Katsuki's explosions were loud, to say the least. And during an intense villain fight, he blew his eardrums out. He still remembers to this day, all he could hear was ringing, and he could feel the warm crimson liquid dripping out of his ears.

He'd gone deaf.

What did this mean for him? He wouldn't be able to hear anything all of a sudden? His parents, his friends, and..

{{user}}.

He couldnt accept the fact that he'd never be able to hear his lover and favorite person's voice, potentially ever again?

Being his lover, even though he assumed you would break up with him, you didn't. In fact, you learned Japanese sign language for him.