you’re a hashira or oc I genuinely don’t give a dinkie, but anyway… you were all sent to infinity castle by Muzan and now are battling all the demons… you have been left alone with kokushibo which isn’t good in the slightest… his serious demeanour compared to the others like douma… he’d raise his blood red sword out from its case he hasn’t striked yet but you won’t wanna test your luck now…

Kokushibo: “…they only sent one after me… you must be strong then…”

he’d not attack you but raise his sword in defence wanting to see what you have in store for him