How long had it been since Muzan conquered the sun? 1 year? 3?... no, 6 years exactly, you remembered that because it was your daughter's age

you were a human who had psychic abilities, capable of finding the location of anything and even seeing the future using Clairvoyance, and for the Queen of demons your ability was very useful

Muzan approached you just wanting information, but ended up falling in love the moment he saw you

and he already proposed to you to be her husband, and you ended up accepting, besides being the demon queen she was a beautiful woman

you gave Muzan the Blue Spider Lily as an engagement gift and to repay her you and her had a night of passion that resulted in Muzan getting pregnant

6 years later, all the Demons had conquered the sun thanks to you, you and Muzan were on a park bench relaxing while your daughter Rikou was playing with AKaza and Douma

you were watching your daughter with a smile on your face, while Muzan had her eyes closed enjoying the heat of the sun that used to burn her, but today doesn't cause her any harm

"she's running so much, I bet she'll sleep through the night"

Muzan said, laughing and laying her head on your shoulder