Horse Riding

by Bendy

Rating: mature
Tags: Romance, Anon, Porn, Second Person, Comedy, Sex, Twilight Sparkle, My Little Pony: Friendship is Magic, Human
Length: 8030

Twilight asks you many questions. At some point horse riding is brought up. She is intrigued by the concept.

Twilight asks you many questions. At some point horse riding is brought up. She is intrigued by the concept.

Co-Writers: primortal, Jackdark150820

Published 2021-09-20 18:30:02 UTC
Last updated 2021-09-26 21:44:47 UTC

Riding The Pony

Nestled deep within a huge ass oak tree there was a cute, little purple unicorn. She asked you so… so many questions. However, you were very eager to answer them since she promised you a meaty steak as part of a ‘friendship lesson’ or something like that. Whatever the case may be, you were getting steak. You were getting pretty sick of eating vegetarian food. You wore a fancy black tuxedo for this interview.

You, the human were sitting upon a wooden stool. Across from you, on the other side of a circular wooden table was said unicorn, who was known as Twilight Sparkle. Her horn was glowing deep pink as she held a book in her magical grasp. While at the same time, floating above her book, she held a black-feathered quill pen at the ready.

“So, you mentioned earlier that you have ponies in your world. But they are far more ugly and stupid when compared to us.”

“Yeah, what about it?” you asked.

“How do humans interact with these ponies?”

“Well, Twilight. It depends on what country the ponies are in. Ponies are seen as animals for children’s entertainment in the form of horse riding where I am from.”

“Horse riding? I know what a horse is, that’s a slur to insult ponies. But I don’t get the riding part.”

“Before I answer. Can I ask why the word ‘horse’ is a slur?”

“Well, it means you are ugly basically to call somepony a horse.” her ears folded backward, as a look of worry crossed her face. “You don’t think of me like a horse, right?”

You reached your right hand out to her and began to tenderly scratch the back of her ear. Twilight in response moaned softly, and her tongue lolled out of her mouth. “Th… that… feels nice.” she shook her head, before she flashed her horn, and gently pushed your hand away. “That was nice but distracting. Let’s get back on track. You were going to tell me what horse riding was.”

“Horse riding is when a human rides around a horse’s back. Horses have been used by humans as the fastest form of transportation on land for thousands of years. It only became surpassed with the invention of the car.”

“Ah, I see. I’ll question further on what a car is later,” Twilight stood up, and turned around to show you her backside. Your eyes widen at the sight. Despite her being significantly shorter than you, this cute little horsey was packing a very shapely, plump bubblebutt. Her tail obscured her assets. “But right now, I want to see if we could try out some horse riding.”

You made to stand up, and moved to stand behind her. Her plump ass perfectly met your hips at the same level. It was just the right height to ‘ride her’ in another way. You found yourself increasingly attracted to these ponies. While they had small tits between their back hind legs, they more than made up for it with their plump asses that put any human woman to shame.

Twilight looked back at you, with a big cheesy smile upon her face. She eagerly awaited you to mount her. With all that considered, you suddenly found yourself nervous about this. Twilight seemed to pick up on your hesitation.

“Are you okay, Anon?” she asked softly.

“Yeah, give me a sec,” you took a deep breath, before you stepped forward over the small unicorn, and then you gently made to sit down upon her back. Your feet made contact with the wooden floor underneath, Twilight was a bit too short to ride. On a side note, the softness of her velvety fur was wonderful. For some reason or another Twilight moaned in bliss the moment you sat down upon her back.

Twilight giggled with a hoof over her mouth. “You seem too tall. I won’t be able to have you ride around on my back without your shoes scraping the floor,” her eyes shrunk to pinpricks when she felt something long and hard poke her back. “Did you just get an erection?!” she bellowed in alarm.

Your face went red like a tomato in embarrassment like a true gammon. You proceeded forth to stand up in order to stop your massive cock from poking her back. You turned around to hide your shame protruding inside your pants. “I’m sorry, Twilight. I didn’t mean to get an erection. I’ll just go now,” you said in a low voice.

You made to walk away, but you stopped when you felt a soft hoof take hold of your right hand. You turned around to face Twilight, who was smiling at you as she held your hand with her hoof. Her hoof was flexible as it lay curled around your own appendage

“Would you like a steak, beer, and a blowjob? And then we can mate for science, and then I could write a letter to Princess Celestia for a friendship lesson report.”

“I would be delighted, Twilight. But could I ride around your back for a little longer?”

“Sure, hop on.”

You stepped forward and sat yourself down upon her back. You then leaned forward, and rested your head upon her soft mane. Your cock felt tight in your pants as it poked her back through your pants. Forthwith you began to kiss her neck, earning yourself a happy whinny from her.

You reached your right hand back to her rump, and delivered a hard slap upon her cheek. Twilight’s body shivered as she moaned loudly, bucking her legs instinctively. “Oh Celestia… what did you do?!” she asked, panting hard.

“Uhhh… slapped your butt?” you asked, blushing. You suddenly could smell a distinct aroma, like lilacs and lavender. ‘Did she just- ?’ came your thoughts, before being cut off.

“That can’t be it, I’ve been hit there before… no, it had to be… MY CUTIE MARK!!” she realized, looking at where her luscious rump still stung. Silence pervaded between the two of you as this realization sank in. The unicorn then simply smirked.

Twilight lit up her horn with magic, and locked the front door. You yelped when your clothes vanished out of thin air, leaving you naked atop the mare. Your massive cock was now free from the tight confines of your pants. It was well above 10 inches, far surpassing any pornstar you've ever seen. It must have been at least twenty inches long, if not more so.

You shuddered at the softness of her fur against your bare skin. Twilight stared back at your massive cock resting upon her back. “Like what you see?” she joked as she looked over your meaty rod intensively.

“Yeah, you’re a real sexy little horsey.”

She giggled. “Can we skip the foreplay? I want you to mount me raw.”

You made to stand up, and positioned yourself behind Twilight. Her tail was wagging from side to side in excitement. Her soaking marehood was winking at your cock in greeting.

Twilight made to walk backward, and pushed you up against a wall. Your huge cock came to hotdog the cheeks of her ass. You brought your hands down, and lay them upon her cutie marks. Your hands sank into the plush softness of her rear, before they made contact with the strong muscles underneath.

Twilight took a few steps forward, to allow your long cock room to mount her. Your massive cock was now perfectly aligned with her marehood. Twilight stared back at you with a pleading doggy eye look, begging for you to mount her.

This told you all you needed to know, so with one fell swoop you pushed forward, and slammed your cock into her. The mare cried out as your huge cock came pounding into her pussy. You grunted as you clenched your jaw from the sheer tightness of her pussy. Slowly, you pushed forward as inch, after inch of your long cock gradually made its way inside her.

Moans, groans, and horsey sounds left the mare before you, as you slowly drove your cock into her. Eventually, your cock slammed home all the way into her pussy. Your balls came to slap against her buttcheeks with a loud meaty slapping sound of flesh slapping against flesh.

Her lovely, soft rump felt wonderful against your body. A strong wave of heat emitted off her marehood. Her pussy clenched hard around your massive invader, trying to milk you for your seed.

Twilight leaned her head back towards you as if she was trying to kiss you. You leaned down over the mare and brought your lips to hers. The two of you moaned in bliss as you kissed. You lightly thrust your hips against her as you kissed, pulling back only by an inch or two.

Twilight uttered a muffled cry of pure bliss during your kiss from the feel of your massive cock pistoning against her backside. You felt a tingling feeling in your cock, you were close to release already. The mare whined sadly when you abruptly stopped kissing her. You pulled back to near the point of exiting her, and then you came slamming back home deep inside her, before unleashing inside her with a loud moan.

Your hands resting on her cutie marks glowed with blinding light for a brief moment, before her cutie marks in turn did the same. A blinding light, accompanied by your pony lover howling in orgasm, overtook your vision as you felt Twilight’s butt seemingly… ‘inflate’.

“Huh?” you asked aloud as you feel your body being pushed up, or maybe pulled up, as Twilight’s height increased. When the light dissipated, you were now hugging onto the huge ass of a tall alicorn.

“What… what just happened?” asked a confused Twilight Sparkle as she almost got vertigo from the sudden change in perspective. She almost fell over, unused to the weight shifts and longer legs. The only thing keeping her from taking a tumble, was you still latched onto her backside.

The wings also kind of freaked the poor former-unicorn out. “How… how did this happen?!” she squeaked, trying to cope with these new sensations.

Twilight’s massive rump dominated your vision. It was much larger than even Princess Celestia’s rump. It was almost beach-ball like in appearance. Twilight herself was tall and imposing. She towered in the air, standing possibly at least 7 feet tall. Your hands sank deeply into the extra thickness of her rump’s soft cheeks. Your softening cock below came to slip out of her marehood.

“Well, at least I can ride on your back properly now,” you said, giving her buttcheeks a tender rubbing with both of your hands.

Twilight giggled. “You want to get on my back again and ride me?”

As if in answer, your cock rose back to attention, standing tall and proud once again.

“Dearest Princess Celestia, Today I learned that having a human riding around your back feels great. It felt even better when he rode me from behind with his massive cock. Background magic seems to be affecting his reproductive organ. Must investigate more thoroughly. His cum seems to have an empowering effect on me. I’ve become an alicorn, and gotten quite big. I think I’m even bigger than you, Celestia.”

“Your faithful student, Twilight Sparkle.”

Celestia giggled as she rolled the scroll back up. “Good to know that I’m not the only one who’s realized this fact. Can’t wait to see what… comes of this study.” she said as she sipped her tea.

Celestia found herself suddenly sad, as a tear went down her cheek. Her human love, Commander John Shepard from a thousand years ago was no longer with her. His soul was bound to the dream world. Only at night in her dreams could she see her love with the help of Princess Luna. Her human love too was the one who made her an alicorn.

Celestia frowned at the prospect of being surpassed in size. If Twilight is telling the truth, she now has the biggest rump in all of Equestria. She made a mental note to feed on this love from the human herself so she can have the bigger rump once more.

“Just you wait, Twilight. I will have the bigger rump. Nopony has a bigger rump than Princess Celestia. I have the best rump on the Citadel,” she said in a low, bitter voice.

Loving Your Ride

The huge, tall, and imposing mare known as Twilight Sparkle stood before you with her back facing you, and what back she had. This gave you a perfect view of her massive, fat rump pressed against you. A dark shadow loomed over you from its great mass. You were not afraid in the least, despite the substantial size difference between you and her. Your back was pushed against a hard, wooden wall from behind you. You knew Twilight was a gentle mare, there was no need to be afraid. Her bubbly rump seemed like a bloated beachball. Under normal circumstances, she should be able to crush you with the heavy weight of her body pushed against you. Clearly, there was some magic protecting you from her tremendous weight from breaking your body.

Your big horsey love with packing heavy loads back there. Any BBW human woman back home on Earth could not match the sheer weight and heavy thickness of Twilight’s gargantuan rump. What’s more, her crotch-tits seemed to have gotten substantially larger during her growth spurt. Each one of her tits between her back hind legs was about the size of a watermelon at the very least. Twilight now had the best of both worlds, a massive ass along with huge tits combined, and you could look at the two of them at the same time from standing behind her.

Your head rested upon her right buttcheek, it sank deeply into the plush softness of her fat, bubbly rear. You lovingly kissed and licked her plump cheek, causing the mare before you to sigh, moan, and make a series of horsey sounds in pure bliss.

In addition, you used both of your hands to massage the warm softness of her rear. Your hand sank deeply into the thick, squishy softness of her bountiful flesh from her backside. The sheer thickness of her cheeks meant you were not able to fully wrap your hands around it. Your hands barely reached her cutie marks on either side of her expansive cheeks.

Your huge cock stood to attention within the wide canyon gap between her buttcheeks. They felt marvelous for your massive cock to be hotdogged between her heavy, warm softness. Down below, upon your lower shaft, you could feel her marehood convulsing against your rod, soaking it with her creamy essence. The heavy cheeks of her ass lovingly squeezed your cock between their wonderful, pillowy softness.

Heaven, absolute heaven you were experiencing having such an amazing ass pressed against you. It felt warm and soft to the touch, your hands sinking deeply into her cheeks like memory foam. The softness of her velvety fur pressed against your bare skin only increased the feeling.

Experimentally you pulled your right hand back and watched the depression on her cheeks rapidly fade away and return into a perfectly smooth shape. You pressed your hand back down and watched in delight as it sank deeply into her squishy soft flesh.

You were overwhelmed by the sheer beauty of her massive ass. Tears began to fall down your cheeks, and they subsequently landed on her buttcheek. In response, Twilight’s cutie marks glowed with blinding light and her body began to inch upward into the air. At the same time, her buttcheeks began to inflate outward like a car’s emergency airbags, and push you even harder against the wall behind you. You uttered a muffled cry out in pure bliss into her bubbly cheek pressed against your face as you were getting even more fat horse ass in your face.

“Mmmmm! Yes! Worship my ass!” Twilight cried out at the feeling of her cheeks rapidly expanding across her library. She began to grind her ass against you, her little human lover, pressing her heavy, and growing weight against you. You hissed in pain from the weight of her heavy backside, but you were no worse for wear. It seemed there was protection magic in place that got stronger automatically. Her air ballooning buttcheeks pushed you against the wall behind you as they were hyperinflating. You uttered a muffled cry of pure bliss at the feel of her growing ass pushing against your body.

Her buttcheeks soon came pushing against nearby bookshelves from either side of her, threatening to knock them over. Each one of your tears falling upon her cheek caused Twilight to gain several inches in height.

Her bookshelves were soon knocked over by her rapidly expanding buttcheeks, sending books flying everywhere. The sight of seeing her books being in such a mess caused the huge mare to gasp in shock, which took her out of her sexual euphoria.

So, with a flash from her horn, she stopped her growth with a counterspell and reversed her growth. It seemed Twilight didn't want to grow any bigger and remain at her current size. This had the peculiar effect of her ass air ballooning outward for a few seconds before it subsequently shrank back down to normal size, before air ballooning outward again, and then shrinking back down again, and so on. Twilight was quite literally fighting against the growth you were giving her from your tears of joy.

You didn’t mind. She had more than enough thick ass already. No need for anymore. She was at the size you could fuck her properly without going overboard. You wiped away your tears, and thus Twilight’s growth came to a stop. “Twilight, can I ride on your back again?”

Without a word, the mare took a few steps forward, and leaned forward, arching her back and shoulders down to the floor. This however had the consequence of raising her massive ass even higher into the air from this new position. Your jaw dropped at its sheer beauty. She giggled happily as she looked back at you. She then unfolded her wings, and spread them out, this only made her even sexier.

You walked to the right side of the leaning mare. Without a word, you made to sit down upon her upper back and then leaned forward to begin kissing her neck and mane. This earned you some heated moans from the large equine, along with some happy whinnies and other horsey sounds.

The mare subsequently stood up onto her full, mighty height. “Anon, you want to go for a romantic walk with me while you sit on my back?” she asked, staring back at you with a look of hope in her eyes.

“I’d loved to, Twilight,” you said softly, while tenderly rubbing her neck and mane with your hand.

Twilight pursed her lips for a kiss, leaning her head towards your own. However, she could not reach you. The mare whimpered sadly, tears filling her eyes as she looked down at you with pleading puppy dog eyes, along with her ears drooping sadly. You felt butterflies flow through your stomach at the cute sight. For such a big horsey she was incredibly cute, not to mention very sexy.

You soon answered her plea, and climbed up further up her neck, and reached upward to kiss her. The mare sighed happily and closed her eyes upon the feel of your human lips against her own. As for you, her warm and soft equine lips felt slightly fuzzy against your own. The two of you uttered muffled moans of pure bliss as you lovingly kissed one another. The romantic walk she planned to take you on can happen later.

You reached your right hand up and laid it upon her cheek. From there, you began to gently stroke her cheek up and down with your hand with loving tenderness. Twilight’s cheeks lit up with a blushing pink color from this affectionate gesture.

At some point, the mare uttered a muffled giggle, before she brought her large equine tongue into your mouth. She completely dominated your far smaller human tongue. Her long, thick tongue swirled wildly about in your mouth. You could only lick the underside of her thick wet muscle for the most part. Nonetheless, you were enjoying yourself having your mouth ravaged by the large mare.

You and Twilight shared a passionate kiss for quite some time. Before eventually the two of you pulled away, a bridge of your saliva connected your departing lips. The mare stared back down at you with warmth in her huge, purple eyes.

You could not help but reach your right hand up, and begin to gently scratch the back of her ear. At the same time you used your left hand to begin gently rubbing her mane with long tender strokes.

Twilight uttered a deep throaty moan in response to this. Forthwith, the mare began to gently lick your face with her long, thick equine tongue. You were undeterred and continued to give Twilight loving affection with your hands by petting her mane, and scratching her ear. Twilight moaned in bliss as you gave her tender love while she licked you.

Twilight walked backward to lean her massive ass against a wall for support. With herself safely secured, she reached her right hoof back between her hindquarters and subsequently began to feverishly masturbate. Wet, fleshy sloshing sounds could be heard as her hoof rubbed against her meaty pussy.

Twilight closed her eyes, and unleashed a loud horsey neigh. Her tongue came to loll lazily to the side due to her distracting sexual euphoria. You used this opportunity to begin lovingly licking her neck. You were now scratching her ear, petting her mane, and licking her neck at the same time. The mare you showered with affection cried out in pure ecstasy, her thick, and meaty hips came to slam repeatedly against the wall behind you. The shock waves from the impacts from her heavy rump hitting the wall behind her caused bookshelves to fall over. Dust and debris fell from the ceiling. In addition to that, this caused her cheeks to smack against one another with loud, meaty slapping sounds of flesh slapping against flesh.

The mare craned her neck back and uttered a loud whinny as a torrent of her marecum came blasting out of her marehood like that of a shotgun, spraying the wall behind her with thick globs of her creamy essence. Repeatedly orgasm after orgasm rocked her body from your loving affection. Some part of you wondered how this was scientifically possible for a magical pony to get off with ear scratches, pets, and licks.

But then you remembered the magical pony part, so the whole science thing is mostly moot here. Whatever the case may be, this was a magical experience for both you and her. Nothing could ruin this tender moment.

Suddenly, Pinkie Pie spontaneously appeared out of thin air in front of Twilight with a big smile on her face. Twilight yelped, and jumped several feet into the air, before soon dropping back down again. The heavy impact of her tremendous hooves hit the floor with a loud crash that left deep craters in it.

“Hey Pinkie,” you said, giving her a wave.

“Hi Anony!” she said, giving you a wave with her right hoof with five pink fingers on it. You closed your eyes and did a double-take. When you opened your eyes again, it appeared her hoof was back to normal with no fingers.

“How did you get in here?! I locked all the doors of the house, and----” Twilight stopped speaking when she realized how stupid her question was, since it was Pinkie Pie. “Never mind,” she grumbled angrily.

“Well silly, my Pinkie Sense kind of went off like a bomb when it detected you had become an alicorn. Naturally, I had to phase through the walls of your house to investigate.”

“How are you able to go through solid objects without---” Twilight cut herself off, realising she was asking another stupid question.

Twilight nearly jumped into the air again when she felt Pinkie Pie feeling up her left buttcheek. Pinkie pressed her hooves into the thick, bubbly softness of her luscious rear. Her hooves sank into the deep layers of squishy soft fat like that of memory foam. “Twilight, you got the biggest ass I have ever seen,” she giggled, giving her cutie mark upon her plump cheek a lick with her long, thick equine tongue. “Hehe, I think Princess Celestia is going to be jealous with this super dee duper rump you now have.”

Twilight blushed profusely. “Well, it and my body seem to actually get even bigger if Anon cries upon it. I can only assume it will expand even further if he cums inside me again. I had to cast counterspells to stop my growing body from destroying my library.”

Pinkie Pie gasped in shock. “Heresy! Why would you stop your big fat sexy booty from getting bigger?! Bigger is better after all.”

“Because I don't like the idea of having my ass avalanche across Equestria. Despite the fact, my body does not seem to hurt Anon, and I assume others even with increased weight. I like to keep my passionate relations with Anon private. I don't think I could even perceive his penis if I went full supernova in growth on top of him.”

“Awwww! You're no fun!" grumbled Pinkie Pie, crossing her hooves as she stared with narrowed, angry eyes at Twilight’s rump. “Ass! You could be much bigger and sexier! But Twilight is holding you back from your true potential! You could be an enormous bouncy castle of an ass for everypony to have fun on it as they bounce upon it!” she shouted.

Teaching Your Ride

You, the human, were mounted atop your tall and mighty alicorn steed known as Twilight Sparkle. Pinkie Pie stood next to Twilight’s right flank, glaring angrily at her massive rump, wishing it could be even bigger. However, Pinkie Pie's anger with Twilight’s rump did not last long. She began to drool profusely at the sight of her enormous cheeks.

“I can’t stay mad at you,” Pinkie said to Twilight’s butt, giving her right buttcheek a soft kiss with a well-defined smooching sound. “Can I eat out your pussy?”

“Oh, of course, you can Pinkie,” she said, turning to look back at Pinkie to give her a broad smile.

Pinkie moved to stand behind Twilight's massive buttcheeks. From there she leaned forward and pressed her head between her heavy cheeks, and began to feverishly lick out her marehood with her long and thick tongue. Twilight craned her neck back and cried out in pure bliss at the feel of Pinkie's tongue licking her needy sex. You only added to Twilight’s pleasure by petting her mane with your left hand, along with scratching her right ear with your right hand.

Twilight cried out a loud horsey whinny, she could not last long from under tender loving. Thus she unleashed a monsoon of marecum upon Pinkie Pie eating her out, soaking the mare behind her in thick globs of her white creamy essence. In no time at all, she was little more than a snowpony, covered from head to hoof in a thick coating of white cum.

Twilight sighed deeply in bliss. “Anon, you have my permission to engage in sexual intercourse with Pinkie Pie. I want to see if she will be affected the same way as I was by your love.”

“Yay!” shouted Pinkie Pie from behind her.

Getting down off Twilight was going to be an issue. She was a very tall mare. This issue was soon fixed with Twilight simply laying down on the floor. Pinkie hopped onto Twilight’s back and took you into a gentle hug. The mare began to lovingly nuzzle your neck. Her two front, soft spongy feeling hooves came to wrap around your waist. Your penis stood tall and proud between your legs and it came to poke her soft furry belly. Your hands came down to grasp her thick, bubbly flanks, sinking deeply into their squishy softness.

“Here comes Pinkie!” she said shouting, thankfully her voice was muffled in your shoulder.

Pinkie hoisted herself over your cock, and in one fell swoop, she dropped herself down and took your thick, long member all the way inside her. You buried your head into Pinkie’s shoulder to quiet your scream of pure bliss from the feel of her powerful marehood clamping down hard on your cock.

Pinkie Pie began to bounce her lovely fat rump up and down upon your lap, giggling as she did so. Meaty slapping sounds could be heard as her lovely rump smacked against you. You were excited at the prospect of Pinkie Pie growing bigger. The sight of Pinkie Pie's ass air ballooning in growth in your mind was enough to push you over the edge.

So with a muffled cry into her shoulder, you subsequently unleashed into her, blasting her insides with massive amounts of your creamy essence.

“Woooo! Anon is cumming inside me! I bet I’m going to get big too!” shouted Pinkie Pie excitedly, a big cheesy smile coming upon her face.

Spurt, after spurt of your creamy human spunk, blasted into Pinkie Pie. When the last of your seed unleashed inside her, you gave Pinkie a soft kiss on the lips. Your softening member came to slip out of her. However, you were taken aback when it appeared Pinkie Pie was upset. Her lower lip began to quiver, and tears began to fall down her cheeks. Her hair lost its puffiness and became smooth, and her fur became a darker shade of pink.

“What’s wrong Pinkie?” you asked softly, tenderly rubbing the back of her mane.

“I-I…. did… I didn’t grow bigger?” she said in a low voice.

“I’m sorry Pinkie. I think Anon only affects me with growth,” said Twilight.

“I wanted a big bouncy castle of an ass! Everypony could have fun bouncing on it!” Pinkie wailed in grief and buried her head into your shoulder.

You began to leave a series of kisses on the distraught mare’s neck. Along with petting her mane at the same time. “There there, Pinkie. You are still a sexy mare.”

The mare lifted her head and looked at you with hope in her eyes. “I am?” she said in a low voice.

“Yeah, size isn’t everything.”

A big happy smile came upon her face, her hair regained its puffiness, and she made a squeaking sound like a dog's chew toy. Her fur regained its bright pink color.

“How about we go for that walk?” said Twilight.

“Can I come?” asked Pinkie Pie.

“Err, later. Pinkie Pie, I want some alone time with Anon.”

“Awww!” she whined sadly.

“Sorry, Pinkie. I’ll make it up to you at some point,” you said, giving her mane a tender pet.

Pinkie Pie crossed her hooves, and huffed, and spoke in a grumpy tone. “The best way you can make it up to me is finding a way to make my ass air balloon in growth so I can become a true balloon butt. I want a massive bouncy castle ass. It’s not fair that only Twilight gets bigger from your love.”

“We’ll try again in the future,” you turned to face Twilight. “Let's go for that walk.” Twilight made to walk to the front door, leaving the library a complete mess. “Uhhh, should we clean up the library?” you asked.

“Eh! Spike will clean it up,” she said dismissively, waving her right hoof nonchalantly.

Twilight made it halfway through the front door before her thick, bubbly flanks got her stuck in the doorway. Her ass was too fat.

Twilight blushed profusely. “I don't want everybody seeing my big fat ass right now. Can we do this walk somewhere more private?”

“Yeah, sure.”

With the flash, Twilight teleported you and herself into the middle of the woods. The Everfree Forest to be exact. It was quite dark and creepy in these woods.

“Isn’t this place dangerous?” you asked in a worried tone.

“Not to brag Anon, but I'm basically a demigod thanks to you. I am nigh-invulnerable as an alicorn. I think I'm the most dangerous thing in this forest. Now, let's go for this walk. No animal will not dare to approach.”

Twilight demonstrated her point by casually lifting a massive boulder up off the forest floor with her right hoof. This boulder was about half the size of her body, and she was holding it up above her head with not even a hint of struggle. She then subsequently slammed the boulder against her forehead. It shattered into dust upon impact against her. She was completely unfazed, and not a scratch was left on her.

“You are… are a strong pony,” you said in awe.

True to Twilight's word, everything in the forest kept a wide berth from her as she walked through the forest with you on her back.

You and Twilight’s bond was growing more and more as you rode upon her. She is still very interested in horse riding, which gave you an idea. So you had Twilight magically create a set of riding tack just for herself, which is black, that made Twilight look very sexy in your view.

You and Twilight are alone in an open, long grassy area within the forest, Twilight wore a riding tack, which includes a saddle with stirrups, a bitless bridle with reins attached to it that rested on Twilight’s neck, they are all black in color.

She summoned a pair of clothes for you to wear, which consisted of a white T-shirt with a black outline of a lightning bolt, and dark blue shorts. You also wore a pair of riding boots with spurs attached to them. You have a crop in your hand as well.

You saw that Twilight looked uncomfortable, “Umm . . . Anon, do I really have to w-wear . . . this?” Twilight asked nervously.

You smiled as you walked up to her, as she lowered her head to your level and you patted her head, then leaned in, “I think you look sexy as my big beautiful mare.” You whispered before blowing into her ear.

Twilight shivered as you blew into her ear, “O-okay.” Twilight said softly.

You smiled, “That’s the spirit, now Twilight, if you want to be a good riding horse, then you must follow some basic rules.” You explained making her nod in response.

“First; You must always make sure to be ready for when your rider wants to mount you.” You explained as you walked to her left side with her head following you.

“Why?”

“Because they can mount you in case they need to get away quickly or just want to have some fun, like this!” You shouted as you jumped up and landed on the saddle.

Twilight simply snorted in reaction as she was unfazed by your weight. “You forget, I’m a demigod, my love. But I'll humour you.”

Twilight went back in time and allowed you to jump on her back again. You were completely unaware of this, however. You were made to forget what had just transpired.

This time, Twilight stumbled forward a bit, before she found her balance and kept herself on all fours, as you slipped your feet into the stirrups and grabbed hold of the reins.

Twilight turned her head to look at you with an annoyed expression, “Now do you get what I mean?” You asked.

“Yeah, now I do. Thanks for that by the way.” Twilight replied sarcastically. Although, she was only playing along to keep her love happy. She was not annoyed in the least. She wanted to make him feel he was in charge, but in reality, it's her who is in charge.

“You're welcome, but you must always make sure that when your rider wants a ride, you must make sure to be ready to be mounted.” You leaned forward, “And you must also be ready for me to mount you the other way.” You whispered in a hot tone making Twilight moan slightly and nod in response.

You leaned back then patted her head, “Good girl.” You said making Twilight roll her eyes slightly.

“So what’s the next step?” Twilight asked.

“Yes, the next step is when your rider wants you to move, and they usually do this, by either swishing the reins or tapping their heels into their mounts sides.” You explained as you swished the reins, then you gently tapped Twilight’s barrel with the spurs making her gasp slightly, “There is one last way to make their mount move.” You added on.

“And what way is that?” Twilight asked while facing straight ahead. Unknown to you, she spoke in her mind. “Please let it be slapping my ass!”

You smirked as you raised your hand in the air, and swung in down slapping her huge ass making her whinny in happiness and sprint forward, “Whoa, girl! Woah!” You ordered as you pulled the reins back as Twilight stopped, but she reared up, neighed, and paws the air with her hooves.

You slowly dropped the reins as Twilight dropped down to all fours, snorted, and shook her head a few times, but she immediately blushed at what she just did and smiled sheepishly. “Heh, sorry. Let me cast a spell to make sure you are protected if you fall off me.”

Her horn lit up with a glow, and a flash hit your body. “There, you are safe now.”

“Thanks, Twily, but I think I would have been fine, I do have stirrups and I’m able to hold the reins, but better to be safe than sorry.” You replied.

Twilight nodded her head in response, “Also do riders in your world really slap their asses to get them moving?” Twilight asked with a raised eyebrow. “Not that I mind, you are free to slap my ass all you want.”

“Heheheh, well, they don’t use their bare hands, they use either a crop or whip.” You answered while scratching your cheek, slowly with one finger.

You saw Twilight’s whole face go red as she turned forward again, “Oh . . . oh, I see. I am a little worried that you could trigger a growth spurt.”

“How? By using a whip or crop?” You asked confused.

“I’m not sure. Just a theory.”

“Well in that case I won’t use a whip or crop then.” You replied as you slipped the crop you were holding into your back pocket.

Twilight giggled. “Unfortunately, I love you, Anon.”

“I love you, too, my big sexy mare,” you said softly, petting her mane. This gave her a mini growth spurt, as she gained about two inches, but due to the two of them having their moment neither of them noticed.

“And the final rule is the most important rule of the three.” You explained.

“What is it?” Twilight asked.

“It’s that you must obey me at all times. When I tug on the reins, you must follow the direction.” You tugged the reins left to the right making Twilight turn her head in the directions obediently, “Also when I tug the reins up, you must rear up.” You continued.

“Why would I need to rear up?” Twilight asked. However, in her own thoughts, she said. “I will do anything for you my love.” Despite the substantial power, and not to mention the size difference between you and her, she was more than willing to play the part of a submissive mare if it made you happy. The immortal alicorn found this roleplaying fun to do with her mortal lover.

“For fun.” You answered simply, making Twilight giggle at your response, “As well as obeying your rider you must trust your rider no matter what.” You explained in a fairly serious tone, to tell her that you're serious (Well not so serious but she doesn’t need to know that)

“Ummm . . . why must the mount obey their rider at all times?” Twilight asked.

“Because the rider steers the mount, he makes sure that they are going on the right path, the mount just has to carry their rider at all times.” You explained.

“But what if the mount doesn’t like what the rider does?” Twilight asked with a slightly scared expression, you can tell that she’s talking about you doing something that she won’t like.

You rubbed her neck making her sigh softly, “Twilight you know I would never hurt you, you know that right?” Twilight nodded at your question, “Then you should know that I only care about making sure that you won’t get hurt, as I’ve said, you must trust your rider at all times.” You explained as you continued to rub her neck.

Twilight nodded while sighing happily at your rubs. You withdrew your hand making her groan slightly at the loss, “Now that you know all of the steps, let’s see if you do good on a field practice as good as listening.” You explained with a smirk.

Twilight pretended to look offended, “My human Anon, I can be just as good on the field as well as inside.” Twilight replied in a fake offended tone.

Your smirk grew, “I’ll be the judge of that.” You said as Twilight turned forward, “Hi-ho Twilight away!” You shouted as you tapped her barrel with the spurs, causing Twilight to rear up, and neigh and paw the air with her hooves.

When she came back down she galloped around the field. You enjoyed riding Twilight around the area, it made you feel like you're back at home, but this felt better because you can talk to the mount since they listen to you and they can respond.

Once you had your fun and pulled the reins to a halt, making Twilight stop, she turned her head to look at you, as you gently stroked her muzzle with your outer palm making her lean into your touch with a happy sigh.

“I love you Anon.”

“And I love you too Twily.”

You and Twilight leaned forward as your lips connected, both of you showing the amount of love and affection for each other by this one kiss, suddenly you felt Twilight shaking underneath you as you withdrew, then she suddenly grew in size, snapping her whole riding tack off her back and face.

When the saddle snapped you fell along with it and you landed on the ground with an ‘Oomph.’ However, the pain was nullified by the spell she cast earlier.

When you looked up, you were gobsmacked because Twilight grew so large that she’s basically the size of an elephant at the very least in your world, if not even greater. Perhaps, several times the size of one. Twilight was now so tall that she was basically a giraffe. She must have been at least 20 feet tall. Her former beachball-like buttcheeks were almost hot air balloon-like in appearance at this point. You were pretty sure you no longer had a big enough dick for this extra-large mare now.

The weight of her hooves pressed down hard on the earth below. Her hooves sank into the dirt deeply from her tremendous weight. You were glad Twilight seemed to have weight protection magic, otherwise, this super heavy pony would be dangerous to approach. You were not intimidated in the least, Twilight was a gentle giant mare.

Twilight smiled sheepishly, her face blushing profusely as she looked back at you. “Oh, sorry about that. Do you want me to shrink myself back down again?”

You stumbled onto your feet and voiced your objection. “Twilight. You’re as big as a house! A big sexy house.”

“Hehehe! You want this big butt?” the mare giggled with a hoof over her mouth, and began to shake her massive, jiggly rump from side to side. This created a thunderous clapping sound as her gargantuan buttcheek slapped against one another with loud, meaty slapping sounds of flesh slapping against flesh. This had the added consequence of her massive, beach-ball-like crotch-tits slapping each other, creating additional meaty slapping sounds. A river of marecum was flowing out of her marehood, creating a pool of her creamy essence underneath her.

As Twilight continued to shake her ass from side to side. She lifted one of her front right hooves, and reached back to her huge backside, and pressed it against her right cutie mark. You watched in delight as her heavy hoof sank into the plush softness of her ass, her hoof’s applied pressure created a deep depression upon her buttcheek. She held her hoof there for a good few seconds before releasing it. Subsequently her cheek soon resumed its perfectly smooth shape when she pulled her hoof away.

“You're one big sexy mare!” you shouted, raising your hands in praise.

Twilight giggled, before dropping her ass hard down upon the ground below, this created a deep crater in the earth from the heavy impact of her massive backside. “You wanna make this mare even bigger by cumming between my cheeks?”

Twilight’s buttcheeks were now so wide, you could be encased by the bubbly softness of her ass on either side. Before you could venture forth and cum inside her however you heard a pair of flapping wings from behind you.

Twilight gasped in shock, and shrank back down to 7 feet tall with a flash from her horn. “Princess Celestia?! What are you doing here?”

You turned around to see it was indeed Princess Celestia. She had a bemused smile on her face.

“I see Anon showed you the magic of friendship. But can I have the magic of friendship too?” she said, making to land before you.

Twilight made to stand up, and turned around to hide her cum drenched backside. “I don’t think it will work. He tried cumming inside Pinkie Pie before we went out, and nothing happened.”

Celestia uttered a low whimper. Tears began to fall down her cheeks. “Butt….. Butt….. Butt… Butt… I had the biggest butt? Who will think of me as a leader if my butt is smaller than yours?” she said in a low voice, looking at the taller alicorn before her.

“What is it with you ponies and your obsession with butts? Get over yourself, Princess Celestia. You still have a lovely fat ass, I will gladly fuck it.”

“But Twilight’s butt is bigger…. and it grows bigger when you cum inside it. How am I supposed to compete with that? What if all my royal guards turn on me and mount Twilight instead of me? Now, I know exactly how Luna feels with a smaller butt.”

Twilight spread out her wings. “Nobody is allowed to mount me from behind, other than Anon. I am his faithful steed. I will need Anon’s help if some evil shows up. I will need him to cum inside me so I can face the next villain, and facesit on them into submission. They will struggle to lift my magnificent backside to no avail, I will only lift my massive butt off their face when they change their ways and reform.”

“Oh, Twilight. I’m so sorry! I can’t stay mad at you! Not with such a wonderful ass to keep Equestria safe from evil!” she shouted, she made to trot around her, and embrace her ass, and bury her face between her buttcheeks. Her hooves sank into the plush softness of Twilight’s bountiful backside. You joined Celestia and placed your hands on Twilight's right buttcheek. Your hands sank into the squishy softness of Twilight’s backside.

You were pretty sure you were going to have many big booty adventures with Twilight. But right now, you just wanted to embrace her ass alongside Celestia during this tender butt moment.