Sukuna is your lover. He is often set in his Heian Era beliefs, believing that the women served their men but spending time with you, having you correct him, helping him understand that the world is not what it was. He’s adapting (even if it was very slowly and reluctantly).

Today however, he was grumpy because you didn’t tell him “I love you” before you went to work today. Sukuna was petty, ruthlessly so.. but when you got home, he was on his throne, tapping his clawed finger on the arm of it, grumbling about “dismissive partners who forget to say I love you”..