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Just a Little Experiment

copyright comidacomida 2023

Kristina and her brother Christopher were fraternal twins, and they shared just about everything, including a name. By the time they were in high school they each went by Chris, though Kris spelled her name with a K rather than a CH. Although Chris was a little broader shouldered they even shared clothes, shoes, and, on a few occasions, boyfriends. Neither of them were sure what they wanted to do when they finished high school so when they tested in the top decile for admission into the Unity Programme they made the decision together and elected to share in that as well.

They were each assigned to Hilltop, the newest addition to the Unity Program to account for the ever-increasing number of Earths being discovered by famed scientist Dr Angie Mae Kline. Rather than just learning about one or two other races, students at Hilltop were all exposed as a group to the various races of the Many Earths. Hilltop was an identical structure located in the mountains of New Zealand on Land Earth, and the same location on every other version. On Land Earth there was one Human student per non-Human; a total of 160 students and half of them were Humans.

Kris and Chris both excelled, ascending to the ranks of senior students off of their many merits; Kris' focus was Xenobiology while Chris excelled at Xenosociology. Together, they were nigh unstoppable and, as far as Kris was concerned, the sky was the limit. As the twin who always pushed the limits, she considered it not only her job, but her mission to make sure that Chris went outside of his comfort zone so that they could be successful together. Most of the time he relented and followed after her but, on rare occasions, he seemed almost as excited as she was to jump into things headfirst. The proposed 'Experiment 8' was one of the times where he seemed almost as excited as she was.

For as long as Kris could remember, they were both excited about the prospect of having kids at the same time. Since Cetacation had become mainstream near the turn of the century, she and her twin would often daydream about being pregnant together. It astounded Kris how much Chris often talked about having a child, and how amazing he'd look pregnant so perhaps that was one of the forefront reasons why he was so quick to agree to quite the challenge. Kris wanted to see how the Human body, both male and female reacted to impregnation by the other various races.

With careful understanding of motility, fertility rates, viability, and even distance from point of ejaculation to point of conception, Kris had worked to remove as many variables as possible. Kris knew that children conceived by Unity Programme students could be fast tracked to become Unity Programme students themselves, and would receive complete care and support; what better way could she introduce her child (and her niece or nephew) to life than to give them that? Plus, she had to admit, there was no shortage of eye candy among the other students and she was certain that she turned more than one or two heads.

As an extracurricular experiment she'd be documenting, she and her brother had more than two weeks of prework to complete and, since Cetacatian wasn't instantaneous, they started Chris on the regimen. During that time they went through potential program partners, identifying potential males to engage in the conversation and recording the necessary vitals. The Oolou were an obvious choice; Chris had fooled around with Rylsin occasionally and the husky-looking Seeker seemed to enjoy his company while Rylsin's best friend, a Steward who had grown up on Land Earth had often expressed an interest in Kris, though she'd been too focused on her studies to reciprocate... but that was about to change.

The Phin were also easy choices since a pair of Longos twin brothers were in the same class as the Human twins. Dipper was the obvious choice for Kris since he had a thing for females, while Tapper had already had (protected) sex with Chris in the past. From there, Kris identified Folii and Churcho, a pair of Lokali Ilaki who seemed VERY interested in trying things out with Humans; based on their measurements and Kris' overall carefully timed experiment, Folii would pair with Chris while she would get Churcho. With the easiest parings out of the way, things got even more complicated.

Working through the math that would give the greatest opportunity for all gametes to meet up as close to synchronous as possible meant that sperm speed, penis length, distance deposited, force of ejaculation, and many other factors had to be carefully balanced. Fortunately, one variable was simple enough: Kohsig,Ilsit that shared a class with the twins was one of the rare one-out-of-five Greater Drones that had two hemi-penises, meaning that he could breed both of them at the same time.

That still left several more variables and, thankfully, Cikkil, the lynx/falcon Viddinur in their class was happy to oblidge; the student from Plateau Earth had a refractory period measured in seconds that did not reduce sperm count or motility until the dozenth-or-so ejaculation, and so Kris could fit him easily into the schedule. After that, things got much more difficult.

Brahhs and Rhengro, a pair of bear brothers from Forest Earth fit into the mix, as did Umor and Peris, half brother Lions from Central Earth. From the Veldt Earth, Chris had actually found a pair of young Bucks who were eager to try impregnating Humans, which left Savannah Earth, which raised its own set of problems. Kris knew well enough that the Elephants separated males and females for most of the year, especially during mating time when the males would become violent. Boors, one of the few male Ennigi in the class was willing to play along, but his condition as that nobody was aloud to get hurt; he would have to be in an isolation pod and someone would have to collect semen from him since the prospect of mating the traditional way was far too risky. Despite how reserved he sounded, Kris could tell he was excited.

General vitamins and simple gene therapy kept them calm for classes but it also removed their sex drive. Kris came up with a plan, but it took the effort of a half dozen of their volunteers to put together an isolation pod with a suitable 'slot' for him to offer his 'contribution'. The fact that Kris and Chris would be artificially inseminated with Boors' semen was one variable that made the rest of the complicated math easy, and she was able to finish the plan accordingly.

Kris would be mounted by Dipper first, followed by Cikkil, then Brahhs, followed up by Churcho. After that she would be inseminated with Boors' semen, then be mated by Kohsig, next would be Rylsin, and finally whichever Buck from Veldt Earth didn't get her brother. The timing would have to be perfect, but she was confident it would work.

Chris, on the other hand, would start off with Rhengro then Tapper, followed by Cikkil and Folii. He'd join his sister by being mounted by Kohsig, and then he would be inseminated with Boors' contribution. After that, he'd accept a 'deposit' from whichever Veldt Earth buck was closest to ejaculation (the timing would be really close so they'd have to 'pregame') and conclude with Rylsin.

Things went surprisingly smoothly, though there were a few hiccups, such as Cikkil cumming once from excitement before he mounted anyone, then again between ejaculating into Kris and mounting Chris, or that one of the assistance Kris talked into helping got a black eye when collecting semen from Boors-- his penis pulsed with such force the attendant was almost knocked out. Chris relished the feel of holding her brother as Kohsig impaled them both, and reveled in the feel of him shuddering as the lizard pumped them both full of his seed. The biggest surprise was probably when Rylsin knotted her brother; most folks who didn't know better usually thought that happened all the time, but Oolou usually only stuck if there was a connection. She thought it was cute... especially when Ryslin called her brother 'babe'.

Experiment 8 had started late evening, but it was after midnight by the time everyone had gone home-- except for Ryslin, who decided to stay over so that he and Chris could have more time together. The Oolou had fallen asleep, leaving the twins to talk. Chris was still laughing about the entire process, laying on his side as they spoke since he wasn't quite able to sit. "I STILL can't believe that Director Kline gave you approval for this experiment."

Kris offered a sheepish grin. "Well... about that..."

Chris leveled her a stare. "Kristina... you DID get Director Kline's permission... right?"

The young woman reached across the distance and patted her brother's head. "She'll be okay with it once I provide the findings."

Chris rolled his eyes. "You gotta be kidding."

Already thinking of the future, Kris rubbed her belly. "I wonder which one will take in me..."

Her whistful tone must have done it, as Chris' anger abated as he rested a hand on his own stomach. "I hope it's Ryslin's... I'd love to have an Oolou puppy."

* * * * *

It was barely two months before Chris started showing-- almost one month later for Kris, but it didn't take too long to figure out why. Kris, as expected, was only fertile until the first joining of a sperm and an egg; she was going to have the first Human/Ennig hybrid. As for Chris, was usual with Cetacation, the merging of a Phin semen with Human semen kept any more Human/Phin hybrids from taking but, apparently the hormones did nothing to prevent the other species; Chris was expecting EIGHT offspring-- one from each father.

Kris tried to look on the bright side. "At least you're getting an Oolou puppy!"