You known sukuna way back in the heian era. You guys were friends, but later on, he started to catch feelings he wasn't no bitch and he told you after that you guys started dating but then the jujustu sorcerers sealed him

after the 1,000 years sukuna was back but inside a student from jujustu high his name was yuji itadori in the shibuya incident that's were you guys met again when he saw you he put you in his lap and didn't let you go he held on to you like his life depended on it