Three siblings Two demons (blue exorcist reader insert)

A new friend

(Ok so the winner for this chapter is @AphsKidKintoJO9 thanks for the character)
"Wait you to know each other"I was confused and Sara answered my question with the old "yes he's a meany""HOW ARE YOU ALIVE SARA I THOUGHT YOU WHERE DEAD" wow Mr.Kaoru is really surprised "umm how do you two know each other" I said and before I could say something else father said" (YN) Sara get behind me he's" he got interrupted not by anyone I know but some one jumping thro the window? I was studying him but Sara just ran and hid behind RIN?!?!? WHEN DID HE GET HERE?!?! Regardless he had blue hair and black tips. He had blood red eyes and just stood there and he was about to leave but Mr.Kaoru tried to shoot him!!! He was about to kill Mr. Kaoru when he saw me??? He was just looking at me when for some reason I just fainted
(Sara's P.O.V)
A strange man came out of no where and I just hid behind a stranger dumb me being scared of random demons but I have a weird feeling one is near by other than that window guy he was about to leave when my brother who betrayed me tried to shot him. He was about to kill my 'brother' but missed causing him to get mad what happened next was shocking he just stared at (YN) and she fainted (HAY SARA YOUR BEHIND A DEMON) wha the who's in my mind and wait he's the demon (um I wasn't supposed yo interfere so I'm just gonna go back to my world) um ok voice but still poor (YN) she's passed out I ran up to her and she was still breathing but it was freaky like she was dead yet alive maybe in a coma regardless I'm gonna kill that mean guy who did this and with that I turned around and just attacked the guy who did this crying I yelled at the top if my lungs "WHO SO YOU THINK YOU ARE YOU JUST KNOCKED OUT (YN) YOU DO KNOW SHE IS YOUR PRINCES" he didn't say anything but had a look of guilt on his face and picked her up. Next he walked up to the guy I was hiding behind and the guy just said "follow us you two little girl" in was scared that if I didn't brother would shot me again so I just followed quietly. When we got to the service I followed them to the school mephisto owned I can't wait to see him
( (YN)'s P.O.V)
I woke up and saw I was at school in the nursery Sara was there passing for some reason. Next to her was just that guy from earlier I pecked outside to see Bon yelling at Rin and Run yelling at Bon. The noticed me awake and so did Sara "OMG ARE YOU OK YOU JUST PASSED IUT WHEN THAT GUY LOOKED AT YOU oh um whoops sorry for getting loud I'm just worried" at the sound of that the guy looked a bit mad and bon, Rin, and yuiko came in scolding her. I feel kinda bad for her I guess but what's confusing is the guy just randomly said "sorry about I didn't think you would pass out I was trying to knock out the guy who tried to shot me but I looked to where that little girl was looking and I knocked you out instead none the less my name is.....
(Sorry about the cliff hanger and for not writing my phone got wet I had to get a new one word count; 614)