The Hammerpedes were intelligent drones of a biological weapon sent to Earth, not necessarily to destroy but to ensure that whatever intelligent life there was would not be a threat to the aliens who sent it.
However, due to a rogue solar flare just as the alien craft was entering the atmosphere of Earth, part of the program was lost. Still, the core mission was in place and the drones had the means to carry it out.
The Hammerpedes had several ways to reproduce, each with its own benefits and drawbacks, firstly it could segment itself, splitting into two and the two halves growing the parts which were missing. This for a period meant that the Hammperpedes were weakened, but smaller, which could at times be an advantage.
Then it could ejaculate thousands of embryonic Hammerpedes which would latch onto a host, parasitically absorbing nutrients while they would subsume each other, speeding up their growth rate. Female wombs were ideal for this.
They could also lay a larger egg, which would provide protection against harsh environments, and thus could survive outside a host of weeks before the baby Hammerpede could break out when the environment was right for finding a host.
To control a host body however required hijacking the host's brain with tiny seed-like polyps, that would lodge in the brain, grow microscopic tendrils and be able to influence brain signals. This was tricky and delicate work, it first required the polyps to be injected into the bloodstream a process which took up to an hour and then as they took root over the next few days they needed to be programmed.
The Hammerpede needed to be in close proximity to do this. Ideally next to the victim's head. The environment has a lot of electromagnetic interference which slowed the programming down. Hence a Hammerpede needed to be with its victim for several days after its initial conversion to get to a point of being close to control. Females therefore were better as they had a space inside them for the Hammerpede to live and grow.
The urgent priority for the aliens was to build a larger breeding pool and grow more Hammerpedes and link up with the other colonies.
The Laboratory
One of the newly segmented Hammperpede had stayed with Lina after her conversion, during the day it stayed in her vagina and cervix while at night it wiggled out to play with her brain. It kept her in a constant state of arousal which tortured her and on two occasions was too much at work and she had to use the bathrooms at work to masturbate, each time leaving her weak-legged and flushed.
On the following Friday evening, she returned to the colony (Maya's house), following the instructions by the Hammpede inside her. Dawn was already there and Lina shared lingering sensual kisses with each of them, they all felt a special kinship. As instructed no one discussed their Masters, the topic was beyond mere slaves.
Chloe arrived shortly after slightly flustered after her journey she gladly accepted a glass of wine...
Twenty minutes later she was semi-naked on the carpet of the living room, she could feel something gently sucking on her neck which felt incredible, while something else was in her vagina. She could not determine what these somethings were only that they were rapidly bringing her to orgasm.
Inside her the Hammerpede had injected her with a compound which made her cervix relax and enabled the Hammerpede to access her womb, where it released thousands of microscopic seeds, each on a tiny Hammerpede, they stuck to the walls of the womb, suppressing Chloe's immune response to them, and started absorbing nutrients. Over time they would grow.
With a master inside her, Chloe left the following morning, growing more Hammerpedes.
The three full slave girls pooled their resources and started searching for a base, it was decided that hiding in plain sight may be better so a research laboratory was considered the best solution. To explain the need for it, they created a company describing it as for medical research. The Hammerpedes have assimilated the knowledge about how human economies worked and were pleased to discover that Lina had substantial savings to further their plans.
They found a suitable laboratory in a science park in Reading, the rent was even subsidised for the first 18 months which was plenty of time for the aliens. The space included a small set of offices and two laboratory rooms.
The Hammerpedes ordered the girls to kit it out with tanks, a freezer and a soft floor, this proved a challenge but eventually, Maya found a company that could provide foam flooring with a waterproof cover. Ostensibly this would be to protect the "marine snakes" which the company was studying if they were ever dropped when handled, however, the Hammerpedes wanted to make sure that their valuable stock would not be damaged during the conversion process.
Soon they were advertising for new staff.
Lucy was their first hire, a lab assistant from a nearby biotechnology company, she had a 2.1 from Cambridge and wanted to fast-track her career which due to the job market had not started well. She was quite petite even in her platform shoes, her blonde hair naturally was would slightly curl, especially in damp weather. She had natural breasts, a C cup, but on her they looked large which always made her self-conscious. Being blonde and highly intelligent she was always concerned about not being taken seriously. The interview with Lina and Maya was pleasant, it felt liberating not talking to a panel of men and she really hoped she would get the job. She did a day later, with a start date at the end of her notice period, which for such a junior was only 1 week.
Second, they hired Layla Al Amri who was a recent graduate of biology, and wanted to do a Masters in genetics engineering. She had lived since age 10 in London after her parents moved from Jordan. Her strict Muslim parents had meant she lived at home with them and her younger sister.
Layla was olive-skinned and long raven-haired with naturally flawless skin, her family was Jordanian Arab and she was a classic Arab beauty with high cheekbones and piercing almond eyes, accentuated by her carefully shaped eyebrows. Despite her beauty she was demure as her parents demanded, modest and quiet.
Like her mother she was slim, and she carried herself with the grace. She wore a Hijab, a cloth which was wrapped around the head to hide her hair and neck, it accentuated her face shape and could not hide her beauty. It was considered modest among Muslims and Layla's conservative parents had left her no choice when she was 12.
She had applied without much hope, but a telephone interview with Maya had resulted in a job offer and now she was here.