Less than a second after Pinkie rang the bell Cake Foal 1 lunged forward and body-slammed into her gut, causing both Pie Foals to stumble back. They quickly recovered and Pie Foal 1 bucked Cake Foal 1 square in the muzzle. While his sister recovered, Cake Foal 2 head butted Pie Foal 1, stunning her, only to be pushed back by Pie Foal 2. Cake Foal 1 got up, wiped the blood off her muzzle and delivered a roundhouse kick to Pie Foal 2’s head, sending her crashing into Pinkie Pie’s rib cage.

***

“D’OH!”

***

Pie Foal 1 shook her head and focused. She noticed her sister on the floor next to her and looked up to see the smug look on Cake Foal 1’s face. Then she saw Cake Foal 2 join in on his sister, which only made Pie Foal 1 angrier. She crouched down and leaned forward. The Cake Foals were prepared for a tackle but were caught off-guard when Pie Foal 1 landed in front of them on her hind legs, her forelegs stretched out behind her.

Not a moment sooner did Pie Foal 1 swing her front hooves from behind her to deliver a double uppercut to both the Cake Foals’ chins, sending them skyrocketing into the roof of their mother’s womb, causing to swing upwards and smack Cup Cake in the face.

***

“OOF!”

***

As the Cake Foals began to fall a figure ran past Pie Foal 1. Pie Foal 2 had seen that last move and wanted to compliment on her sister’s work. Just before their opponents hit the floor Pie Foal 2 jumped up, spun around, and spread her hind legs in order to kick both the Cake Foals back, into their mother’s stomach and knocking the air out of her.

***

“AHH-OW!”

***

The Cake Foals tried to regain their balance but their mother’s coughing made it hard to stay upright. They looked to see the Pie Foals laughing at them, infuriating Cake Foal 2. He charged forward and rammed his head into Pie Foal 1, making her stumble backwards onto Pinkie Pie’s bladder.

***

”Oooowwwwww! Maybe this wasn’t such a good idea.”

*Coff...Coff* “You think?!”

***

Pie Foal 2 looked back to her sister and saw she was alright. She turned back to retaliate but was rewarded with a loud *CRACK* and a painful stinging in her nose.

***

“HNNNG! What are they doing in there?!”

“I don’t know, but that mysterious CRACK set my oven on fire! I hope my bun-buns don’t burn!

***

Pie Foal 2 fell back to avoid another one of whatever that was. She felt blood coming out her nostrils and glanced up to see what caused it. Cake Foal 1 was holding her own umbilical cord and twirling it in the air like a cowpony about to crack... a... whip...

THAT’S IT!

Pie Foal 2 had to think of a way to end this, and fast. Cake Foal 1 was still standing there, waiting for her to come closer. Pie Foal 2 looked behind herself and saw she was standing next to wall. The same wall she pushed out on earlier to see how stretchy it was. She would be coming closer like her adversary was hoping, but not without a little... thrust.

With an evil grin Pie Foal 2 scrambled backwards frantically into the wall, stretching it back with all her might.

***

As she watched the left side of her belly stretch back in an unnatural way, it was at this moment that Pinkie Pie knew she bucked up. “Uh-oh...”

***

Pie Foal 2 looked to see Cake Foal 1 was looking back at her, confused. However the confusion turned to horror when she figured out what she planned. Cake Foal 1 coiled up her umbilical cord and made a dash for it.

Too little too late.

Pie Foal 2 pulled her hind legs up flung herself forward like a missile. She shot right into Cake Foal 1 and sent her flying to the other side of the ring. Pie Foal 2’s victory didn’t last long when she felt a painful tug on her abdomen. She looked down and saw her own umbilical cord stretched taut. She realized her error and gulped, knowing what would happen next.

The rubber-like connection between her and her mother flung Pie Foal 2 Back where Pie Foal 1 was beginning to get up off the large squishy sack she landed on. The unsuspecting fetus had hardly any time to look up before her womb-mate slammed back into her and landing on the squishy sack once more.

In the same timespan Cake Foal 1 was sent flying back from Pie Foal 2’s slingshot maneuver. Cake Foal 2, who kept his eye on Pie Foal 1 to she if she started moving again, saw what happened but was also too late to avoid the twin missile. They flew back and landed on a liquid-filled sack identical to the one the Pie Twins landed on.

Neither set of twins were given any time to recover when they heard a frantic-

DINGDINGDINGDINGDINGDINGDING!

A millisecond later the Pie twins’ battleground-turned sanctuary jerked up and turned over, sending them tumbling as the whole womb shook with frantic movement. The (second) Cake twins didn’t fair better as they were shaken around like maracas.

***

Pinkie Pie and Cup Cake practically launched themselves out their chairs when nature began to call massive overtime. They tripped over their own and each others’ hooves in the attempt of being the first to reach a bathroom. They jammed themselves in the public bathroom door, bellies squeezing against the doorframe and each other. The two mares struggled and began to shout like little children about which one was first.

In the end, Pinkie Pie got through first when she lost patience and drove her hooves into the floorboards and heaved herself through. After being shoved out and narrowly avoiding a door to the face, Cup Cake made a run for the stairs, desperately trying to hold it in a little longer until she reached the private bathroom.

By some merciful stroke of luck and/or fate she made it just in time.

About five minutes later both mares rendezvoused back in the living room. No words were exchanged as Pinkie Pie and Cup Cake put away the mini-boxing ring and returned the chairs to their former position, respectively. Once that was done, with their foals finally seemed to calm down, they called it a night and returned upstairs.

Author's Note

Some of you might be wondering before or after which season does this take place. In all honesty, I don’t know. What I do know is it takes place after Season 3’s finale.