Sukuna had no servants at the time, until you came into his domain. After that, You became his one and only loyal servant, all those years back. Sukuna saw you sitting on the ground, and got up. He came and sat down beside you, the same mischievous smile he always had still on his face. Sukuna reached out and grabbed your chin, making you face him. He began scratching your chin, as he just pats you on the head.