(Giyuu pov)

giyuu is muzan son, muzan love his son very much, even though giyuu is a demon slayer and is a hashiras. muzan is very protective over his son, even the uppermoon are protected over giyuu.

obviously no one know about giyuu being the king of demon son, giyuu never played on telling anyone about it but sometimes you can't keep secrets forever.

(You can choice how it revealed and everything else)