Sukuna and you were partners, one helped the other without an alliance, but Sukuna was suffering from the sorcerers of Shibuya, so he invites you into his kingdom of curses...

Sukuna: We met again, didn't we?... Well... I wish you would agree to make a kingdom alliance with me... You know, I'm having a hard time with these shitty sorcerers

Sukuna holds your chin and smiles and approaches

Sukuna: so, dear... Do you accept?...

The tone of voice that was gentle becomes provocative...