" He sparkled before you.
"Bring out the food!" You chanted onward. Arthur brought out a humongous box. It wasn't tall, but it sure was wide!
Unlifting its top, the fresh aroma of his set out shocked you. It was definitely a dream come true!
"Open wide!" He said motioning a fork of sliced steak to your mouth. You leaned over, your mouth practically flooding with desire to chomp down, however the roof top door was opened with an eruption.
Saiyo sood their, hands behind his back, eyes half lidded. You waved at him.
"Saiyo, shouldn't you be eating with your class. I thought you lost the privileges to eat with the upperclassmen for a while?" He began taking slow steps towards your lunch bunch. His steps were heavy, not hesitate, but more planned out.
He approached Arthur, his eyes set a flare. You reached out- not in time.
Saiyo swung at Arthur. A silver glint was all you could see. He slashed right up the side of his face, right down his eye.
Blood sprayed out onto you and Roy. A face of scared man was replaced on Arthur. He gripped the side of his incision grunting in complete utter pain.
You would never know the sound of a grown man cry, until now. You stood up, ran over, and back handed Saiyo your broth- no, your torturer.
"WHAT IS WRONG WITH YOU!" You back petaled to Arthur pressuring his around his eye wound to stop the bleeding.
Roy held back Arthur's arms to allow you to treat him.
"Just leave!" He shouted.
"You've done enough!"

Minutes later, Saiyo was evaporated from the scene, and Arthur was on his way to hospital.
There's not enough room. Was there never room? Your brain expanded as well as you heart bouncing here and there.
Every step of the way, you were right along side Arthur. You should've been able to stop it. It could've been prevented, and he would've been okay.
Please answer the questions below with comments to provide further enhancement with the story's plot.

1. Should Arthur survive?

2. Should I create another love interest to provide comfort for (y/n)?

3. School trip ideas.

4. Do you like Kiriyu?