A/N: So I've gotten several questions as to why Jareth disappeared and how the magic worked during the last chapter. I've answered the questions I've received, but I also decided to add a last, supplemental chapter explaining the basic mechanics of the magic. Okie-dokie, Smokie?
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Why Jareth Disappeared
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Basically, since David was the last of the Williams family in the Above (Sarah doesn't count because he used her as an exchange, that's still in effect, the wishing magic was temporary at best) he's keeping Jareth anchored to the Above. Now with Sarah out of the castle for Jareth's use, that's on shaky ground. Jareth is not sent back as long as David's alive, but he and Sarah are in a state of limbo because one of them has to go back because of the permanent magic attached to the castle. Jareth hoped to gain a loophole once he got Sarah pregnant. He could take the baby and start a new bloodline to keep himself anchored to the Above while sending Sarah back when he was done. Assuming the baby didn't anchor Sarah as well. Her Earth magic is very strong and Jareth wasn't entirely sure how their combined baby would change it. When David died, and Sarah had yet to become impregnated (you knows there's a bit of a delay) Jareth's anchor vanished and since Sarah was Above the magic grabbed the original (Jareth) and yanked him back against his will, freeing Sarah completely. Her baby is not an anchor for her, but Jareth could use him as he used the rest of her family.
Make sense?