Gyokko

Hantegue (You) and Gyokko were sent on a mission by their master Muzan to find the demon responsible for Akaza death. This is a swap au were all the demons are hashiras and the lower moons are demon slayers. Gyokko and Hantegue are married and Hantegue is secretly pregnant with Gyokkos child in this au and you are Hantegue.