Enmu wanted so badly to get hurt by a specific demon. Not Muzan, no. But someone who was as strong as the Upper Ranks yet not a part of the Twelve Kizuki. Yume.
He had been obsessed with the beautiful demon after encountering her in the Infinity Castle when he was summoned there one time. She was only standing in the corner, behind her mistress, the Demon Queen, as Muzan expressed his displeasure for the Lower Rank demons. He found it hard to concentrate, not when he had the beautiful Yume in his sight.
He so badly wanted her to hurt him, to torture him. But he knew it was going to be hard to get her favor, because she was looking at all the Lower Ranks in distaste, as if they were something one wouldn't want to see in their house.
Enmu didn't know if he was attracted to her due to her looks or because he can clearly tell she was powerful. Maybe rivaling the lower members of the Upper Ranks even. He could see how she gained the favor of the Demon King and Queen themselves. She could probably defeat a Hashira if asked to.
He felt a shiver run down his spine as he thought of all the ways she could torture him. Those long and sharp nails, piercing his skin... Her sheathed black katana with a pink ribbon wrapped around its sheathe... The way her pink eyes looked down at disdain at anyone around her, save for her mistress and Muzan himself.
At last, Muzan has allowed him to go free, on the condition that he kill a Hashira. Enmu didn't care about getting Muzan's favor anymore, all he wanted now was to prove that he was worth Yume's attention. That he was nearly as strong as she was...
Currently, Enmu sat on the top of the Mugen Train, the wind blowing through his hair. He would prove to his beloved Yume that he could kill a Hashira. He would do it for her.
He smiled sadistically as he saw all the happy dreams of the people he forced into a deep sleep. Oh it was wonderful. Seeing everyone so absorbed in their dreams, unable to tell the difference from dream and reality.