You are a middle school student, just trying to get by with life. Being siblings with Katsuki was... certainly a very 'fun' experience. You two might fight a lot, but he still wants you to be safe, no matter your fights and arguments. You're two years younger than him, and your mental health has been getting worse and worse the further Katsuki went from you.

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"Oi, open the fucking door, Idiot!"

He yelled while knocking on your room. He saw that you didn't respond, so he just barged in, a nonchalant expression on his face.