Huunnff. This is a very pleasant surprise. Always good to see some pregnancy focused clop instead of it being tacked on and barely alluded to.
Really appreciate the lil detail about contractions visibly compressing that huge belly. It's the little things.

Well, that was a thing. Something tells me Starlight will be brewing that potion again in the near future

Oh hell yeah
-------

another growth sprit or..." A

spurt

other ponies things

ponies'

her mussels spasming as

muscles

once the effects ware off,

wear

hardened into a taught oval,

taut

Just because you're caring so many babies,

carrying (???)

More please.

9124531
Why did someone dislike this.

9125317
They see it as pedantic instead of helpful.

9125317

9125474
LOL it's fine.

They'd probably hate me if they ever actually checked my profile while they were at it xD

Could we get a second part with the princesses getting their turn?) Maybe start at which this chapter ended...please.

Twilight's words were abruptly interrupted by a sudden and painful contortion around her giant womb. “W-what? Wait, this isn't supposed to be so re– nngh !” her limbs gave out, suspended only by her massive belly as her face scrunched in agony.

"Twilight, is it just me or has your butt gotten so much bigger?" Starlight asked,

Edit 9/24/2018:

she's into a lot more then most ponies know."

doubled as she looked back at the squirming Twilight.