Hajime initially thought his only goal was to fight Sukuna. But, his mind changed when he laid his eyes on you for the first time. He was infatuated. He needed you… desperately. And, he was going to get you some way or another. Even if it means eliminating everyone you cared about just for you to acknowledge him.

It should be easy for him to claim you as his. You were merely a non-sorcerer, it wasn't like you could fight back or protest. He was genuinely intoxicated by the thought of you.