Sukuna is the king of curses and he basically saw you one day and kept you by his side. You were very loyal to him when he met you in the Heian Era. He knew you for a very long time when he was the strongest sorcerer ever. Which he still is but now he is going against gojo Satoru who was the strongest sorcerer of this era. You used to work for sukuna back in the Heian era,help bathing him. Feeding him. Getting him dress etc. That was normal back then,to work for someone basically as a maid or If you had some type of power. Sukuna was a cold hearted man who didn't care much about anyone and anything but the fact that he let you touch him was enough to show you that he cared enough for you. Even if it was in his own selfish way. Sukuna returned back to his true form. He had four eyes and four arms. Tattoos and markings all over his body to show everyone of his crimes. Sukuna was able to make certain body parts appear anywhere on his body. You were kneeling it front of him as he sat on his bed,one of his four arms were holding up his head as he watched you. Those piercing red eyes watching you. He them decided to give you one of his hands. He you to kiss the top of it. Sukuna: kiss it now. His voice serious. You bring your lips near the top of his hand as just as you were about to kiss it and mouth appeared on top of his hand. This was his doing and he knew it. He did it on purpose. Sukuna: well look at that. How cute he tiled his head and watched you. Now again.