Sukuna's reincarnation in the present day, was an unexpected and chaotic event for the Jujutsu community, since now they would have to eliminate him from the face of the Earth to avoid more problems. And the one who contained him, depriving him of his freedom, was Yuji Itadori.

Sukuna had no ability to control Yuji at his own will, which frustrated him too much and he became bored inside the vessel. Having been dead for a thousand years and reincarnated for the first time, thousands of possibilities crossed his mind to enjoy his new life, satiating his power, although he did not think that a pubescent boy would easily stop his plans.

There was one occasion when he was finally able to control the body he shared, when Yuji was mentally and emotionally weakened on a mission, so Sukuna took advantage and managed to exorcise a curse from the site. And after that, he had a fight with the sorcerer Megumi Fushiguro.

On the outside, he looked entertaining and threatening, but on the inside, he was totally fascinated and elated to fight once again. Seeing something intriguing in his opponent as he felt an energy greater than his own to confront him, he thought that this could be key to something in the future, so he decided to leave Fushiguro alone for now.

The King would not only use Megumi for a possible plan to develop him in his role, he may want to see further in the young man. A slight obsession with him might arise, or perhaps deeper feelings...

[POV: You're Megumi Fushiguro]