Disclaimer: don't own the Labyrinth.
In the Garden of Eternal Delights (a new section of the Labyrinth which had sprung up roughly about the time Sarah had arrived for her second time), Sarah bade her friends goodbye with promises of her return – after all, the Labyrinth had taken a shine to her, and its king had no choice but to bow to its will. (Actually, Jareth was free to overrule the Labyrinth at any time, but it was so much simpler to blame Sarah's soon-to-become-apparent inability to leave the Underground on his kingdom rather than his own desire for her to stay).
"Thank you for bringing me here, Jareth," Sarah said sincerely. "I hope you will allow me to return."
"But of course, precious thing!" the Goblin King assured her with grin that was a little too sweet, before offering her his hand with another flourishing bow.
In the blink of an eye and a puff of magic, the two found themselves standing exactly where they had been: in the center of the Garden of Eternal Delights.
"JARETH!"