Hilda Reclasses to Centaur! [FE3H TF TG]

[This story occurs during the Verdant Wind chapter of Fire Emblem Three Houses, but does not contain any spoilers.]

"How do you do it, Marianne?" Hilda asked, regarding her friend's ability to communicate with animals.

"I'm not sure, I just… listen." Marianne replied, gently stroking the muzzle of Dorte the Horse.

Hilda signed. ‘Why won't Marianne give me as much time as she gives this smelly old horse? I love her more than anyone else… I need her…” Hilda thought to herself dejectedly.

As the two women stood in the stables together with Dorte, a sinister figure lurked in a nearby bush. An enemy spy had waited for the perfect moment to retreat with their gathered intel, and was about to escape on a horse: but then Hilda and Marianne appeared unexpectedly, ruining the spy’s opportunity for escape. In a hastily thought out and rather impatient plan, the spy cast Summon Horse in the direction of Dorte in an attempt to cause a distraction. However, the pink haired woman happened to stroll between the horse and the spy just as the spell had been cast. As a result, the magic struck Hilda instead of its intended target.

“Ack! What the heck was that!?” Hilda shrieked in surprise, but not pain. An immediate tingling sensation spread through her lower body.

“Hilda!” Marianne exclaimed in horror, concerned for her crush’s wellbeing. She cast a healing spell, but it had no effect - Hilda was already in perfect health.

“You!” Byleth’s voice rang out as she pulled the spy out of the shrub. Nobody had noticed the rather quiet professor passing through on one of her weekly walks, not even the spy. “Hilda, are you alright?”

“I… I think so, professor. What just…?” Hilda’s mind felt hazy.

“What did you cast on her?” Byleth demanded as she grabbed a nearby lead and tied up the spy.

“S-summon horse! I wanted to cause a ruckus, that’s all! I didn’t mean for it to hit her, I swear!” The spy cried.

“M-Mari, I feel dizzy…” Hilda stumbled over, but was caught by Marianne.

“What will happen to a human hit by that spell?” Byleth prodded the spy.

“I don’t know! I don’t know, I’ve never seen it cast on a person before!”

“Nnng, I take it back, I feel weird now…” Hilda muttered.

Marianne noticed a pink tail - not dissimilar to a horse's - poking out from Hilda's skirt. A second take revealed that her butt had also swelled to quite an impressive volume. It grew larger and larger, stretching out behind her and pulling her thighs back with it. It was as if another pair of legs were being separated from her existing ones!

"Nnng… N-neigh…?" Hilda could barely keep her balance.

“Hilda? Hilda!?” Marianne cried, holding the woman she loved steady.

The transforming lady’s stockings and shoes tore to shreds as her legs divided. Finally, Hilda lost the ability to stand properly, but Marianne managed to hold her upright. Her toes began to fuse together as her feet reformed themselves into hooves. Eventually, her legs finished splitting apart, leaving her with four legs.

“What’s h-happening to meee??” Hilda moaned as new and alarming sensations swirled through her.

With four hooves fully formed, she could now stand under her own power again. But when she stood up, she realised she was now about a foot taller than Marianne! Looking down at herself, she could see that her legs looked far more like those of a horse than an adorable lady.

“WHAT!?” She shrieked, fidgeting wildly in panic. Her still-growing ass slammed into a stable door as the disoriented transformee moved in a foreign body.

“Woah, Hilda! Woah! Easy, it’s alright! I’ve got you!” Marianne reassured, placing her soft hands on Hilda’s torso.

Hilda immediately felt a caring, loving warmth spread through her. Was this what animals felt when Marianne communed with them? Was this why they all loved her so much? Before she had time to process it, she noticed she had already calmed down and stopped flailing around. Her lower body was now as large and bulky as a horse’s, and was beginning to grow a thin coat of pink hair. She felt her tail flick against the stable door seemingly of its own volition.

Then, a process even more alarming began: Hilda felt a tightness between both pairs of legs! Between her front pair, her pussy sealed over and her clitoris dissolved into her body.

“Wh-what!? Where’d it go!?” Hilda screamed, patting her crotch and feeling nothing but muscle. Again she began to panic, but was quickly relieved once again by Marianne’s careful soothing.

“It’s alright Hilda… There there… Everything’s alright, I’m here for you…” Marianne cooed lovingly.

But that wasn’t the end of it. Between her hind legs, something began to grow…

This time, Hilda didn’t notice the changes as they were happening, save for an unusual pressure - but her mind was racing, too preoccupied to focus on the sensation. Soon enough, a dick had sprouted - and not just any dick, a horsecock! It continued to grow until Marianne, Byleth, and the spy all noticed it hanging there, gently bouncing with each subtle movement.

Byleth made certain the spy was tightly secured and disarmed, then rushed over to Hilda and Marianne. “Are you alright?”

“I… I feel weird… Professor, tell me it will all be okay…” Hilda lamented.

“Oh no…” Byleth muttered, taken aback.

“What? What is it!? Am I going to DIE!?” Hilda again fidgeted without realising it.

“What’s wrong, professor?” Marianne added.

“What’s wrong? Marianne, can you understand Hilda?”

Both Hilda’s and Marianne’s hearts sank simultaneously.

“Y-yes… can’t you?”

“No. All I’m hearing are horse-like winnies.” Byleth said with a sunken brow.

“WHAT!?” Hilda shieked, and began to kick as she pulled on her hair. She completely dislodged the stable door behind her in her frenzy, sending it flying backwards into a pile of hay.

Marianne did her best to sooth the ailing former human, eventually managing to calm her after several minutes.

“It’s alright Hilda, I can hear you. I understand what you’re saying. I’m here for you, I’ll help you. Shhh, it’s alright… It’s okay…”

"So, when you said you can speak to animals…" Byleth trailed off.

"Yes, I meant it." Marianne confirmed.

“I think I need to lie down…” Hilda said, kneeling down and lowering her body to the ground. As soon as her cock touched the ground, however, she became aware of it for the first time and sprung back to her feet with wide eyes. “Mari. Is what I think between my legs… between my legs?”

Marianne summoned all her emotional fortitude as she gently stroked a hand across Hilda’s silky pink coat. “Yes.”

Hilda did not, much to everyone’s surprise, buck in panic this time. She did, however, faint. Thankfully, she remained standing even while unconscious.

—

"...and that's what happened." Byleth finished.

The former students and teachers who joined the Alliance's war effort had all gathered in the courtyard for an emergency briefing.

"You know, if this was coming from anyone other than you Teach, I'd say that this must just be a poor excuse for a prank." Claude commented thoughtfully.

"Is it really that hard to believe?" Dorothea interjected. "I mean, we've seen people take other people's faces and become demonic beasts. Who knows what else is possible…"

"But I've never even heard of a 'Summon Horse' spell," Lysithea said, "let alone a summoning spell transforming someone. It's just not how summoning magic works!"

"So that probably means the spy was lying, right?" Leonie asked.

"Not necessarily." Claude scratched his chin. "There's a lot of forbidden magic the church banned from teaching, so we have no idea what's truly possible. Maybe that explains this mystery spell."

"Contemplating how it happened doesn't help Hilda right now, though." Sylvain added.

"True." Byleth agreed. "So far, Marianne is the only one who can understand Hilda in her new form. We need to see if anyone else can, too." The professor turned her attention to where Hilda was hiding. "You can come out now, Hilda."

Marianne gently opened the door to the old Golden Deer classroom, but Hilda remained hidden in the corner.

"Hilda? Are you ready?" Marianne asked gently.

"No! Everyone's going to laugh at me!" Hilda sobbed.

“The professor will make sure they won’t laugh.”

“Mari…” Hilda frowned. “I’m scared…”

Marianne hugged her love interest oh-so caringly. “I’m here for you.”

“Thank you…”

Hilda carefully peered around the door, then slowly emerged into the sunlight. Marianne had found a blanket to drape over her lower body so Hilda felt less exposed. But as if the universe were out to spite her, she stepped on a corner of the blanket, causing it to slide off her body.

“AAAAAA! MARIANNE PUT IT BACK ON! DON’T LOOK AT ME! AAAAAAAAAAAAAAAAAAAA!”

“I’m sorry!” Marianne hurriedly threw the blanket back over the centaur’s body, but it was too late. Everyone saw Hilda’s body.

“Huh…” Claude breathed.

“Oh…” Leonie gaped.

“Goddess, she’s hot,” Sylvain thought to himself - or so he believed. Once he noticed Lysithea, Bernadetta, and his boyfriend Felix all staring at him, he realised he spoke aloud. His face turned beet red.

“D-don’t look at me…” Hilda whimpered, averting her gaze to the ground.

“I don’t know about any of you, but I can’t understand what she’s saying.” Claude said after a moment.

“She said not to look at her…” Marianne spoke up. Hilda nodded in agreement.

“Awww, come on Hilda, what’s an extra pair of legs between friends?” Claude said with his special brand of shit-eating grin.

Hilda simply flipped the middle finger at him.

“Well, I understood THAT at least…” He added with a chuckle.

“Claude.” Byleth glared at him, shaking her head.

“Hilda, um, doesn’t want anyone to make fun of her…” Marianne tried to sound assertive. “And… Um, y-you should all just treat her like anyone else. Please.”

“Marianne’s right.” Dorothea affirmed. “Hilda’s going through enough as it is. The last thing she needs is for her friends to make this worse.”

“THANK you Doro.” Hilda gestured as she put emphasis on the word ‘thank.’

“She says thank you,” Marianne translated, smiling at Dorothea.

"Anyone else who can understand Hilda, say so now." Byleth continued.

Nobody said a word.

Tears began to well up in Hilda's eyes. Sensing her despair, Marianne gently stroked her some more.

—

That night, Marianne stayed with Hilda in the former classroom, which had hastily been rearranged to act as a more horse-sized bedroom. Three mattresses and a bundle of blankets had been set up for her on the floor in a far corner near a fireplace. At Hilda's request, some of the desks had been turned on their sides and arranged between the room's stone columns and around her bedding - she had the classroom to herself, but this just made it feel more private.

The centaur girl was already laying on her side under a mountain of blankets. Marianne sat by the fire, gently stoking it as she stared into the dancing flames.

"Hey… Mari?" Hilda said quietly.

"Yes?"

"Thanks for everything."

"It's nothing…" Marianne downplayed.

"No, it's not. Mari…" Hilda glanced up at her crush. "I'm so lonely… Now more than ever. Nobody can understand me but you. But…" She hesitated, then sighed. "Can you maybe… lie down? With me?"

"Oh!" Marianne blushed. "Y-yes! Of course."

Marianne laid casually over the covers next to Hilda, who in turn frowned.

“I’m sorry!” Marianne cried, getting to her feet. “Did I misinterpret what you want!?”

“N-no! I just- I mean, that thing you do! Where you touch me and sooth me! Your touch is intoxicating! I want you!” Hilda blurted as she stood up as well. “I need you! Oh Marianne I love you so much!” As soon as the words left her, Hilda flung her hands up to her face and covered her mouth.

“H-Hilda… Do you mean it? Do you really… love me?”

Hilda simply nodded her head.

“Oh Hilda! I love you too!”

Hilda perked up, her eyes wide and mouth agape. “WHAT!?” Both women couldn’t help but notice Hilda’s massive horsecock stiffen up.

“I’ve loved you for so long now!” Marianne smiled. "But I never thought you would ever feel the same…"

Hilda knelt down so she wasn't looming over Marianne, then hugged her tight. "Marianne, please never leave me! Don't abandon me! I need you! I've needed you since we first became friends!”

“Me too, Hilda!” Marianne had tears in her eyes.

“Does this mean… Do you wanna be girlfriends?”

“Of course I do! Oh Hilda… I’ve dreamt of this for years!”

“Really!? Even considering I’m, y’know…” Hilda gestured to her lower half. “...this?”

“Oh Hilda, you poor thing… I love you. I’ll be here for you no matter what, whether you’re human or part horse or anything!”

Both women had tears running down their cheeks as they sat and gazed into each other’s eyes. Marianne slowly inched her face closer to Hilda’s, but froze before making contact. Hilda, however, dived in and enthusiastically kissed her new girlfriend.

“Oh Hilda, I need you too! I want to make you so happy! I want to make you feel so good…” Marianne’s gaze fell. “You know, I’d be more than happy to touch you, considering you like it so much. I can even touch… other places, if you want…” She bit her lip lustfully.

“Oh Goddess YES.” Hilda bellowed wildly.

Marianne quickly stripped out of her dress and other clothes, then laid down on the makeshift bed. “Lay all your love on me~”

Hilda knelt over the prone lady, letting her dick rest on her warm skin. Being a centaur, her horsecock was almost as long as Marianne was tall, and had a girth to match. Wrapping her arms and legs around the massive member above her in a tight embrace, Marianne began to kiss the tip repeatedly.

“Nnng! YES! Oh Goddess, this feels so good!” Hilda cried in pleasure as she began humping.

Marianne’s whole body rocked back and forth with Hilda’s motions, basking in the wonderful sensation of such a huge cock pressing down on her. Precum was already leaking on her head and spluttering all over the covers. Marianne could feel each pulse and throb of Hilda’s gorgeous girlcock all over her body.

Hilda’s entire being surged with loving warmth from Marianne’s magical touch. Having an entire person clinging to her sensitive dick - let alone having a dick to begin with - overwhelmed the centaur woman on a foundational level. Plus, all that blood going to her cock made her feel a bit lightheaded, clearing her mind of clutter so that all she could comprehend was the pleasure building in her centaur parts. Her eyes rolled back a little as drool dripped down her chin. Speeding up her thrusts, the pink horse girl moaned unintelligibly.

Marianne’s whole body was hot now, and her hair was soaked in precum. Her animal connection ability told her that Hilda was already close to climax, and that she was too dazed to convey as much. Just as she squeezed even tighter, Marianne felt the giant member convulse and unload litres of centaur seed all over the bed and even onto the nearby wall.

“AH! NNNG! NEIGH! NEIGH! NNNG! AH! AH! NNNG!” Hilda panted as she painted everything in front of her a creamy white.

But she didn’t stop after a few seconds; in fact, she seemed to be spewing even more salty girlcum everywhere. Jizz ran down Hilda’s length and covered Marianne all over, surrounding her in the fruits of their love. Wave after blissful wave shot out from her new rod, completely drowning her enclosed bedding area in sticky centaur cum.

Finally, Hilda wound down and eventually stopped. The exhausted horse girl collapsed as she immediately fell into a deep sleep, crushing Marianne underneath her.

“Hilda! -Urk! S-so… tight!” Marianne futilely muttered, but couldn’t get enough air in her lungs to shout - not that it would do her any good. Hilda was out for the count. All the poor blue-haired lady could do was hug her lover’s cock and enjoy being topped by such a big, strong woman.

—

Weeks turned into months, and still there was no sign of any cure or other such means of reversing the spell cast on Hilda. But that was alright: she had grown to enjoy being a powerful centaur lady! Further, she had developed new teamwork methods in combat with Marianne, who became a valkyrie and rode Hilda into battle. Together, they were unstoppable: Hilda wielded an inhumanly large axe to cut down nearby foes while Marianne cast ranged attack spells and healing magic.

After the war, they got married and lived in happiness together for the rest of their days.