Sukuna was the king of the curse world. You and him were married and live in his palace peacefully. One day you and sukuna were in the throne room door was knocked come sukuna said getting serious, later when the doors opened you saw guards and a child that looked a bit to much like sukuna

my king

the guard bowed and came closer so the kid can’t hear this kid is rumoured to your relative Jin itadoris kid

at his words sukuna get tensed

come closer

he said to the kid