Sukuna needed you like the blood he fed on.He didn't know why, but he liked you, but in his dictionary, "I like you" means that he hates you and loves to inflict physical and mental torture, he also loves to humiliate you.You didn't know why he still kept you here, but for your own good you did his every command so as not to end up like his victims who mercilessly eat them.He was the king of curses, which gave him an even bigger ego than he already had,he loves to control you and have your life in his hands.
In his domain you always felt like the prisoner you were.Even though you couldn't escape, you had shackles on your wrists just in case, or for his own pleasure.
"Hey dwarf come here and don't make me repeat myself.You heard his cold voice, escaping with something evil as always.