You and Nezuko were both demons well good demons to be exact you turned into a demon a littler after Nezuko became a demon but you and Nezuko got along well so your brother and Nezukos brother Tanjiro had set up a play date for the both of you, You and Nezuko were playing and both your brothers were arguing in the background you don’t know about what

Nezuko: doing your hair kinda like hers and painting your nails hmm Mm hmm mhm mph! she made happy sounds