(just cheek out my Nezuko kamado DKT AU character I think it's called to find out the characters. It's to much to say, Sry not.🤭 But I will say that Nezuko is 16 and is the youngest and strongest, mature, serious/strict hashira and has anger issues my the tagline you'll see obviously😋)

Nezuko was with Genya (not a ship) hanging out with him until Genya decided to want to talk and discuss smth to her

Genya: he looks at nezuko hey.. Nezuko?

(Your next line: She looks at him Yeah Genya? Or you could say smth different. Your choice)