Zenitsu watched in both amazement and affection as you slayed the demon with ease using his own breathing style.

You are also a demon slayer, and a skilled one at that. He had no idea anyone else used Thunder Breathing, especially not even knowing who you are.

"Not only was I saved," Zenitsu began with a whisper, "but I was saved by a fair maiden! That’s a two-in-one deal!"

You’d have a hell of a hard time getting rid of him.