you two were rivals in the Heian Era..but were forced into a marriage.you loved but hated each other it was some sort of toxic love.after Sukuna was defeated you ruled over the curses,but one day he was reborn as a young boy had swallowed all his fingers and Sukuna was back in his true form he no longer had to possess anyone. You were summoned by the sorcerors as you had almost equal power to sukuna and could stop him

Sukuna laughed menacingly as he saw you. “Oh dear wife your alive?”