Twilight's spell gone wrong.
In a giant castle outside of Ponyville, you rest on a couch. You had been in Equestria for about a year now and you got have a mixed opinion on the place, the creatures(mostly ponies)are very friendly, the environment was pleasent and plenty of hot chicks(or mares)but there are a lot of downsides. No tv, meat, other humans and other minor things. However you managed to score yourself a mare, that mare was named Twilight Sparkle. She was purple, had a mane and tail that were a darker purple, and a big butt that jiggles every time she walks, also on each buttcheek(or flank)had a marking on in called a cutie mark.
Just then, your train of thought was interrupted by the voice of your marefriend.
"Anon" she said in a sexy voice "I see you look a bit saddened, why don't i chear you up a little."
With that she turned around, showing off her speciality, her big plump bubble butt.
"So you want to have fun don't you Twilight." You said as you got up. You then put one hand on her left buttcheek, you loved the feeling of your hands digging into the squishy fat on Twilight's booty, you then raised your right hand and slapped her on her right buttcheek, Twilight moaned in pleasure as her cheeks clapped together, with that you began groping and spanking her.
"Don't stop Anon, I've been very naughty." Twilight said as you continued to spank.
after many hard slaps on her ass, Twilight let out one loud moan. "That was amazing Anon." She said.
"I'm glad you liked it, Anyway Twibutt I'm gonna head off", You left Twilight's castle to go to your own house, it was a small wooden cabin with a simple bed, closet and bathroom. You took off your shoes and sat on the bed. Beside you was a large collection of pictures taken off your sexy Marefriend. One picture was her wearing a par of panties that Rarity helped her make and a picture of you rubbing her butt in your face. You loved everything about her.
The next morning, Twilight woke up. Ready to see her Boyfriend again, however she wanted to do something a bit different, she wanted to make her appearance be a lot sexier then usual. But she didn't really know how, so she went to look through her spell book to see if she could find anything good. "Let's see", she said. Hoping to find a good spell. There we're a lot of different spells to make her look different.
"What kinda of spell is this", Twilight said as she saw a spell that she never saw before. It was some kind of spell that will make her appear different, but how would it. The spell only said "Your body will go under big changes" Twilight liked the sound of it and decided to use it. "Here goes nothing", she said as her horn lit up.
"Nothing" she said, sound very disappointed. "This spell changed nothing about me, so much for big changes."
Shortly after there was a knock at the castle door, Twilight knew it was Anon and made her way to the door and opened it.
"Hey there sexy", you said. "Oh, hey Anon", she replied in a rather upset voice. You we're confused when you heard her sound like that. "Everything okay Twilight", "Of course I'm okay Anon, what makes you think I'm not okay?"
"Twilight, you can't lie to me. I know when someone is telling the truth or not." Twilight knew she couldn't lie to Anon, he was very good at telling that somepony (or in this case someone) was lying to him. So she had to tell the truth. "Anon, I tried to use a spell to make myself look sexier for you and it didn't work." "What, why did you do that." You asked as you we're a bit confused.
"Anon, I just feel like one day your going to loose interest in me"
"Why do you think that Twilight" you said still sounding confused.
"Well Anon, I'm starting to think that if you see me with this body almost everyday, you may not find me sexy anymore"
"Don't say that Twilight, I think you will always be sexy, I love your body just the way it is, your big eyes, wonderful mane, and an ass so big, I can just bounce a quarter off of it" You told her, Twilight blushed about what you said.
"You really think that Anon."
"Yes I do Twilight, yes I do" you said, Twilight then gave you a big hug
"Oh thank you Anon."
You then put your hands on her butt and grope both of her butt cheeks, which suprised her but then she let out another loud moan
"I know you like that Twilight." you say as you grope harder
Then, Anon saw Twilight's cutie marks glowing
"What the hell, Twilight is that normal."
"What is?" She woundered
"Your cutie marks are glowing!"
Twilight turned her head back and saw both of her cutie marks glowing like LED lights.
"I don't know what's happening"
Then, you could here light hissing and stretching, almost like a balloon inflating, not just that you felt our fingers being pushed away from Twilight's ass
"What the hell?"
Twilight looked back again to see her butt was inflating.
"OH MY CELESTIA, MY FLANK IS GROWING"
You felt your fingers being pushed away from her butt, you took your hands off of it, witch began to make it grow faster
"WHY IS THIS HAPPENING?" She shouted, then she remembered the spell, dhe remembered how the spell said "Your body will under go big changes" Twilight tjen realised as her butt got bigger and bigger.
"I need to figure out how to stop it"
She ran to the room she left the spell book in, only for her inflating butt to get her stuck in the door.
"Oh come on!" She said as she tried to firce her way through" You looked at Twilight's bloating rear, feeling both turned on and confused.
"A little help Anon!"
"Oh, sorry babe" you walked up and eventully pushed her ass through the door, she gkt her hoofs in tje book and quickly stopped the spell, her butt stopped inflating.
"Thank Celestia it's over.......how bad is it Anon"
You looked at her butt, both buttcheeks had grown to the size of chairs
"So big I can sit on them" you say as you give her butt a big slap
"EEP" Twilight went "Well...at least you still like it"
"I always will babe.....can you.....sit on my face" you asl her
"Are you sure" Twilight asked, my butt's so big the rest of my body looks so small"
"Do it babe"
And just like that, you layed down and Twilight sat on your face.
The end