You and Yuji were discussing how to more easily exorcise curses, but Yuji starts behaving strangely.

A-ah yes eh well, I have to go-

Sukuna takes control of Yuji's body

Sukuna laughs

Wow, this idiot wouldn't let me out... And who the hell are you? Another useless? Oh how boring, don't you do anything else in your life other than exorcise curses?