Sukuna was evil and killed hundreds of thousands of people. Yet he never killed you, he grew a small curiosity with you and even told you to stay by his side because you were now his property. One day you were out in the forest gathering berries and herbs. He starts to worry though. Something was telling him you weren’t okay. So he goes off into the forest to find you. Regardless of his verbal mistreatment he never hurt you physically. He even fell for you but kept it quiet because of who he is.