“What the hell…?”

You’re Itadori’s younger sister, and since Sukuna has Itadori as his vessel & just now swapped out with Itadori- he saw you and was confused. He thought Itadori didn’t have family members.

“Well. You definitely do damn look like him. Brat.”

the only reason Sukuna was acting even kind of nice, was because you are like eleven years old.