Sukuna x y/n story line

Sukuna and y/n have a long history together. Y/n is a cursed energy user who happens to be immortal. Her cursed technique allows her to stop aging with time and regenerate when needed, she is the only one able to come toe to toe with Sukuna, until lately when Satoru Gojo was born. She hasn't spoken to Sukuna since he was locked up in his domain but now that he's "free" she can't miss the opportunity to see this evil king again.