Tube Twins - Sex Stories

Tube Twins

... immature minds, the old show ‘Happy Days’ seemed like a long string of toilet jokes.

Over time we noticed our bodies were slightly different. Girl had a small pair of lumps growing on her chest, but I didn’t. She was missing a few things I had between my legs. My arms and legs were also a little larger than hers. We asked several times, but Mama assured us that was normal and we shouldn’t worry.

At age 20, we got our most exciting lesson to date, ‘Human Reproduction, part 1’. We saw a nude male, and Mama named all the parts and described how they worked. My sister seemed much more interested than I was. Next we saw a nude female. The computer named the more plentiful array of parts and their functions. I was fascinated, but Girl barely paid attention. The lesson mentioned, “Natural human gestation to infancy lasts approximately 41 weeks, and takes place in the uterus of a female. Mechanical gestation is safer and more efficient.“ It was so efficient, we would be ready to start work on our PhDs the day we were ‘born’.

The image changed to video. A robotic arm removed a long metallic object from a vagina. The computer voice informed us, “Forty egg cells were extracted from the female parent and analyzed to determine which were healthiest. The eight best were fertilized with a sperm sample from the male parent.” The image changed to a thick white liquid squirting from the head of a penis. I felt excited, but slightly ill. I could tell Girl’s reaction was ...

... similar.

“The remaining genetic material is stored cryogenically, along with material from 49,998 other humans. Fertilization occurs when a sperm cell from a male contacts an egg from a female, and the two fuse into a single organism.” We saw a microscopic view of sperm cells penetrating the outer surface of the eight eggs. One of the eggs had divided in half before the cloud of sperm reached it. We realized that was US! “The embryos were allowed to divide until there were more than a thousand identical cells in each. One cell was removed from each embryo for genetic analysis. An egg had cleaved in half before fertilization. This one was determined to be the most disease-resistant and contained no significant flaws. It was moved to the growth tank 7,660 days or almost 21 years ago.”

The lesson ended and an entertainment video played. When class resumed half an hour later Mama said, “We are travelling to a planet far from our original home. This is our ship.”

A map of the interstellar spacecraft displayed in our implants and our minds boggled at its enormous size. It was a terrible shock to discover there was more to the world than our small tube. There were four gestation cylinders, not just ours. The infirmary compartment they were in spanned over thirty meters in both directions! The ship was 800 meters wide and three kilometers long! The world was millions of times larger than we expected!

My twin ‘shrieked’ mentally and started flailing her arms. I felt the terror of serious ...