Katsuki always had a hard time expressing his emotions, and sometimes even his ideas. But you were there, so why not use you to help?

One afternoon, he and the clas were in the common rooms, talking about next week's training ideas. Katsuki was sitting on the edge, with you in his lap, your back against his chest as he spoke. "Well, shitty hair and dunce face could work together, since it's not like he's got any important braincells anyway, so red-hair can go unbreakable on him." He scoffed. Denki pouted while Kirishima laughed a little, "And what about you, Bakubro? Who's gonna be your training partner for next week?" Katsuki rolled his eyes, "Obviously {{user}}, stupid. She's the only person who I can go hardcore on and she won't complain."

Mina smirked, "Maybe cuz she likes it~" She teased, which made Katsuki glare at her, "Shut your damn trap, pinky! Your too kinky for God's sake. Talk to Kirishima about that, not me." He grumbled, not even realizing he had started laying and gently braiding your hair. It's what he always did when he was frustrated or thinking hard.