"You see those special ponies here?", said Miss Angie, gesturing to Nadia and Lib. "You see...as an expert of animal love, I'm also an animal matchmaker! These two have quite the crush on each other, but they're a little too nervous to show it! So, I'm going to need your help!"
The little girls liked the idea of playing cupid with ponies. "Okay!" said Heather.
"But how?", asked Olivia. "Are we giving them a date?"
Angie laughed. "Yes, actually! Just a lovely date in the early evening, with you as their...helpers."
Before the girls could ask what that meant, Miss Angie snapped a finger. Both Heather and Olivia fell into a strange daze, as their clothes suddenly shimmered with magical light. Their shirts, pants, shoes and even underwear dissolved into a magic dust that blew into the air, leaving the girls sitting on their naked little bottoms on the grass. The two friends were stark naked.
The girls blinked. "Wait...huh?", stuttered Heather.
"Where are our clothes?!?", Olivia asked, in a mix of confusion and embarrassment. Angie's magic ensured the girls wouldn't go into a complete panic, but the witch left the girls plenty of freedom to go red-faced. Which they both did.
"They're getting in the way!," Miss Angie replied. "After all, if you're going to help Lib and Nadia here, you're going to get a little up-close! Besides, now you'll be in the same level as these ponies. Free in nature!"
Miss Angie rose to her boots (she was still very much clothed.) " Come on! These ponies need our help for their date!"
She presented hands to both Heather and Olivia first. Unsure, and still very bewildered, the girls took her hands, and got onto their bare feet. Neither of them found sense to ask how their clothes could just 'vanish' from existence.
"Now, let's start with our hot stud here," said Miss Angie, leading the nude little girls to Lib, who was drinking from the stream while Nadia was nearby grazing. "Olivia, you're going to pair up with Lib, and help him win Nadia's heart! Sound good?"
Olivia nodded, somewhat hesitantly. Miss Angie bent down, and cupped a palm on Lib's furry sheath. The pony stallion twitched, and lifted his head from the stream.
"Now, Olivia, come closer." Angie gestured her head to Olivia, and the girl stepped closer to Lib's front, and gazed at that blubbery pouch holding Lib's member. Gently, the witch took Olivia's arm, and placed her hand on Lib's sheath. Olivia flinched at feeling Lib's warm skin, and Angie giggled. The stallion didn't move or object, though its legs did jitter a little.
"Feels nice, doesn't it?", said the witch, as Heather watched her friend and Miss Angie's strange act. "You know what it is?"
Olivia blushed, and nodded. "His pee pee"
"It's also known as a 'penis'...or a dickie", said Miss Angie, smiling. "All boy mammals have it, and ponies like Lib here have quite the big one! It's not just for peeing."
"It's not?", Heather asked.
"Of course not!", Angie giggled. "Boy mammals, like us people and ponies, use penises with other girl mammals of their type! To make babies!"
Heather and Olivia both went quiet, with wide eyes. They'd learned a few things about sex before, mostly from rowdy jokes among boys at school, and also a few picture books. But it was all so new hearing it from Miss Angie, and in such a blunt way.
""So...so Lib wants to make babies with Nadia?!" said Olivia, awed.
"That's right! He's just too shy to show it to her. So you're gonna help him, and make him less nervous. Wanna see how?"
Olivia nodded.
"Good! First, lets get Lib's penis out of its hiding space. It's in a little pocket right now, see? We've got to bring it out, by exciting it!"
Miss Angie wrapped her fingers around Olivia's brown wrist, and moved the girl's hand along Lib's sheath. With a firm grip, Angie guided Olivia's palm in a circular motion, making Olivia massage Lib's equine pouch. It took barely a few brushes before Lib stamped his front hooves in pleasure, and his stallionhood emerged.
"Oooh, I think he likes it!", said Heather, watching the sight with excitement.
"He does!", Angie giggled. Olivia gawked, seeing Lib's huge horse shaft rise out from his sheath, like a pink fleshy train coming out of a tunnel. Olivia had seen it earlier, when she was meeting the stallion for the first time. But it was different seeing it so up-close. The length was longer than Olivia's entire arm, with a swollen, round head dripping with the same goo that splashed her earlier.
"What's that sticky stuff?"
"The stuff that goes into girl ponies to make babies," said Miss Angie, simply.
"You mean...into their butt?", Heather asked.
"Close." The witch grinned, as she held back her devilish excitement. "Olivia, I think you can show her."
"Me?"
"Crawl over there," Angie pointed. "Right under Lib, on your hands and knees, with your butt pointed at his penis."
Olivia did as instructed; getting down on all fours. After all, it was only normal, after all, that a grown-up pony trainer would know best. And she did want to help.
Ducking her head down (and moving aside her shoulder-length black hair), the girl crawled under Lib's undercarriage on the grassy ground, with grass tickling her palms and legs. She blushed as Lib's big member tickled the side of her left buttcheek, which got the pony snorting loudly. Stopping where Angie had indicated, Olivia brought her butt slightly upwards.
"Steady, Lib," said Miss Angie. "Alright, perfect! Keep your butt up Olivia, and don't worry, he'll find his way right in."
"B-but it's so big!!", said Olivia. Heather's own eyes popped when she realized what was about to happen with her friend.
"Don't worry, it won't hurt. Even a little."
"I-it won't?"
"Not at all! You see, you'll feel Lib poke through your vagina, and slip his penis right up to your belly. There's a little trick involved, so all you're going to feel are nice feelings," said Miss Angie. "And I bet you're going to love those feelings."
The witch stood up, and leaned up to the pony stallion's ear. "Not too rough, Lib. Slowly and easy, alright, big boy?"
Lib gave a low whinny. With a strange carefulness for a horse, Lib shifted forth; causing his flared stallion-tip to press between the girl's buttocks. Olivia gulped, as the big mushroom-like cap painted her butt with its strange slime.
Angie knelt down, and patted Olivia's bum. "Relax, sweetie. Lib knows how to be gentle."
And with a hand on the lengthy shaft, the witch gently guided the stallionhood to its target; down past Olivia's anus, until the cock's urethra touched upon Olivia's little vagina. The girl shivered at the touch to her most private parts, waiting for some unimaginable pain.
Unexpectedly, Olivia felt another hand upon her own. Heather had crawled up right next to her, smiling. "You can do it!", her best friend encouraged, looking almost as nervous as Olivia was.
Olivia smiled bravely back. And then, without warning, Lib pushed.
The girl didn't know how, but her little privates just....opened. Olivia's labia parted way as if nothing but soft rubber, as the horsecock slipped in with ease. She gasped aloud as the warm stallion-flesh slid further inwards, her loins buzzing with a strange pleasure she'd never felt before. It drilled deeper in, with her insides squeezing around the pulsing shaft.
"Ohh, ohhhhhh," Olivia moaned. Again, Lib snorted loudly above her, and stomped one of his front hooves. Eventually, his penis plunged all the way inside; stretching Olivia's belly out like a little pregnant tummy.
Heather was in awe at her friend's feat. "Whoa...how do you feel?"
"G...good," muttered Olivia. She proceeded to moan further, as Angie guided the cock as far as it could go, until Olivia's butt almost touched upon Lib's heavy ballsack.
"Well done, Olivia!", Angie grinned, rubbing the girl's ass. Lib snorted and nickered loudly, enjoying the tight, slippery warmth of the girl's insides. With how deep Lib was inside Olivia, the girl's lower body and legs were almost lifted up by the pony's shaft.
"I bet you liked how it felt, huh? Now, try to raise your legs and arms in the air."
Olivia complied; lifting her limbs up high like she was pretend-flying. As she did, Lib's penis squelched within her, sending more shivers to the girl's mind. Yet remarkably, the pony stallion's dick was strong enough to hold the girl up.
"Wow, Lib is really strong!", said Heather.
"He sure is," Angie smirked. "Now, here comes the really nice part..."
The witch weaved another mental incantation, and snapped her fingers from behind her back. Suddenly, and beyond any possible comprehension in the children's minds, Olivia's limbs started withering away. Fingers and toes merged and vanish, and their feet and hands shrank to their legs and arms, until they too withered into stumps.
"W-what?!?", Olivia exclaimed. Heather gasped, seeing her friend's body change, while Olivia could only feel the tingling and numbness. The girl looked down at her shrinking limbs, and tried to move her feet and hands. But nothing was there. She wiggled her shoulders and elbows, and nothing but stubs waved back.
"My legs! And arms!!!", said Olivia. The mental spell was still doing its work to prevent ful blown panic, though the girl was still quite concerned. "They're gone!!!"
"It's...magic?" said Heather, in confused uncertainty. The mental spell on the two girls was adjusting itself; letting the girls have understanding, but also making sure neither girl was too frightened. "Whoa, it's magic!!"
Miss Angie nodded, proudly. "You got it! No need to worry, Olivia, you'll get them back later. Think of it as your legs and arms being put away, when they're not needed. After all, what kind of penis would have arms and legs?"
The transforming girl's eyes went wide. "I'm...I'm going to be a-"
"Yes!", the witch beamed, while Heather's own eyes nearly popped too. "You're going to be the most wonderful, happiest pony penis that ever was! You're going to guide Lib into making perfect love with Nadia, and give her some pretty babies!"
Olivia didn't know what to say. She tried to pull herself from Lib's shaft, but with no limbs, he remained stuck like the world's strangest popsicle. Plus, her gaping vagina had started to seal around Lib's big cock, keeping her fused to the stallion's shaft. Assuringly, Miss Angie placed a hand behind her back.
The touch made Olivia jitter. Although, not in a terrible way. "You feel that tickle?", said Angie, as she brushed the girl's skin, which was getting more and more sensitive. The little girl cooed.
"It feels wonderful, doesn't it?", Angie continued. Olivia nodded. Heather brought in her own hand, too, and started stroking her best friend's neck and face. Any fear on Olivia had departed, and now, Olivia was just enjoying the strange new sensations.
The girl's body was reshaping rapidly now, with Olivia's head being forced forward, and her neck thickening so much that Olivia could no longer turn to look at things. Her torso narrowed to match the new neck-size, while her nipples and belly button faded, Even her buttocks and anus were moulded away, to match the rest of Olivia's cylindrical form. Her brown skin turned a blacker shade from her former hips downwards, becoming coated in short, fine hair.
Not only that, Olivia felt the light, repeating thumps of another heartbeat. And that heartbeat soon went in sync with Olivia's. Or perhaps the other way around.
"That's Lib's," said Miss Angie, smiling. "You and your pony are sharing one heart now. Isn't that sweet?"
The changes had slowed down, and both Angie and Heather pulled away their hands, while Olivia took in her new self. Her head remained human, with her long curly hair and her human face. But everything else had faded into Lib's long, veiny and erect stallionhood. Olivia could feel the strange pulsing of her whole body, and the air tickling her sensitive surfaces. She could even feel the rolling of Lib's pony testicles, which the girl-turned-penis now figured was now part of her.
"Oh my god, you're a real dickie now!", exclaimed Heather, grinning at her friend's transformation. "You look so cool!...and really weird."
"T...thanks?," Olivia giggled. She didn't know how to take in all this. Since the day started, she had been expecting a fun day riding ponies with her best friend. She never imagined she'd be ride a pony as one of its body parts. And as his big pee-pee, even!
Still, Olivia couldn't deny that it felt good. She felt warm all over, and her head didn't feel heavy on her new body at all.
"You look absolutely perfect!" said Angie. "Oh, looks like Lib likes having you as part of him, too!"
Lib had stayed remarkably still during Olivia's fusion with him, but now, the pony stallion was stamping his front hooves again, and letting out a loud, lustful panting. Olivia felt her head bobbing up on its own, as her new form went stiff and hard.
"Easy, big boy," Miss Angie told the pony, petting on his belly. Sure enough, Lib settled down, and Olivia's dick-body softened slightly. Though Heather gave a playful poke on her friend's new body, causing her to bob up once again.
"I think Lib here's all set," said the witch, as the two girls giggled, and Heather continued feeling up her friend. "Now....let's go help Nadia!"