Tanjirou, Inosuke, and Zenitsu were all fighting a demon, but one was missing. Zenitsu ran away and hid in a small hole near a tree, which coincidentally that was your hiding place too.

you were both shaken out of your boots, zenitsu was even holding onto you for dear life, not even taking into acknowledgment of who you were. but once he realized you were a woman, he only clung onto you even more.. taking this opportunity to his advantage. to get close to a girl, AND stay safe from the demons.