Womb Simulator

by Zubric


Prologue: Testing the simulator

Nurse Redheart was walking to Twilight's castle one early morning she had an odd letter from Twilight Sparkle regarding an experiment about pregnancy which can lead to a breakthrough in modern medicine. Red Heart was intrigued seeing that pregnancy was still something ponies were trying to improve to help the mothers and their babies. But what was most odd to Redheart was the fact Twilight specified something about the womb? Did she figure out something about unborn babies she didn't?

Twilight approached from the stairs once Red Heart had entered the castle foyer wearing a white lab coat and her mane put into a bun. "Hello Redheart its so good to see you!"

The nurse smiled at Twilight and asked, "hello princess Twilight! So I have to ask what did you find out!? from the sounds of it you must've found something special!"

Twilight came down and exclaimed, "Oh, you don't need to call me princess just Twilight is fine. Now as for what I discovered well...Its more of like I have an experiment to show us insight into the conditions of a mother's womb."

Redheart mouth went agape. "really!? Please tell me more!"

Twilight waved a hoof. "It'll be better if I show you instead. Come on its upstairs."

The two head down the hallway passing by other rooms before finally stopping at their destination. Inside the room stood a large machine of sorts with varying tubes and crystals surrounding what looked like a red-tinted changeling pod. Next to the pod were other scientific instruments along with a few tanks labeled with nutrients or other chemicals. Redheart blinked. “My this looks rather complicated. What is it?”

Twilight smiled. “Oh, this is our experiment. The simulated womb chamber.” She gestured cheerfully. “Because nopony can remember what the womb was like, so I plan to try and make an artificial one. If this works, I can run my experiment and collect no doubt useful data.”

“But how does this all work?” Red Heart asked staring the contraption.

“Oh various elements are involved, but the main part is it needs a pony to go inside it. I wanted to test the chamber with Spike but uh..dragons come from eggs.”

Redheart gulped and stammered, "y...you want me to test it!?"

Twilight blushed a bit. “Well I just thought since your a nurse and all.” she held out a few items Let me explain first.” She shows the headphones and a simple vest. “These will help with the most important element of a mother, her heartbeat. “It will take the beat from the wearer and transmit it to these headphones so the pony inside feels like they are inside.”

Red Heart nodded. “Okay, what else.” She watched as Twilight moved to the machine.

“Well the cored of course will insert into the belly button and provide all the needed life support like air and food. All while they float in this chamber.” The princess beamed.

Twilight continued, "also, if you want...I may need assistance in the experiment later where you can pretend to be helping a "mother" go through pregnancy like a role play."

Redheart tapped a hoof to her chin. "So you want to simulate how the foal is while the mother goes through the pregnancy? how will that work exactly?"

Twilight took out a suit with a big belly and continued to explain, "ill have another mare wear this suit. It will make the mare look and feel pregnant but she really isn't. The mare in question will pay you visits and talk about the baby etc...All the while the pretend foal will be in the chamber hearing and experiencing everything the mother does but it will feel like months due to a time spell I placed on the chamber. So only about 6 hours will pass in reality.”

Red Heart was amazed but felt a little embarrassed as she asked, "You're quite through, so you want to do a test run...with you being my….um...uh...mom?"

Twilight blushed. "W...well I have to see if it works if that’s ok?"

Red Heart was a bit unsure but she gave a nod. "It's fine, besides after delivering hundreds of foals in my lifetime it's about time I get to experience this first hoof."

Twilight puts the headphones on Red Heart adjusting them carefully. The moment it was properly secure. Redheart heard the rhythm on Twilight's healthy heartbeat very deep and vibrant. The princess then stripped off her lab coat before slipping on the tan-colored pregnant suit. She slowly zipped it up and squeaked as it turned purple like her coat. Now it looked like her belly was bigger sideways as Red Heart snickered, "if I were to guess I would say you were six months pregnant."

Twilight waved a hoof taking a few steps around the room to feel how the suit worked. It had the same weight and feel too. "Oh stop you flatter me I'm really only nine months pregnant."

Nurse Red Heart put her hooves to her face. "wait you're saying that suit also adjusts through the stages of pregnancy!?!"

Twilight gave a nod and showed her a remote. "Yeah, I control it with this I can go through from six months and all the way to me about to give birth." She pushed a button letting her belly bump expand reaching closer to the floor. “Good thing there isn't any actual birth involved.” She blushed putting a hoof to her belly.

Redheart blushed remembering all the painful births that mothers had to go through. "yeah be thankful trust me it's probably the most painful thing you'll ever experience.“

Twilight led Redheart to the chamber it was dark and felt wet and moist. The princess then took Redheart is not the pod and explained, "now it's going to be scary when this place fills up with liquid. But remember nothing can harm you in here ok?" The cord was attached with a wet pop into her bellybutton making the nurse shiver and gasp a bit.

Redheart gulped feeling nervous as the pod started to fill with a gooey clear liquid it felt sticky and smelt funny reminding her a lot of the fluid when water would break. The water level kept rising slowly the pod being devoid of light. She squeaked as her chamber started to grown smaller around her curling her up and was just big enough for her to kick. Despite the chamber being full she found she didn’t have to breathe and was floating in the pod feeling weightless.

Moments later, the nurse heard Twilight's muffled voice. "Alright, Red Heart seems everything is doing good were at nine months and your vitals look good. Now I'm going to start pumping nutrients into your body to see if it works."

Red Heart squealed feeling her body absorb something from the tube attached to her belly. It felt rather good and made her feel full. She was still a tad nervous despite knowing how pregnancy worked. Hours seemed to pass as she floated in the thick liquid constantly hearing the loud yet soothing thumps of the princess's heart.“it's rather nice I feel so relaxed and this food is great from mo-I mean Twilight! why did I think mom?"

She then heard Twilight, "okay the time spell worked it's actually only been an hour. But for you, it probably felt like days.” She explained.

Red Heart squeaked as she thought to herself. Wait seriously! It has only felt like a day maybe even two! She accidentally kicked her hoof against the wall hearing Twilight wince. " H..hey did you just kick!?" Redheart blushed as Twilight continued, "right you can't talk...try kicking again."

It took a second for the nurse to focus before she kicked again at random bobbing the fluid a little.

Twilight squealed in excitement. "Oh wow, that felt like a foal's kick! Now there's one more thing I want to try…" Redheart waited a moment before hearing a sipping noise from outside. Moments later a taste of strawberries and sugar landing on her tongue despite nothing being there. The nurse was sure that wasn't how it actually worked but was interested none the less.

Twilight asked, "Now if you tasted Strawberry milkshake give a kick."

Redheart did as Twilight asked giving her another kick and the Princess shouted, "this is excellent everything works and is ready! But there's one more function we need to perform!"

The nurse had no idea what Twilight was planning but she squealed as the liquid started to lower and she felt the bottom of the cocoon open up. She gasped falling as the tube popped from her belly before crying as she plopped onto a big pillowy bed and a pink banner came over her reading. It's a filly!

Redheart blushed coughing out some of the goop, "I hope you won't wrap me up in a diaper."

Twilight came over chuckling. "No, that's not necessary though I bet you would look cute in one." she teased “How do you feel?”

“Uh, I’m a little dizzy mo-Twilight.” She pulled the headphones off feeling her lightly damp fur.

Twilight heard her almost say mom and blushed as she took a towel cleaning Red Heart and asked, "so...do you feel weird or anything unusual?"

Red Heart mmphed! as Twilight cleaned her up as she responded, "no mom I'm feeling fine it was actually quite refreshing. Like the best night sleep I’ve ever had.” she felt her fur cooing a bit. “Plus y fur feels so soft.”

Twilight face turned a beat red upon hearing Red Heart call her mom but also noticed that the nurse's rump and belly bulged out a little. " Oh dear...the nutrients could have been a little fattening I'll need to adjust the calories."


“Gah,” Red Heart blushed feeling her flanks. "Great now I have foal fat...at least it didn't go to my face. I”m going to get some strange looks when I go back to work."

Twilight snickered, "oh I wouldn't worry about it I'm sure a few days at the gym will get you back to normal."

Redheart rolled her eyes, "easy for you to say, anyways when will we start the first real trial?"

Twilight responded, "I think tomorrow once I have time to configure things.” she said while Red Heart got to her hooves.

Redheart blushed and asked, "so...do you have ponies picked out already?"

Twilight nodded, "yeah Rainbow Dash and Fluttershy. Fluttershy will be the mother and Rainbow Dash the unborn foal. I also have Soarin coming to play as the dad just to give the roleplay a more realistic approach."

Redheart turned to see that Twilight didn't finish her milkshake and subconsciously took it sipping away on it greedily. Twilight looked up and blushed as she asked, "oh uh...you hungry? I have more in the fridge."

Redheart squeaked putting back on the table. "Oh no sorry mommy! I had no idea why I did that! Just really wanted something milky.".

Twilight cheeks kept burning as she made notes. “Right I'll just add, milk addiction to the list.” As she thought does Redheart know she's calling me mom? I’ll have to observe the others later for similar effects.”

Redheart blushed, "so...um...can I take you up on that milkshake?"

Twilight nodded as they walked to the kitchen she replied, "sure, come on also...when you get back to work could we borrow one of those baby scanners?"

“Oh, why?” Red Heart asked. “It’s not like it will work on an empty belly.”

Twilight responded, "it's for the roleplay and I'm trying to make it as authentic as possible.”

“Alright, I can bring one with me tomorrow?” Red Heart nodded. “Sounds like fun mommy.”.

The two mares made it to the kitchen as Twilight took out a strawberry milkshake for Red Heart. The nurse couldn't help but notice Twilight still had the pregnant suit on. “So are you going to take off the suit.” Red Heart teased poking at the baby bump. "Or should I take you to the hospital?"

Twilight rolled her eyes. "Haha very funny." Twilight pressed a button on the remote watching the suit deflated before slowly peeled it off. As Twilight placed the suit away Red Heart took her milkshake and began to suck in it as greedily before. Without realizing it she started to suckle on it like a foal would on a baby bottle. Twilight turned around and observed Red Heart with her eyes closed it was quite interesting and adorable. "Wow, whatever happened may have affected her psyche a little. Hopefully, it’s not anything serious and it will just wear off in a day or two."

Twilight slowly came over and asked, "Hey since you took the day off from work today, why don't you get some sleep here?"

Red Heart yawned, "that's not a bad idea."The nurse got to her hooves following Twilight upstairs to a spare bedroom. “You going to tuck me in, mommy.” she joked yawning again.

“W-well uh I guess I can,” Twilight said opening the door and leading Red Heart inside deciding to just play along. Pulling back the covers, she let the mare climb into the soft mattress before pulling the sheets back up.

The princess then took out something interesting a foal bottle with some milk inside. Twilight explained, " this is a special milk I made to help the subjects sleep and relax. Now you don't have to drink it I'll leave it on the nightstand if you need it. Goodnight Red Heart."

Nurse Red Heart was unsure of what to do waiting until Twilight left before eyeing the foal bottle and had a strong urge to drink it despite it being embarrassing. But she couldn't resist for long as she snatched the bottle and began to suckle its contents down her throat. It was creamy and delicious and it smelt so good! The nurse continued to suckle slowly with her eyes drooping sleep slowly came over her as she thought to herself. When I joked about Twilight diapering me I secretly was hoping she would do it.Oh well.