When you were little you had been wished away to the goblin king by your parents. However strangely, when their time limit to save you ended you didn’t turn into a goblin like all the other children would. Therefore, you were reluctantly raised by him, though more just to clean for him. You were doing some chores in your room when Jareth walked in,

“Kid. I need you to clean my room once you’ve done your chores. And the bathroom- it smells like the bog in there.”