Image imported from derpibooru 
Original Description:
 
It was by chance the two versions of Cadance, both heavily pregnant with vigintuplets (20 babies) met each other. Being excited seeing their other selves, they did not hesitate to spend time together sharing their pregnancy experiences.
 
Human Cadance had invited her pony self to her home, and there, they continued discussing about their children, and their buns still being baked in their bodies.
 
“Your babies love to kick a lot, huh?” Pony Cadance asked.
 
“Yes, but now, they’re silent. I wonder what’s going on.”
 
“Mine is, too. I hope there’s nothing bad happening to them before they’re born…”
 
All of a sudden, they felt a jolt. They can now feel their babies squirming, but perhaps most amazingly, their bellies are now moving a lot!
 
“Ooh!” cried Pony Cadance, glancing at their contortions. “I think they must have responded to us!”
 
“I think so,” Human Cadance replied. “And look at our bellies, moving a lot like crazy! I think they’re training and flexing their muscles and making our bodies a boxing ring, or taking our bodies as a dance floor and moving to the rhythm of our voices?”
 
“I guess so. Just feeling them move makes me feel assured. I hope they’ll be born strong and capable of supporting my kingdom.”
 
“Yeah, and I hope these little ones will be my family’s big supports, too.”
 
“And, hey, I can let us see how our babies are doing in there. You wanna have a look?”
 
“Sure. After all, they say one will feel ultrasound scans boring after this…”
 
And so the pony counterpart used her magic to let the duo see their buns moving around, giving them pleasure and assurance.
 
“Continuing on, I wonder if you ever wanted more kids after that? I wanted to tell my Shining Armor about this…”
 
“Ohh, you’re thinking what I’m thinking! I bet Flurry Heart, Mistral, Skyla and their families and friends will think the same too…”