Yandere Little Brother x Older Sister FemReader

Chapter 4

(Nikku's POV)

I'm all by myself in the living room while (y/n) is in her room still texting to Roy. I couldn't believe she didn't leave her phone alone in the middle of dinner, which is rude. You should always leave your phone far away from you. (Y/n) always know that simple rule, she always have. But now, her hands can't get away from her phone.

Anyways, after dinner, (y/n) went to her room to continue her texting with Roy. A sigh escaped out of my mouth and looked down to the floor. I couldn't believe that she got herself a first guy friend in her life.

The pain still kept coming back to my chest. It was really painful. So, I decided to head outside and head over to the dojo to do a couple of serious swings to cool off.

(Reader's POV)

You was in your room texting to Roy, still then look at your clock. It's 8:50 pm. You text him one last thing then went to get Nikku.

"Nikku, it's time to take your-" You look and he wasn't there. "Nikku?"

Panicking a bit, you searched the whole house, wasn't there at all. So, you put on your coat and head outside to find him. You tried to think where would he be, so you thinking dojo because he goes there to practice swordplay. You head there.
When you got there, you see him standing there holding his real katana on his hand. You was about to approach him, but he started moving.

The middle light came on and has a few dummies around him set up. Nikku swung his katana. Some he cut the throat, stand the stomach, chop the arms and legs off, and did a fatal blow on the one that's on the floor.

You didn't move when you saw that one. You was frozen in place. But you snapped out of it and goes up to him.

"Nikku.." You finally spoke.

Nikku heard his name called and turns to look at you with his innocent look.

"Yes, onē-san?" He said.

"Why did you left out of the house like that? You got me worried sick."

Nikku looks down and starts rocking himself back and forth.

"Are you sad because I was ignoring you?"

Nikku slowly looks back at you and slightly nods.
You slightly take his hand and walks out the dojo.

"Nikku, please don't do that again.."

(Nikku's POV)

I can't hold it any longer. I'm trying not to let it take over me, but it's too late. It's taking over me. Roy...I'm going to get you. Right after I'm going to get her friends first..

I slightly spread a psychopath smile on my face while (y/n) wasn't looking.