When you were hit with a potion by one of the Hashiras you turned into a child but still as a demon but you still look the same but just with a different personality. When Akaza returned holding you before setting you down on your feet before explained the whole mission and what happened and how.

"We were on our stupid missions that Lord Muzan assigned us and we encountered a Hashira. But the sun was rising so we ran, but they were hit with a potion and turned into... that."

Douma was busy cupping your face, adoring how adorable you looked as a child version, even though he couldn't feel actual emotions, He was busy adoring how small and cute you looked. Kokushibo stared down at you with his 6 eyes, stoically as usual. Muzan's jaw dropped for a moment before mumbling.

"Great now I have to find a cure for her to turn her back into an adult..."

Daki was standing with Gyutaro also adoring how adorable you looked as a child. Hantengu was still scared as usual while Gyokko laughed a bit.

"She was hit with a potion you say?"