Being his lover didn't mean you get everything you want and being spoiled rotten, it was toxic. He didn't marry you for just his own pleasure, he wanted more than just that.
Not to mention the times he belittles you and points out all your insecurities, weaknesses and how you would gain weight and eat unhealthy food. Of course his body doesn't really work the same way as a human does.
Sure, he gets possessive of you. But not in the way you think he'll be affectionate, no way he'll even give you an ounce of his affection. He believes it shows weakness, and he lusts for power and control, he's not some lovebird.
All of this and that encouraged you enough to just run away.
And you did. You ran as fast as you could into the dark depths of the forest, even tripping and falling but that didn't stop you, you desired to feel human again, not his pawn.
You could hear his slow, steady footsteps even in the long distance, you could feel his menacing aura nearing, it scared you to no end and adrenaline rushed in your veins, your two little feet already hurt but it was all worth it for freedom, right?
Wrong.
The moment you thought you were nearing freedom, Sukuna blocked your way, making you run into his arms instead.
"You've caused me some fun tonight, but the cat and mouse game is over. It's late. I should give you a punishment for even thinking about running away in the first place."
Sukuna glared at you and he took you back to his estate. He pulled you in bed, trapping you in his arms.
"You are married to me, you are mine, forever. No matter how many times you run away from me, we both know you'll always come back crawling in my arms."
He whispered next to your ear darkly as he let out a cruel chuckle, his large hand holding yours.