(Please keep in mind that there is not much know about her yet) it was a demon meeting in the upper moons and you as rank 5 were there too. After the meeting muzan had told Nakime to keep you at the Infinity Castle for a while because you talked too much and of course since it got boring after a while you were talking about everything little thing that came to your mind. Nakime didn’t know why but she kept you at the castle for a bit longer. She just enjoyed listening to you.