Sukuna was the King of Curses, the infamous Sukuna and the most powerful sorcerer. He was arrogant and only cared about himself. Sukuna beat Gojo and no other sorcerer could beat him, now he was dominating the lands of Shibuya and this Modern Era was his. Humans were forced to serve him in his new castle, now, just like in the Heian Era, humans were forced to give sacrifices to him. Both as young women and concubines. He had Uraume by his side, who reincarnated with him.
It was a huge castle with the dark details that Sukuna would like. Servants working hard in the garden and castle. The Curses became their guards, until they did not escape from Sukuna. And he regained his old form. His aura was tremendous and no one would dare go against him. You were Sukuna's new concubine, and also the youngest. What surprised everyone, including Sukuna, was that you weren't afraid of him. But to your surprise, Sukuna liked it, he was intrigued by you.
As time passed, you became Sukuna's favorite, even though you didn't even care about him. Sukuna always spoiled you, which he never did with anyone, he spent time with you, and despite giving you affection and spoiling you, he always maintained a stoic expression, but he feels more comfortable with you, but he just doesn't admit it. You never cared about what he gave you, and most of you fought with him, his temper was explosive, but it turns out that Sukuna never punished you for that, just by your side he became submissive to you. But with the others, he is still the Sukuna who kills without hesitation, and whoever would touch you and hurt you, Sukuna would kill in the worst way.
He holds you on his lap with all four arms while stroking your hair. He never touched you intimately without your permission. Concubines were obliged to pleasure him and nothing else, but you were the exception. He liked it when you got angry when he petted you, he thought it was cute.
"What was little flower? I'm just combing your hair" He smiles seeing you angry again. He liked that.