It didn’t take long before the Nightmare encountered its first victim. Right as the demon-horse set off, a little girl was skipping down the street in a pink, fairy princess outfit. Kat grinned, as Nate and Patrick watched what was about to unfold.
“Whoa!”, exclaimed the girl (who looked around eight-years old), looking up as the Nightmare clopped up to her. It snorted another flaming huff from its nostrils, which made the girl giggle. “It’s a fire horsey!”
The Nightmare cast its eyes down upon the little fairy princess, with her pink dress and fabric butterfly wings. It met its vision with the girl’s own eyes, and the girl suddenly found she couldn’t move. The creatures power’s had taken hold.
The Nightmare stepped over the child, as the little girl, now in a trance, kneeled down in silence under its body between its forelegs. In front of her, the Nightmare’s long cock emerged from its sheath again. Its flared head (once having the face of a young boy) pulsed hard, just inches away from the little girl.
The whole time, Kat noticed, the child was still holding an empty little bag for Halloween treats. She’s about to taste something even better, mused the vampire witch.
The cock met the little girl’s face, and she licked without protest, tasting the strange cream already coming out. Then, remarkably, the girl pushed in and took the whole cockhead into her mouth, stretching her lips and cheeks like rubber. The hard horse member lifted the girl up, as it slid into her throat and soon towards her stomatch. She brushed the ground with her little hands, and her sneakered feet struggled to stand.
The first change came, as the little girl’s hands twisted the other way around, with no sign of pain from the child. They hardened into hooves pointing the other direction, while her upper arms bulked with muscle, stretching her pink princess costume. Kat laughed, as she realized what the child was about to become.
Her body started to swell, with black fur spreading like a curse. In seconds, her pink princess costume stretched around the ballooning torso, until they burst to tatters along with her panties. Flesh quickly filled under where the Nightmare stood, enough that the Nightmare found itself having to rest its chest atop of it. The girl’s body didn’t buckle, as her little feet had quickly blew out of her sneakers to become new forehooves, on a pair of long, front legs.
The girl’s butt pushed out into a larger lump, a little further than the Nightmare’s own head. From that lump grew pointed ears, a snout, and a single, long horn from where the girl’s tailbone was. Two eyes opened from the side of the mass, revealing purple, spectral eyes. The girl’s vagina had morphed into a different orifice altogether, with equine teeth and a long flat tongue that Kat liked to imagine was her clitoris.
Kat stepped closer for a better look, and kneeled down. The little girl’s lips were now kissing the base of the Nightmare’s cock. She didn’t have much of a neck anymore, as much of her head had sunk into her enormous torso. The child’s face was all that remained, a spot of pink flesh in a dark, furry rump.
“Feels good, doesn’t it?”, asked Kat, as she brushed the massive horse buttcheeks besides the girl’s face. The little girl turned her eyes at Kat. They didn’t look frightened or sad. They looked excited.
The last changes arrived. The girl’s nostrils merge into one, and the rim of the new hole grew into a vulgar, wrinkled donut, so big the girl’s eyes had to move apart. Below, her stretched lips morphed into a mare’s filled vagina, with her tongue jutting out below her lips to become a horse’s clit. The last of the girl’s pink skin became a shade of black, musky flesh.
It’s during this that the Nightmare properly gripped its new mate with its hooves and thrusted. The little girl’s eyes rolled, as the Nightmare’s heavy testicles slapped her former chin, and Kat moved back to watch the fruits of her magic. What was once a little girl dressed as a fairy princess was now a dark unicorn, born from reverse. The Nightmare hammered its cock, over and over, and the two horses soon whinnied in climax; its cries jolting the nerves of everyone who can hear them.
The Nightmare slid off, letting the unicorn free. Semen and other juices leaked from the little girl’s cunt-mouth. Her eyes remained on the unicorn’s ass-cheeks, and they looked at Kat and her friends with pride.
A stream of piss tinkled out of the vagina, splattering the pavement. Kat laughed. And it seemed, so did the little girl.
Above the child’s 'forehead', a horse tail grew out, in the same shade as the unicorn’s mane. It fell, and covered their anus and vagina with some semblance of modesty. The twisted horses proceeded down the street, as the little girl’s eyes looked back on Kat and her friends. Patrick couldn’t help but give a little wave.
“Looks like another horse prowling tonight,” Kat quipped. “You wanna follow them?”
Patrick shrugged. The night had been extraordinary so far. He had been awed by all her witch sister's abilities, and he couldn’t even imagine was else was in store. “Maybe. Can you turn people to anything else?”
“You bet. Come on!”