For those of you who know the animated movie "Bubble"
I was thinking of doing a fanfic on it. You would be Hibiki's younger brother of 1 year. The story would be from your perspective, but I wouldn't slack off. You would be able to bubble jump with Hibiki and if you were to touch Uta as well she would have the whole bubble break out.
I was thinking, like Hibiki with his hearing sensitivity, reader (You) could have an issue with speaking. You have trouble pronouncing words, kind of like Uta at the beginning of the movie, so you choose not to speak much until Uta comes along. Much like Hibiki wanted to learn to hear the sounds he longed for and not hate them you would get more confident in speaking because of your relation to her in that sense.
(I don't plan to have romance, but if you want Uta to have an added brother for your love interest I'll consider it)
Please let me know your thoughts.