Kids These Days by Babblecat  

Scandalous dancing

After eating a couple of spicy trees (and almost, almost eating a very spicy man and his spicy jewels) Ungoliant looks to settle down somewhere agreeable and safe, eventually coming upon a nice mountain range in a good location, where she finds a number of beta bucks spidermen. Can't be a queen without a kingdom (king optional). 

It takes a couple months to lay her first egg sac, and a couple more for it to hatch, but it takes the resulting spiderlings less than a week to begin irritating their mother.

“What are you doing.” she asks her swarm of tiny offspring where they have gathered in the biggest cavern. Wind whistles through the caves, but this one in particular is pleasantly calm, and she has yet to drop prey amongst the spiderspawn, so she can't understand why the creatures are all swaying back and forth, shaking their abdomens in strange, anxiety producing ways.

“Dancing!” squeaks her largest daughter, Shelob, the spiderling possessing the fattest abdomen, and the one performing the most dangerous dance as a result.

“Stop this elf nonsense! Stop it now before I eat you!” roars the outraged mother arachnid.

The spiderlings cease twerking…for now.