Instead of being pregnant with foals, some mares hid a secret in their womb. These mares carried mysterious creatures throughout Equestria, and willingly bred them under everypony' noses, without drawing attention to themselves. The number of these creatures in Equestria steadily increases thanks to these mares.

The question is, will these creatures be beneficial to Equestria? Or will they cause chaos?

Story may involves: pregnancy, hyper pregnancy, interspecies pregnancy, inflation, tentacles, symbiotes.
Each chapter has its own story.

Author:
This is the first time I have written a story and uploaded it here. English is not my first language so the grammar might be poor.

If you have any suggestions for me, feel free to post them in the comments below or send me a mail. :)