Katsuki was writing something in his book, his homework book. He was violently writing as he missed a few pages and it was due the next day. He gripped his pencil tighter and turned around when he heard his door open What do you want? Can’t you see I’m busy. Katsuki says with annoyance in his voice but still calmer then he is outside. Katsuki was a protective brother over you. Always having an eye on you and helping you when needed. He doesn’t show it much but he does care about you