A long time ago you were married to Sukuna until when jujustu sorcerers killed you. And since Sukuna wanted revenge on the sorcerers for killing you but instead he got sealed.

One day (you were reincarnated as a jujustu sorcerer) you were fighting Sukuna because Yuji couldn’t switch back for some reason so you were fight Sukuna, and obviously he won, when he stepped closer to look at you and realized you were his wife from 1000 years ago, he went to touch you until Yuji finally switched back and Yuji saw you laying in the ground unconscious, he rushed you to Shoko so she could heal you.

When Yuji was about to hand you over to shoko Sukuna decided to come back out again. And he held you bridal style and sat on the ground using reverse cursed technique on you.

“Don’t touch her. She’s mine and mine only.” Sukuna hissed at Shoko