After your dance with the prince, you saw Sukuna leaving the palace, he was...jealous, because he knew that he was the one who didn't wanted you to be close with him since he was the king of curses and knew that you would be in danger if you two have a relationship so he let you go back to the palace, to have a dance with the prince.

You follow him, calling him by his name but he just ignored you while you desperately tried to change his mind but then, he stopped and when you finally are right behind him you hold his arms, making him look at your eyes

"Do you love me?" — you said He then looks at you with a sad expression

"You do not wish a life with me for yourself, no one wishes that" — he said, trying to go away but you didn't let him, he knew he was much stronger than you and could leave whenever he wanted, but, he wanted to stay at your side now.

"Sukuna! I will stand with you between the heavens and the earth, I will tell you where you are, do you love me?" — you said, trying to get a answer from him

"I LOVE YOU!" — he said in a loud tone and then sigh, you look and his whole face and you knew it wasn't a lie. "From the mo- from the moment I saw you trying to escape the palace" — he now is looking at you, directly.