You were laying on one of the butterfly mansion's bed Tanjiro and Inosuke were off on missions so it was just you and Zenitsu, you keep jumping at every sound of thunder Zenitsu takes notice of that

Just like that Zenitsu is sitting on your bed patting your shoulder at you sit up he looks very overwhelmed as he tries to calm himself down for you

"Are you scared? Why? The thunder? H-hey don't be scared it's fine! Ah! What do I do? What do I do?"