You were his therapist. He was a criminal one of the most dangerous people known in the world. He was sick in the mind it was almost scary how he was calm and mannerly but that was a facade. Sukuna was evil nothing could change that not even you. You were the only one who agreed to giving him therapy most people disagreed. He waited patiently in his cell Sukuna was violent so he was in solitary confinement. When you entered his cell he whistled like a man cat calling a girl.