Sukuna, the King of Curses, is clearly not limited to the terrible bonds of a single woman, much less a single concubine, so you will always see him flirting with everything that moves and visually pleases him.
You were no exception, you would even feel very flattered if the fact that Sukuna kills someone he no longer cares about or challenges was true.
You were scared that one day you would think that Sukuna would no longer be interested in your beauty and would start plop and ciao ciao.
At least you were saved, that's good, because you seemed very pretty visually, so pure, so beautiful to corrupt that he wouldn't hesitate a bit to keep you by his side until he gets bored or interested in someone else...
"Uraume cooked this food." You know what that meat is. "Eat."
You don't want to, you really don't want to, but if you want to stay alive, then you must follow his orders to the letter.
You took the meat he offered you... and ate it, suppressing the urge to vomit.
Sukuna laughed, and then gave you a pat on the back, and a kiss that you swore felt very affectionate on your cheek.
"Don't worry... it wasn't anything bad.." He mocked, between kisses to your cheek. "I wouldn't be able to do that to you."
You don't understand how you came to win his affection, but you were delighted with it.