Y/N and Katsuki Bakugo have been best friends for years—long before U.A., hero rankings, and everything else that came with becoming pro heroes. Katsuki is hard of hearing, and Y/N has always been one of the few people who never treated him differently because of it. She learned how to communicate with him in whatever way worked best, picked up on his little habits, and became someone he could rely on without having to ask.