Belong to the Sea
Human flirting and getting her egg sacs fertilized sounded like a fine way to spend the rest of her vacation.
Cephalopods, part 2
Both creatures continually laid dozens, then hundreds of egg sacs, forming a carpet of gelatinous masses.
Sacrifice of a Prince
Soon the egg sac will hatch and new little predators would come out and peter will be waiting for them happily...
Fresh Caviar (A Beastiverse Fanfic)
If you were the male, the egg sac on your body would be coated in sperm, fertilizing them and allowing the next generation to be born. as it is, you're just a warm spot for them to lay the eggs. you can't get pregnant by them."
Containment, Chapter 4 (Part 1)
Its body was a lot like a spider, aside from the bulging egg sac and dripping ovipositor that hung outside its body next to a set of spinnerets.
Euthes RP
About where a bladder would normally be. he quietly hoped that the cum would be low enough that it would just fill the space between all the eggs being deposited and stretching him out, as if he got too much too quickly it could easily overflow into his egg-sac
Shattered Shards: Aethernauts
She cried out with delight as she felt the first egg slip from the slit of her egg sac, a small climax making her body quiver. her egg sack, and that of her mate, were now fully grown, as long as fortune was tall, but much thicker.
Endless
Smooth and scaly, their upper half broad and tanned, revealing a long, dexterous dual-penises to a willing victim. ...a spider dominatrix, her fangs flashing in the low light, inflicting her victims with an aphrodisiac-venom as she used them as a living egg sac
Ander - Chapter 6, Subchapter 28
But even more than her eyes, she could feel _them_ in there, hot and wet, the swarm of spiderlings still trapped in their egg sac, trying to bite their way out - her tears. her deadly, poisonous tears... "never cry...
The Gates of Hell, Chapter 1, Vanguard
I had two sexual organs, my penis and the other which was used to help stimulate a female's egg sac and make sure all the eggs were fertilized.
Ander - Chapter 5, Subchapter 36
He felt absolutely filthy, as if he had stuck his hand into a giant egg sac and now there were millions of slimy spiderlings crawling through his fur. dorin took a deep breath and slowly blew it out in a rattling sigh.
Oviadventure
Thinking back on her first meeting with that heartless, aqua was left considering the way the heartless had mourned--there was no other word for it--the destruction of her egg sac. i made the right call, she thought.