What if my mother adopted another child with super powers

Its a normal day, everything is as usual as usually. Just another boring day. Everyday the same routine, nothing's gonna change. That's what I thought....

Me Kazuhito Daigara a 16 year old student and my brothers Haruto who is a 18 years old good-for-nothing student and Henry a 12 years old fortnite kiddie, got introduced to our new sister adopted by our mother.

I came home after school and didn't expect anything special, but when I opened the door and came in with my brothers, my mother was waiting to introduce us our new sister. She had long brown hair, ice blue eyes and breasts that looked like fluffy pillows, she was 1,58m tall and her name was Noel Shizukame.

When we came home my mom just said: „Welcome back, and uhhm this your new sister and Kazu make sure to protect her, she is going to get in your class."

I didn't even have a chance to respond, she was already at her room sleeping. So I decided to introduce myself to her: „Uhhm, yea I am Kazuhito and these two are Haruto and Henry. And I am ur new classmate, if you need anything don't hesitate to ask me I am also the president of the student council and the kendo club. I am sorry for that lame introduction, hehehe." She smiled at me in a kind way and went in my room. „Wait, why are u going in my room?" But when I came in my room was split in half, one side was pink an the other one was blue in each half was a bed „Don't tell me this now OUR room!" I said while I couldn't believe that she was my roommate now. Oh gosh this going to be awful.

The next day began and I stood up, but when I opened my eyes I saw my sister naked while she was taking on her school uniform. My nose started bleeding and my cheeks turned red I turned around and my sister was blushing. „This is going to be an awful life" I thought. We had breakfast and went to school. Classroom 1-B, I came in took place as usual and talked with my 2 best friends. The blonde boy called Ikki Sasamiya and the black haired and big titty girl called Kasumi Torizawa. The bell rang and all of us went to their own seats. The teacher came in with Noel and said that she was new. She introduced herself: „I am Noel Shizukame and I live at Kazuhitos place". All the boys looked at me with their envy eyes and the teacher decided to sit her next to me. Oh gosh, why did she say that, anyways I need to tell my classmates that she is my sister somehow or else everyone's gonna hate me. She smiled at me with a really cute smile. She is actually really cute, no I can't think that, she is my sister. Ok I need to focus at the lesson.

So when the break started I told everyone that she is my sister. They were still envious. But I didn't care anymore. I went to the dojo and trained for the kendo club, but suddenly

Noel appeared and asked me if she could try it. I said yes and she took the wooden sword. I positioned myself in front of her. I was suprised, she already knew the basics and she wasn't bad at all. She kept blocking and caught me unguarded, she easily hit me at the torso. If I was more patient and wouldn't have underestimated her I could have won easily. I was just a bit stupid. Anyways she won. I said gg and everything was ok.

When we went home together, without my brothers they left earlier and Henry isn't at Highschool yet, a man tried picking up on my sister failed at became toxic. He pulled out a knife and threatened us, we weren't able to escape, we were in impasse. So I tried protecting her, but I didn't need to. I saw an blue shiny light building up behind me, it was like a giant ball of blue light. So my sister created that thing?? She threw it at the hooligan and he vanished. Waiiiit did she just kill someone???? I tried to speak properly:

„D-d-did u-u kill him??" I mean there was no way she actually killed someone, I just hallucinated. That's it I hallucinated, yep. She smiled at me with her cute and kind smile and just said: „Yup, that's what I've done. U didn't hallucinate or something." Waiit, nooooo waaay. I couldn't believe what I've seen. But then she started to giggle what turned into a loud laugher: „Did u really just thought I killed him?? I just teleported him home. Hehehe. Sorry" So it was just a joke oh gosh I really thought she killed someone. I am glad she didn't. On the way back home I couldn't figure out what that blue energy was. But who thought I would live with such a monster. Anyways I don't think this year would be as boring as expected.