In the end, you decide you didn't just want 'one' kind of change. You wanted to try all different flavours of transformation on these kids. After all, you want a full test run of your transformation powers!
"How about we start with the girls!" you said. "Ella! You first."
Ella stepped forward. You eyed her curly brown hair and freckles. And you especially had an eye on her cute little coochie.
"Ella?", you started. You remembered how your changed Patrick into what he was the first time. All you had to do was explain to each Unit on what they'll turn into, along with any extra instructions. And the changes will start by themselves. "I want you to be an adult Doberman dog, with pointy ears and dark-brown fur. Oh...and you'll be a boy dog!"
Immediately, Ella's eyes sparkled. You looked down at the girl's feet, and spotted the first changes already happening. Dark brown fur was sprouting on her legs, which were changing in shape to resemble canine hind legs, with feet quickly shaping into padded paws.
"Woaaah!", exclaimed the other children, even Patrick and Becky.
"H-hey! I think I'm growing a tail!", said Ella, as she rotated around, showing everyone her bare butt. Her tailbone was extended outwards, until a bushy brown tail emerged out, wagging eagerly. You couldn't help but admire Ella's little bare rump, though it was quickly being covered by more dark fur too.
"Cool!", said Stephie, who put a hand out to touch it. Ella giggled. But then, her expression shifted.
"W-woah...my...my vagina!" Sure enough, Ella's slit was opening up, with a fleshy thing emerging from her hairless labia. You figured that was her clitoris, reshaping and growing into something else entirely.
"Oh yeah, you're turning into a boy dog! You're growing a dick!!" exclaimed Trevor. The children were in awe, as the long, thick and pink growth grew to full size, with her labia wrapped around it as a newly-grown sheath. Below it, a fleshy sack formed below, with two weird orbs inside.
"And balls!", said Oliver. "You're growing doggy balls!"
"This...is so...weird!" Ella panted. As she felt her new,ticklish parts with her fingers, the fur was getting up to her chest and torso, and she was finding it harder to stand up on her hind legs. Eventually, she started going off-balance.
"Woaah!!", the girl cried as she toppled over, landing on her hands. They were changing too; becoming paws just like her former feet. Her torso was shifting shape, and lean, canine muscle bulked up around new limbs and body. Her arms became skinnier, though no less energetic, while her shoulder blades protruded outward, and her spine expanded.
From the neck below, Ella now looked like a male dog with a human little girl's head, watching her own changing body in fascination. It was a surreal sight, though also a hot one. You half-wondered: maybe you should stop her changes there? You could leave her with her cute loli face, all while sporting a nice dog cock.
But no, you decide to go on. As fur crept up her thickening neck, Ella's ears popped upwards on her skull, and grew tall and pointed. Ella giggled as she managed to wiggle them around.
"Oooh!", Ella whined, as her jaw stretched out into a canine muzzle, with a wet tongue panting out under her sharp, white canines. Her nose flattened, and her nostrils widened, as Ella gained a rich sense of smell. Her hair vanished into nothingness, along with her plastic hairband, leaving only an empty, flattening scalp that was quickly covered in fur.
"Aa-ruff! Woof!!", the new male Doberman barked; the girl's voice had quickly deepened and gone gravely. Ella's eyes were the very last thing to change, with blue pupils shifting to beastly black.
"She's done!", said Patrick. Just as you had commanded, Ella had completely transformed into a male adult Doberman. Any physical sign of the little girl was gone.
The children gathered around in awe, and eagerly petted and scratched the new dog's body. Ella liked this, and he stepped up to sniff at the kids, testing out his new nose. He even leapt right up at Becky, and licked her face as she giggled; covering her cheek with slobber.
"Nice job, Ella!", you praised, scratching his head between Ella's ears. "Hmmm. I don't think Ella's the right name for you now. Any ideas, guys?"
"Rover?", suggested Becky.
"No, Max!" said Trevor.
"Cujo?", said Oliver.
You chuckled. "Maybe something a little closer to Ella? How about...Elroy!"
Elroy the Doberman barked, happily. Something else caught his attention, though. With tongue still panting, he lifted his leg up. A stream of urine sprinkled from his sheathed cock, and all over Elroy's former clothes.
"Eww! Haha!" As the kids all laughed at the sight, you reflected on what you just did.
You actually did it! You used your powers to transform someone! Of course, Patrick was your very first test subject, but doing it on a real child Unit was incredible! All your transformation fantasies were really just a command away.
You eyed Elroy's sleek, furry body, and his thick canine penis hidden in its sheath. Man, imagine when it finally got erect, maybe he'll mount one of the other kids?
You shook your head. Nah, that can wait. After all, there's still these other kids waiting to change, too!
"Alright, who's next?"