Hypothesis: Foals

“Twi-, I’m not sure about this..” Rainbow bemoaned, her forehooves crossed in front of her.

Twilight looked at her with what seemed to be hours of exasperation bottled up into one gaze. “Look Rainbow, you’ve already taken the potion. You’re already most of the way there. I can give you some privacy if that’d help, but we need you to finish for the experiment.”

Rainbow threw her hooves into the air, “What experiment!? You’ve been shady about this since the beginning. What scientific good comes from me having to cum in a-”

“Rainbow! Language.” The alicorn tapped her friend with the end of a pen

“Sorry” Though she didn’t sound it for a second, “What good comes from me having to ejaculate into a jar”

Twilight let out a long sigh, a flash of magic pinching the gap between her eyes. “I was asked to do an independent analysis of the virility of alchemical penises. That’s it. Like the briefing you were supposed to read would’ve told you.”

The pegasus’s wings flapped unconsciously, “I did, it’s just…” She paused for a moment, “Nevermind. Sorry Twi, it’s just a bit weird to me is all.”

Twilight smiled back at her friend, “That’s completely fine Rainbow, as I said I can leave to give you some privacy if that helps”

She slowly nodded her head, “Y-yeah, I don’t think I could do it if you were standing there. No offense.”

The alicorn was already on her way out of the room, she turned her head back towards rainbow whose face was bright red. “Just make sure to fill that beaker as high as you can, I’ll be in the next room once you’re done.”

Not waiting for a response, she stepped through the door and closed it. It wasn’t until she took a moment to breathe did she realise that her tail was flagged up almost all the way.

Oh Twilight thought to herself, Well at least she got a show

Twilight pulled the clipboard up into her sight, she crossed an item off the list with a sharp tick. Now all that’s left to do is wait. She absentmindedly looked back over her list

It’d taken a lot of planning. A cover story that wouldn’t get questioned, a participant that wouldn’t brag or squeal, and a friend that trusted her enough to buy it. Rainbow just happened to help all three in one.

She thought back to that morning when she had proposed the idea to her. In person of course, and with a lot of the details in the air. Rainbow had originally been really dismissive about the whole thing. But a few tugs on the right strings had the loyal mare agreeing to meet her at the castle.

Good thing she had, the backup would’ve been way less attractive

Knocking her out of her thoughts, the door to the lab opened behind her. An extremely red in the face Rainbow trotted out, her wings splayed as she walked. They met eyes for just a second before she broke it.

“Everything okay Rainbow?” Twilight asked

Said mare nodded rapidly, the blush on her face still ever present. “Y-yeah, beaker’s on the table Twi. Just like you asked”

Twilight crossed the next item off of her checklist, “Perfect, thank you very much Rainbow. There’s a counter-potion on the table upstairs, after you take it you’re free to go”

She silently nodded before quickly trotting up the staircase, her tail unfortunately glued down tight. Not letting a single peak behind.

Twilight shook her head before heading into the lab herself, she’d only get one shot so she needed to keep her mind clear.

As soon as she entered, she saw the half filled beaker sitting on the side as promised. There were stains along the side of the glass, dripping slowly down to the wooden table it was sat on.

She moved quickly, grabbing the beaker in her magic as she trotted across the room. Semen only had a few short minutes of viable shelf life if exposed to the elements, and she wanted the best shot she could get.

The alicorn grabbed a long pipette out of the drawer, a tool she’d used many times yet never for something like this. One squeeze later, and she had a tool filled with virile cum ready to knock up a mare in heat.

Another reason this couldn’t wait.

Twilight had waited patiently for this, counted the days until her body would be at peak fertility. She didn’t want to leave a single element up to chance.

She levitated the pipette behind her, pressing the cold tip against her outer lips. Biting her lip to keep quiet, she pressed it inside. Not needing a single drop of lube, she was already more than soaked with how close she was to her dream.

Deeper and deeper she pressed the tool, her magic flickering as the waves of pleasure passed over her. After what felt like an eternity, the tip bumped against her most inner seal. The final barrier to knocking herself up.

She took a deep breath, steeling herself for what was to come. Twilight shoved the tool in with her magic. A strong flash of pain struck through her, knocking her magic out for just a second. Her twitching inner walls were the only thing that kept the tool from falling out.

But she had done it, the breeding tool was lodged in her womb. With just one squeeze, she’d be knocked up and all would be good. Her magic fiddled with the bulb, teasing herself for just a second. She slowly increased the pressure, feeling a small trickle of cum drop in.

She’d spend all day like this if she could, the slow cum dripping. Filling her up slowly but surely. A foal of her own sealed to be into this world, more sure with every drop. It was intoxicating.

But sadly, not to be forever. Soon, she felt the plastic bulb press against the other side. Signalling with nothing more that all the liquid inside was now gone. A small sigh left the mare as she slowly pulled the pipette out. She had done it

With the tool fully out, she flew it up to her face to admire it. Aside from the wetness sheening the outside of the tool, there was no proof of what she had just done. Though her flagged tail might tip people off.

She still had work to do, lots in fact. The remaining cum had to be frozen, it’d expire way too fast otherwise. At least this way it had a chance of lasting. She needed to clean up too, the tools and counter’s were stained far too much for a lab of Twilight’s name. No way she could ask spike to help either

She’d be busy, probably for a long while. But she was sure it’d be worth it.