"We have come prepared with our facilities to mold our loyal servants into your proper forms," they stated as smaller ships began descending all over the world, their shapes resembling factories of some sort.
Excitedly, we all began to line up at every "Conversion Centre" to obtain the perfect forms of our masters. The lucky first convert just so happened to be the first female the masters laid their eyes on in disappointment: a young woman named Helen, who was eager to fix her awful form in order to redeem herself and present a more suitable appearance for the masters.
Stepping up to the entrance of the centre, it seemed to almost come to life as its lights shone brilliantly all over.
"State your name and consent" a synthesized version of the masters' voice emanated from the building.
"Helen Michaels. I consent my body and mind to the masters." she says formally, yet with clear eagerness.
With that, the force field that was covering the door powered down, allowing Helen into the centre. The inside resembled a sterile room, with walls of white lining the entire building, being contrasted only by the numerous mechanical devices that awaited her like a factory conveyor line.
Stepping up to the first station, the two walls situated there enveloped Helen with a light grid from top to bottom and back to the top, scanning her form. The screens around it revealed that her body shape was close to ideal, but still inadequate. At that result, the walls enveloped her in a light not unlike a tanning booth while two mechanical arms came out to greet her, causing Helen to automatically hold her arms outwards to her sides like a T-shape. They began to work symmetrically at her sides, making her already feminine curves even more pronounced, expanding her hips and thighs while thinning her abdomen and calves. Along with her hips, the arms also worked on her rear, causing her ass to expand becoming a prominent bubble butt.
After the screens turned green, signalling her body shape to be ideal, Helen walked to the next station, her hands back to cradling the front of her crotch. As though she already knew what the station would scan her for, she frowned, looking at her chest and crotch area, scorning the presence of her female anatomy. As she expected, the screens this time flashed red, alerting unacceptable parameters. This time, a mirror moved over her head before enveloping her in a blue beam, causing her DNA to change her chromosomes from XX to XY. Pleasure washed over her body as another pair of arms emerged from the station. Helen couldn't help but moan, her antennae bouncing in lust as one arm began to press against her chest until only a flat smooth surface remained, even devoid of nipples. The other arm gently inserted itself into her vagina, causing her to moan even louder before it began pulling back out, grabbing along with it smooth flesh like her skin. As it began to pull out her new penis, her vaginal lips began to swell, becoming filled with her new male anatomy. When her new cock was finally pulled to the ideal length, its base and her new ballsac let out a satisfying *POP* as her smooth skinned sac landed in her cradling hands.
The now-male Helen moved on to the final station after the screens revealed the success of her sex conversion. After the scanning of her yet still inadequate form, two new arms revealed themselves, one resembling a dark visor and the other a tube like dildo. The visor arm placed itself over her eyes while the tube arm moved to carefully insert itself into her ass, the young women still allowing this to happen with zero resistance. The two began to work in unison like the other arms, with the tube arm pumping a gray liquid into her body via her ass, causing her skin to become gray and smooth like the masters while adding the DNA of the masters, her fingers becoming slightly elongated with the tips swelling into soft nodes and eliminating any extra body hair except for her head. The visor began flash brightly into Helen's eyes, each flash turning her eyes a shade darker. Not only that, but with every flash and darker shade, her mind is wiped clean of human morals and principles, her previous human life soon meaning nothing to her. As the process ended and the two arms retreated from her body, they revealed her smooth gray skin and her beady black eyes, devoid of any human thought except for the will of the masters.
Helen then advanced, leading her to the other end of the centre where her new, alien form was presented to the masses. Cheers were heard around the world for the first step in pleasing the masters. A mirror was lowered so that Helen herself can witness her body: a voluptuous form made with the correct male anatomy and gray alien features of the masters. The sight excited her so much, that she couldn't help but moan and cum for the first time with her new cock, celebrating her redemption in front of the masters. Our masters in turn were pleased, congratulating her with their own shower of affection through their seed which she accepted happily. It was then that the centres all over the world opened up and began the steady conversion of the human race into the blessed alien forms of our masters.