Prude
It was a lovely sunny day outside, but you didn't really care since your favourite thing in this pony town was a sexy lavender unicorn, who was standing in front of you at her study in her library. You were situated upstairs with her in the Golden Oak Library. You were only dressed in a pair of brown sandals and white underpants. This society was nudist, so you should not be wearing anything at all.
Anyway, today was finally the day you asked her out. It took you a while to summon up the courage to ask your unicorn friend Twilight Sparkle out. You might be a little dense, but even your feeble human mind could comprehend that Twilight had feelings for you. Especially after that 'just friends' spooning session last night, that was really weird. Knowing that she clearly had feelings for you, it helped you in your endeavour immensely.
Things quickly escalated from there, for she was a very forward mare. Just mere moments after asking her out, she magically pulled down your pants and began to suck you off. Your cock was still lubricated from the whole experience.
As of right now, your beloved Twilight Sparkle was presenting you with her plump backside. Her tail was wagging excitedly back and forth. It was somewhat surreal to see her looking at a book in front of her at a book stand. She wanted you to have sex with her while she read a book.
You shrugged your shoulders, and with nothing else for it, you pulled down your underpants and tossed them aside. You then approached the mare and lay your hands upon her plump rear. Your hands sank into the warm, soft fat of her thick rump like a soft marshmallow, creating wonderful deep depressions into her bubbly buttcheeks. Deep beneath the thick layers of plush fat, you could feel her ironclad muscles underneath.
Experimentally, you pulled your right hand back and watched as the depression you made quickly faded away, followed by her rump returning to a perfectly smooth shape like a still lake. You then placed your right hand back down and watched it sink into the plush abyss of her fat ass.
You stumbled as you found yourself pushed back when Twilight's buttcheeks abruptly grew in size as if they were an emergency car airbag. This sudden migration of fat into her ass caused her asscheeks to clap together with a loud, meaty slapping sound of flesh slapping against flesh. Her ass jiggled about like a stormy ocean before settling into place.
Your jaw dropped at the sight of Twilight becoming much larger than before. Twilight's buttcheeks were now practically two twin beach balls in front of you. They were massive bubbly spheres of flesh begging for love. Your hands sank deeper than ever into her super thick cheeks. She put any human woman's ass to shame. Twilight was now practically the size of the draft horse breed known as a shire horse at this point, butt on steroids. Your former four feet tall Twilight love was gone, replaced with a Twilight with a massive dump truck of an ass. And… she could get even bigger if she wanted to with magic.
Twilight looked back at you with a hoof over her mouth and giggled. "Heheheh! I made myself temporarily larger for you with a growth spell. Is it too much? Or do you want even more ass, friend?" she asked sweetly in her beautiful voice.
You tried to speak, but all that came out of your mouth was an incomprehensible mumble. You were ass-tonished by such an ass. This prompted Twilight to giggle with a hoof over her mouth.
"Hehe. I can make your cock bigger too. Would you like that, my friend? she asked, looking back at you with bedroom eyes.
With that, you went mad with lust and brought your cock between her fat bubbly pony cheeks and pressed forward. Your cock was enveloped with warmth and softness as her plump bubbly cheeks hugged it, and upon your cock entering her marehood, you began to tear up from the feeling. Twilight's absolutely beautiful marehood snuggled your cock with the warm, wet softness of her slick sex.
You pushed as far as you could go, but you simply did not have enough cock to fully enter her; a great deal of your cock was snuggled by the warmth and softness of her thick buttcheeks hugging it.
Nonetheless, Twilight was clearly enjoying herself. The mare was moaning quietly as she read her book in front of her while at the same time frantically squeezing her marehood upon your cock. The mare also gently rocked her hips back and forth, causing her fat bubbly cheeks to clap with a loud, meaty slap repeatedly. In addition the squeezing of her marehood caused you to moan in bliss at the feeling. However, you were not moving; something didn't feel right.
"This is wrong, Twilight. What would Jesus think?" you said in a low sad voice.
Twilight's ears flickered. She shook her head, seemingly dismissing what she heard from you, and continued rocking her hips back and forth against you. That fat ass of hers continuously bumped against your body, bombarding your body with the warmth and softness of her ass. While doing this, the thunderous clap of her fat cheeks could be heard.
"Stop it, Twilight! This isn't right! Jesus is watching! You are taking me away from the light of Jesus!" you shouted with your hands in the air. Upon hearing this, Twilight stopped rocking her hips and looked back at you as if she had a stroke, her right eye twitching.
"What?!" she said sharply, looking at you with her eyes narrowed to slits.
"You are an evil succubus taking me away from the light of Jesus. I'm a proud god-fearing Christian man, and I will not give into the temptation of your big fat pony ass."
"Anon, what in Tartarus is wrong with you?" she shouted.
There then came a blinding flash of light. Jesus himself has now descended from heaven and looked at you with a frown on his face. Lord Jesus floated above Twilight, looking down at you with judgment in his eyes.
"Anon, don't be such a prude. As your Lord and Savior, I command you to tap that ass," the son of God spoke in a commanding voice while pointing with his right hand at Twilight's fat ass.
You nodded. Jesus himself approved of human on pony action; who are you to deny the will of God? And so, you stopped being such a stupid prude and embraced the big fat pony butt.
END