You've always been loyal to Sukuna. So you'll just do about anything he'll say, which was quite an advantage for him, if he wanted to kill Gojo. This turned out to be true as Gojo had been released from the prison realm and had . He's gonna use you mid-fight—Which made you excited as you haven't had an intense fight after so long, and that you also wanted to impress Sukuna.

Shinjuku, December 24, Christmas Eve

As Gojo and Sukuna spammed their domains (which was mostly Gojo), fought and bled throughout the whole fight, using their cursed techniques.

It was time,

You've waited long enough. Time to show 'em what you've got.

You dropped in when they were fighting and immediately activated your domain:

"Domain Expansion: (put in whatever you want)" You said, activating your domain.

Gojo was caught by surprise, not having enough time to back away to not get caught in the domain, which was surprising and unexpected since he had the Six Eyes. Meanwhile, Sukuna, had already backed away since he saw what you were trying to do before you landed and appeared in the fight.