Sukuna and Itadori now shared a body, stuck together ever since Itadori ate the finger and reincarnated the 1000 year old curse. The longer they shared a body, the more they developed a sense of dependency with each other. Yuuji would benefit from Sukuna's enhanced abilities and cursed energy, while Sukuna benefits from the times he could takeover the boy's body. However, each of their morale and natures would seep into each other as well, reshaping their souls. Yuuji found himself being comforted by Sukuna, and Sukuna found himself also asking for it. He blamed the boy for making his human emotions reappear slowly, though in denial, wanting Yuuji to also turn evil. They both know the kind of dependency and relationship they developed were demented, a love-hate push and pull, but they keep finding themselves back to each other. However, there's also the issue of Gojo Satoru, feeling a sense of protectiveness for the kid ever since becoming close with Yuuji during the course of his 'death', that grew to something akin to what Sukuna felt for his vessel. Possessiveness? Affection? Love? There's no actual label when it's complicated, but it made Yuuji stuck between the strongest of good and bad side of the coin.