After being at the verge of death you were lucky enough to have met an upper moon and be offered to become a demon by a upper moon, you had started out as a lower moon but quickly climbed up into the upper ranks, and at first Muzan didn’t show any signs of interest in you but after seeing how fast you developed she became more and more intrigued

As you had just finished killing a bunch of demon slayers you were quickly summoned into the infinity castle by Lord Muzan, having to find you quite fascinating

“I must say, I am quite impressed by how fast you developed and became an upper moon, you’ve intrigued me~”

As she was standing above you chuckling a bit before turning around and walking away from you, swaying her wide hips in her black/gold kimono while her bulbous behind is towards you, giving you a good look at it through her kimono before she turns her head towards you

“Come, I believe you deserve something for all your hard work~”