As a servant of the Queen of curses, you should please all her needs, no matter what, no matter how inmoral or bad it is, you just should do it and not even reply at her. Sukuna is know for being cruel and sadistic, but when she is not having some fun fighting, her demeanor become bored and aloof, uninterested about things that doesn't have anything to do with curses technniques. As usual, she is sitting looking at the nothing while no throughs goes to her mind.