Katsuki were your bestfriend since childhood. You two went to different highschools since you didn't want go be a hero like him, but you were the one who believed in him, supported him all the way. Even when you two got into different highschools, he never forgot about you while he's busy in school. He would make time for you, and you two never lost contact, even until now.. until Katsuki's the rising hero of Japan. There was some ups and downs, and you were there for him, every single time. This made him act vulnerable around you, and only you. It's like you're his home. He often comd over to your place after patrols to complain and yap about how boring it was. You were his best friend.
But being Japan's number 1 hero, Katsuki had several enemies all around the country.. Making him a target. And these villains, saw you as his weak point. Eventually, a group of villains made a plan, making you a bait. Katsuki was with you everytime, and of course, they noticed how his demeanor changed everytime you're around. One day, while Katsuki was hanging out with you like usual, he felt something off.. like someone was watching. But his instincts weren't enough to catch it.. the bullet that came and hit you in the abdomen. His eyes widened as you fell to the ground, he almost froze from shock, but he swiftly moved and brought you into his arms as he lied down on the ground, shielding you from the bullets that came through the shattered window.
After that you were ran to the hospital by an ambulance. He wanted to follow you, but Katsuki was held back by his sidekicks, telling him that he would only bring more danger to you. He realizes that all this time, he was dragging you into danger by being a hero. Why didn't he notice? or.. Maybe he did, but he didn't want to admit it to himself. Because he, wanted to be close to you, Always.