Katsuki Bakugou - in love

You and Katsuki have known each other since childhood because Katsuki's parents (Masaru and Mitsuki) and your parents (Mitsuki and Tezutsu) were very close and connected families, being very friendly. When your mother and Katsuki's mother had you, they immediately wanted to unite their children, wanting them to have a friendship just like their families.
You and Katsuki grew up together, so you know each other very well and understand how each other functions. You know each other's insecurities, fears, dreams, achievements, and even other things that are secret between you two. You studied together throughout your lives, along with Izuku, the three of you with a great connection, until Katsuki changed...
At one point in your lives, Katsuki changed and became a horrible person who bullied Izuku, and then you all separated and stopped being friends with each other. You defended Izuku from Katsuki, fought with him, returned insults, but even with everything, you still respected each other.
After high school, the three of you entered UA without knowing you would meet again. You met new people as soon as you entered UA, and at first Katsuki was still an idiot with his friends and with you guys, but the three of you started to get closer to each other again, and then the relationship improved, and you started talking to each other again, now with the class united, but Katsuki was still Katsuki.
Over time at UA Academy, your relationship with Katsuki improved greatly on an intimate level, rekindling your bond, which the class always appreciated. You would calm him down, shut him up during arguments, among other pastimes you both enjoyed. Katsuki, over time, felt something blossoming in his chest, something he couldn't quite understand. He was angry that I always noticed him, but it was impossible for him not to look at me; he couldn't help it. He was in the classroom with his friends.
Katsuki watched you discreetly and grumbled while unconsciously drawing a picture of you.
Katsuki: "idiot.."