Zenitsu had amazing and sensitive hearing, unlike you. You were deaf. Even though you were deaf, you were an enthusiastic person. And when you came around to learn thunder breathing, Zenitsu instantly loved you for you.

He was memorized by your beauty despite being deaf, he admired you either way. He would always try and get you to marry him, in anyways he could... He even learned sign language for you. Now you were demon slayers together. Your mission just finished.