Yandere! Younger Brother & Reader (Older Sister)

Gone Rogue

I was rereading some of my plot enhancement comments, and noticed that this story doesn't really seem like yandere story. So now I'm basically fixing the components of this story. I hope that everyone bears with my incapableness, and continue to read the story. Anyways, enjoy!
Also it might be hard to follow this chapter, due to the pov changing all of sudden. I can't list whenever it happens because it's supposed to be sudden soooo??? Hang in there

(Y/n) and Kiriyu dropped all off the grocery bags with the exception of on, in which (Y/n) now tugged closely in front of her. Her hand quivered at the scene displayed before her. Saiyo had struck once again.
Roy pinned against a run down shop's exterior, cuts aligned on his neck and jagged ones with bruising upon the base of his palms. Kiriyu rushed to defend his friend, but stopped in the middle of his rush as Saiyo rotated himself around to peer on the latecomers. His interest peaked spotting his kin. 
"(Y/n)! Where were you? You haven't been home for a while and it made me very anxious to see you." Saiyo tipped his knife, the dulled shine more menacing then before.
"What did you do to Roy?" You calmly said, hardly managing to grip your last bits of sanity. Saiyo slowly spun his head to glance at the boy in boredom.
"Ah, I simply asked him where you were. Such Rude kid; had the audacity to lie to me-"
You clutched the hand loops of the plastic bag tighter.
"Saiyo, why do insist on harassing my friends? They've barely interacted with you, so what could possibly have against them!" You released a hysterical chuckle out.
"They took you away from me! How else could I respond to a sign of kidnapping!?" Saiyo unexpectedly bursted out emotionally. He rose the in his hand in rhythm with his words.
"You shouldn't have hurt them in the first place, even if you didn't know them! Not all of my business  is yours." You hesitantly approached your brother, lowering your defenses a bit. Kiriyu instinctively stepped in front of you, but you nudged him away.
"Say sorry!" You griped, fastening your hands on his shoulders. With Saiyo's hands outstretched, the knife ran warmly across your cheek. Though, it didn't  matter to you.
Your arms began to slide under his into the form of a reuniting hug. However, they squeezed him intensely.
"Say you're sorry to my friends! To Roy, to Kiriyu, and especially to Arthur!" Your emotions empowered you to continues, causing you hug to become strangling.
"Sis-" Saiyo's words became cut off as his body struggled to supply blood to his torso. He patted your back in an attempt to soothe your nerves. Roy and Kiriyu were taken aback and shuffled away a few steps upon witnessing your love and anger.
"O-okay sis", rasp, "I-I'll apologize, y-you can ... let me go." You delayed your release, but decided to be reasonable. Saiyo grinned and turned to speak to the men.
"I'm sorry for all the inconvenience I may have caused you." You smacked him.
"Wipe that smirk off your face! Mom and Dad would be so disappointed in you, knowing that they taught us manners. Also, say sorry correctly!" You huffed out at him.
"I'm sorry for everything I've done intentionally to inconvenience you and or cause harm to you. I hope in the future you could all find it in your hearts to forgive me, along with future friendship!" Saiyo bowed down while gripping the side of his cheek. You crossed your arms eyeing you brother.
"Sorry Kiriyu, I won't be able to escort you home today. Please take Roy to get checked out at the hospital. I'll see to that Saiyo is appropriately punished for his actions. Also, it might be better if I stayed to oversee his actions to come." Kiriyu nodded and tended to Roy's injuries. You however, grabbed a hold of Saiyo's wrist and proceeded to forcibly drag him off. Unaware of what had become of their home the past few days.
^_^

If you are interested in any of my future stories to come - check out my writing diary! Which might have spoilers to stories I already have posted, but oh well!