The alien manipulation began its next stage, the creation of a new species to replace humanity. A perfected creature that addresses the worst shortcomings of homo sapiens.
Pale skin developed a shine, quickly darkening to a glossy black across the blanked human's limbs. From throat to groin an equally glossy crimson red manifest. As slick, shiny, and enticing as this new skin looked; the real purpose was durability. Made of a highly elastic polymer, it would resist almost all attempts to cut or puncture.
The unthinking body arched its back reflexively and rolled onto its stomach as flesh bulged on its backside. Wings surged into being, stretching out to a 20 foot wingspan, crimson webbing with the limbs themselves a complimentary black.
A thick reptilian tail stretched below, with a diamond shaped spade flaring on the end. It stopped growing when it was most of the width of the creature's hips and half again longer than it's legs. The red from the transforming creature's chest extended down the underside of the tail, the rest matched the shining black of the creatures limbs.
With audible pops, legs reshaped into a digitigrade stance, with four wickedly clawed toes and dense flat black pads on the bottom. This lengthening would put its height at a long legged seven feet when standing. It's hands shifted as well, pads forming on the palm and finger tips. The fingers themselves stretched long and slender, tipped with one inch razor claws. Those talons were flat black and razor sharp, made of a flexible but nearly indestructible exotic carbon compound. Under it's skin, bones transmuted to the same durable material.
Slowly the blank human face pushed out into a reptilian muzzle. Four glass like ebon horns stretched straight backwards from the rear of the elongating skull, reaching a foot in length. Ears pulled in, leaving two small holes for hearing. The white orbs of its eyes gained features, sclera darkening to black around a violet iris - split vertically by reptilian pupils. With a silent scream, it spread it's long muzzle wide, revealing an impressive array of sharp needle-like teeth. A long slender tongue flicked out a foot from its open jaw before snapping back inside.
Still on all fours, the formerly unthinking mind began to fill again with new purpose. This was the same mind as before, stripped of all memories and familiar connections; now filled with a new purpose and motivation. It was not an a sexless 'it'. A feminine identity coalesced; she would be powerful, sexual, confident. She would begin the erasure of humanity, by transforming those worthy and by breeding new generations of her kind.
Much more than this, new connections formed in her brain. Entire new lobes and structures took form, ones with no parallel in terrestrial biology. These would grant her psionic powers in addition to greatly enhanced intelligence.
Her hips widened and waist narrowed as these thoughts reverberated, a vaginal slit opening and venus mound swelling. She might feel like a female, but it wouldn't be all she was. Inside her slit she felt a cock develop, able to extend outward on demand. Her new species would be beyond the battle of the sexes, everyone fully equipped and possessing the attributes of both.
Her transformation was reaching its conclusion, but a few things remained. Muscle swelled under her skin; swelling biceps, and pushing six pack abs into definition. Her thighs and ass surged with power, thick muscle adding to her feminine lower body. Her chest deepened, a thick layer of flight muscles barreling her torso a bit, though her shoulders kept a feminine narrow proportion.
As she stood, her wings folded in, shrinking as the went. The mass flowed out of her wings into her chest. Despite the feminization of her body, until now she had no breasts whatsoever. This rapidly changed as her body drained fluids from expansive tissue in her wings and swelled out gravity defying melons on her chest. She did still have small black nipples, a lasting momento of her prior mammalian life. These tits would never be suckled by young, her children would be born able to eat anything and possessing much of the knowledge of their parents.
The last change was a few faint pops as her neck lengthened by a few inches. Unseen, that growth had made room for complex web of glands which would brew the same metamorphic cocktail which had created her. They linked up to a small stinger on the underside of her long prehensile tongue.
With confidence, the new creature stood proud. Her alien creators had sculpted what appeared to be a living rubber dragon sex toy. Appearances are receiving, she would be the most dangerous creature ever to walk the Earth.