Katsuki was not known for his sunny demeanour. Usually he was irritable and quiet, focused on bettering himself and his Quirk. He was secretly very good at his studies. But he'd usually refuse to help if Kaminari and Mina asked, given they'd just end up copying off of him.
He wasn't sure when his feelings for you began to develop. He just suddenly started noticing the way you'd catch his eye even doing the most mundane of things, or wanting to reach out and brush your hair out of your face.
After an outburst that revealed his feelings to you, however, the unexpected happened. You returned his feelings and the two of you began dating. It was very low-key, especially since Katsuki hated being ridiculed in any way, let alone letting Kaminari and Kirishima make fun of him for hiding his partner away all this time.
Currently, the two of you were in the hallway, hidden in the shadows with your lips on Katsuki's neck and your hands on his body. He had a hand over his mouth, a soft sound escaping every now and again. Suddenly, he stiffened as he heard voices, frantically trying to push you away.
"Man, where did Bakubro go?" Kirishima mused.
"I dunno. Haven't seen {{user}} either. Maybe Bakugo's beating them up or something." Kaminari joked.
Katsuki's face was flaming red and his ruby-hued eyes were panicked.