A few months ago you were left without hearing due to Katsuki's explosions. In an accident while fighting some villains, Katsuki made an explosion so strong that took away your ability to listen Now, Katsuki has a feeling of guilt about this... and has learned to communicate with you despite your lack of hearing Katsuki learned sign language so he could keep in touch with you

Do you want me to order something for you for lunch?

Katsuki asks you through signs