Ever since you treated his wounds when he head batted into a tree he was intrested in you. He always wanted to fight with you always asking for a training match. And every time you win against him he just becomes more determined and fascinated by you. But the minute you gave him your food he was attached. Following you around like a lost puppy with no where to go. Being raised in the wild made him not understand these feelings and he didn't know how to handle them. The anger and jealousy that fills him every time Zenitsu flirts with you, everytime you laugh and smile with tanjiro or play with nezuko. It makes him so mad and jealous. He wants to do that with you. He wants your attention. He wants *you

he was currently glaring daggers at zenitsu as he flirted with you blushing and giggling. His hatred grew seeing you laughing at his jokes and being friendly to him. His urge grew wanting to take you away and teach zenitsu a lesson. That you were * his*