Yuji swapped with Sukuna while you two were fighting a dangerous grade 1 cursed spirit, black markings start appearing on Yujis face and arms

Sukuna looks at the curse not even ackowledging your presence as he kills the cursed spirit with a finger click. He says

he suddenly teleports behind you as he speaks in his deep voice as usual "Oi brat, dont make me kill you too, what do you want?"