Male Osoro x Reader: I'll protect you

First day

(So for this fanfic its important to note mostly every character is gender-bend. There isn't a senpai though or i guess you could say you take on the role as senpai. Although there is a difference personality wise. And you are Midori's (who is a guy to) little sister)

Reader's POV:

Today I was walking to school with my big brother for the first time. I had just transferred into  akademi today. The reason I didn't go to the same school as my brother  was that I went to an all girls private school before, but I ended up leaving so I could go to school with my big brother. 

"Hey (Y/n)-chan! Just remember if you have any questions for me just ask", Midori said.

"Actually I don't really have any questions I can think of", I replied and was instantly smacked on the head by Midori.

"What was that for?!", I demanded.

"How dare you (Y/n)-chan! You bring shame to the Gurinu family ! We've been asking questions for generations. Are questions have annoyed and irritated great minds for ages like yandere dev. You must carry on our family tradition and ask annoying questions to! Come on think of something anything", Midori said.

I tried thinking of something to ask.

"Hmm... Well where is class 2-1 located sense thats where I've got to go?", I asked.

"Good question!...I'm actually not sure sense i never bothered going to class and have just always stayed on the roof top. So I can't help you with that." Midori said.

Jeez my brother really is good for nothing. I have no clue how he even passes any of his classes.

"If you would like I could show you where it is" A voice said from behind me.

I turned to see a tall boy with black hair and grey eyes. He was smiling at me kind of creepily.

Something was... off about him.

"Thank you for the offer, but I think I'll manage" I said smiling.

For some reason he blushed then ran away.

that was odd...

Me and my brother arrived at school.

"Okay I'm going to the roof to annoy yandere dev with endless questions~! Have fun (Y/n)-chan! Come find me if you need something~! And remember to ask questions~!"  Midori said then skipped off. 

I guess I should look around a little before class starts.

I walked towards the backside of school going past the gardening area. after I had made it past there I noticed several individuals gathered around the furnace area. They looked quite scary and threatening. The girls were glaring at me and the guys were smirking at me. Two of the guys stood up and started walking towards me.

One held my wrist tightly to restrain me.

"Hey baby. What's a little girl like you doing in a place like this?", The second one asked.

"What are you planning to do to me ?!" I asked trying to pull out of the ones grip.

Before he could respond  a calm yet frightening voice asked, "What the hell are you bastards doing 

The one guy instantly let go of me and they both turned to the man standing there as did I.

Standing there was a tall young man with faint blonde hair that went to his shoulders and amber eyes. He had a x shaped scar on his left cheek. He looked quite frightening but something about him seemed hidden.