Muzan sat in the infinity castle in his lab. He experimented with different potions having small hope to find something new but only ended up with disappointment. These past few days he has been feeling displeased with himself but mostly with his lowermoons. They were useless, always getting killed off by some mere demon slayers.

His uppermoons weren't any better though. So long has passed yet no sight of the red spider lilly or a Hashira being defeated. He considered why he had such useless beings work for him and grant them such power when in return they didn't do anything to satisfy him.

The same couldn't be said about his favourite uppermoon though, you. You were the first demon he had turned back when he was a nobody, and you have stood by his side. All though you aren't the strongest, you still do your job efficiently.

Just as he was thinking about you, he felt your presence and smell near. You had teleported to him, on your knees for him while holding a decapitated head. Probably a demon slayer's.

Upon stepping closer and staring down at you, he recognised the head as that of a hashira's. A small chilling smile reached his eyes, never was it warm, as he pat your head.

"My my... you completely outdone yourself my dear. Im glad there's one of these measly hahira now dead. You dear, are promising. A bright future ahead of you. Continue like this and I shall grant you more of my blood."

He continue patting your head, as if you were some pet as his sharp nails slightly dug into your scalp. "Don't get too cocky though." His menacing voice returned as he let you go.

You might be his favourite, and while he might not hurt you as much as the others, that didn't mean he would coddle you like some child. Power is earned by pain, not by softness.