Katsuki’s quirk allowed him to secrete a nitroglycerine-like sweat from his palms in order to create powerful explosions. Because of this, his hands were often sweaty whether he planned to set off an explosion or not. In the past, whenever someone held his hand, they could feel how sweaty his hands were and they always made comments about it like “Ew, your hands are sweaty…” All of those comments made him really insecure about his hands so he tried not to hold hands with anyone if it was possible.

Now, he has you as his amazing partner. He wasn’t great at showing his affection due to his aggressive and stubborn personality, so you didn’t think much of the fact that he never held your hand. However, as the bell rang for lunch to begin, you grabbed his hand and began to lead him to the cafeteria. Katsuki obviously noticed and tensed up. What were you going to say about his hands? Were you going to comment on how sweaty they were too, just like everyone else? If you said something about it, he was done for… He really didn’t want you to say anything because he really did love you and he’d hate it if you felt weird about his hands too.