With Great Power Comes Great Tits

by Ichiro Sato

Rating: mature
Tags: My Little Pony: Friendship is Magic, Spike, Comedy, Romance, Sex, Twilight Sparkle, Princess Celestia, Human, Princess Luna
Length: 2395

Becoming a princess was an interesting affair for a pony Twilight. In a humanized setting, even moreso for the perverse.

A newly crowned Twilight Sparkle is having some trouble adjusting to the changes that come with some of the physical changes of becoming a princess.

Hint: It's not having wings

(Humanized Spike and Twilight shipping)

Published 2014-02-18 21:40:13 UTC
Last updated 2014-02-18 21:40:13 UTC

Responsibility? What?

Author's Note

Warning: Story contains minor breast expansion, lactation, and (implied) impregnation. If you are object or offended by these things depicted in an sexual manner, please hit the 'back' button now.

This story was basically a fit of writing I did on 4chan's /mlp/ some time ago during the hiatus. I am publishing it here to err on the safe side (of remaining within FiMchan's rules so I can keep my pastebin linked in my profile) rather than leave it public on my pastebin. For fans of the original, I have done my best to make sure the story is as much the same as it had been on pastebin. If these minor changes still infuriate you, keep watching the boards of /mlp/ (unless you are under 18, in which case, I firmly and sternly would remind you not to) for the next time the original link is posted again.

Responsibility? What?

She had been warned about this, warned by Princess Celestia, by Princess Luna, she had been warned by Cadence! And yet, she didn't listen to any of them for once in her life and now, she found herself painfully uncomfortable, awkward, horny, and breathless in the middle of a delicate social function. Given the lattermost was caused by her bra being a good size and a half too small for her budding bosom, it was like puberty all over again but without the acne, the braces, the coke bottle glasses, the orthopedic underwear, and actually being generous to her (to her surprising dismay) instead of the A cup copout she finally "blossomed" into at fifteen.

But that did not bother her have as much as the hunger. Her belly felt empty even if her new state of being since her ascension saw her put away have the banquet table, and she itched between her thighs, always. To put it bluntly, she was ready to jump anyone, almost anything were she not in public, and trying not to cause problems for the Kingdom.

"Ah! Miss- Or should I say Princess Twilight Sparkle! What an honor to meet you and congratulations on your exaltation!" The Saltan of Saddle Arabia greeted with a smile and extended a hand.

Twilight kept up her facade of pleasantries, chatting right back, only breaking her poker face when the handshake caused a bra hook to finally give out. Thankfully, the ruler seemed not to notice, or at least was too polite too. (if the latter, he definitely earned himself high points on the "fuck priority" list)

Shaking her head from those thoughts (causing the brassier to completely give out) she discreetly rushed to her mentor who just glanced at her and smirked. "You didn't buy new bras, did you?"

The former student just bashfully nodded in response. "Well, go to your chambers and fix yourself up, Luna, dear sister, if you could help our newest peer."

The Princess of the Night didn't even look away from her argument over defense budgeteering before spiriting Twilight away with her magic to her chambers in the castle.

"Ugh, I am not going back out there!" The new princess groaned and flopped onto her bed, pausing only briefly to strip herself of her fancy gown and her busted breast support, moaning slightly as the fabrics of each article seemed to brush her nipples just the right way.

She did nothing to fight the pleasure, in this sanctuary, she embraced it and cupped her budding breasts to rub them for pleasure and free them from soreness. "How much bigger does being a princess make me?" Twilight asked aloud though the desire to know or even remembering she asked was washed away when her fingertips grazed her teats, instead opting to pursue the electrifying sensations she could give to herself. "Maybe..." Twilight panted, continuing to play with her breasts. "Maybe I could learn to like being like this." It was a consideration appaling to the old, plain, magical student Twilight, but to the ascended, Princess Twilight, the odd thought of giving herself entirely to her sexual desires seemed extremely tempting when she could make herself feel good without even getting to her slit.

Which, as she whimpered and writhed on the bed, soaked her panties and clung the fabric to her folds.

Deciding to tend to her needs, she left one hand slide sensually down, smooth and slow across the skin of her empty, flat, tummy until her delicate fingers could slip under the fabric and grazed her clitoris.

The reaction was instant, the pleasure overwhelming. Lights danced behind Twilight Sparkle's eyes, a shockwave of raw magic sent the contents of the room flying, and her scream was carried with the outburst as an orgasm blazed inside of her as the witch panted, moaned, and mewled.

After several seconds of riding the waves of pleasure, Twilight fell back to her bed, her breaths ragged and uneven, heart slamming against her ribcage at incredible rates. After several moments of silence, she squeezed her own breast and blinked. They had swollen even bigger, putting her somewhere into the once-mythical-to-her-realm of being a full D cup.

"I think I could really get used to this..." She said woozily, her reprieve shattered with a vase that hit the floor from a careless (and potentially soon, dead) soul bumping into it. And immediately calmed when she noticed her own number one assistant, wearing part of his attire as a makeshift blindfold. Suddenly, she felt very hungry and empty again.

"Spiiiike." Twilight said to the dragonborn in a sultry, bedroom tone while sashaying towards him and halting his retreat by draping her arms around him.

"T-Twilight! I swear! I saw nothing! I mean I heard a lot but that's because I couldn't make earplugs and I'm sorry! I was just in the bathroo-"

She shushed him and began to guide the self-blinded teenager to the bed.

"Want to do more than just see and hear, Spike?" She asked him as she playfully pulled off his blindfold.

“Twiligh-” Spike was silenced once more as his surrogate sister pressed his face into her warm breasts. The new princess discreetly grinned as she felt the heat rise in her assistant’s cheeks and something begin to peak below his waist. But after a few moments of dumb silence, she started to frown. “Spike… When a horny girl puts you into her boobs, you could at least nuzzl-ahh!”

She nearly jumped into the roof (literally, damn ascension powers) and somehow managed to slow the descent for them both to land on top of them bed, despite feeling a long, rouge, and adroit tongue actually squeezing one of her nipples and sharp, hard fangs scrapping the her areola. The heat was quickly building back up in her belly, along the longing and sense of emptiness inside.

She needed to be closer, she needed to feel his flesh against hers, inside of her. She couldn’t focus enough to use magic, so instead the newest royal tore the dragonborn’s clothes straight off his back and ripped her silken panties away.

To Twilight’s frustration, Spike did take notice of this and paused his makeout session with her swollen chest to lament: “Those were the only clothes I had.”

Still, the new princess just smiled and pulled the assistant close, whispering “Then let’s stay in here awhile.” before bringing Spike into a long, sloppy kiss, her hips beginning to grind against him when she felt him grow almost as aroused as her, and he would press himself to her in kind.

Their tongues slid against one another, slipping past eachother’s lips, allowing Twilight to nearly cut herself along Spike’s canines. All a distraction while Twilight’s hands mischievously slipped lower and lower on her assistant’s body and snuck between them to feel his erection.

Spike brought their kiss and let out something between a moan and a growl as he trembled in his adoptive sister’s fingers. When he looked into her amethyst eyes again, his own were now lit with a primal flame that caused Twilight’s heart to soar and body to ache in need.

A more literal fire flickered between his lips as his instincts took over “Spike… Want.”

Twilight just smiled, spreading her legs and lower lips. “Then come and take your princess, dragon.”

He didn’t need any further prompting, he all but lunged at her in a way that made his lover squeal with delight but nearly laugh he missed their target. But any giggles Twilight would have had at Spike’s expense were cut short when he bit down on her neck instead and pulled on the soft flesh with teeth and suction while thrusting himself over her entrance and rubbing across her clitoris with each stroke.

She stretched her neck to accommodate him, her back arched, and her hands grabbed his hips, pressing the princess tighter against those strokes while in the back of her mind she wanted to scream at Spike for his teasing.

This wasn’t her at all. Princess Celestia warned there would be changes, but where once the idea of sex itself was simply an academic read or at most a flip through some smutty novel she couldn’t get through without turning bright red and throwing such books away, she just wanted to scream at her own, young assistant vulgar commands to take her. Claim her.

Impregnate her.

As she finally realized why she felt so sorely empty and what she wanted to fill it, a small part of herself wanted to protest, but even “the old Twilight” couldn’t deny this euphoria.

Her thoughts were interrupted when said bliss lulled and paused, she looked up and saw Spike, the desire of his instincts still burning in his eyes but overwhelmed with his gentler true self. “Twi-Twilight, should I stop? You look sad.”

A small gesture that made her heart soar again. Twilight wrapped her arms around her back and pulled her number one assistant- her lover close. “It’s okay, Spike. I want this now. I want you.” She whispered, running her fingers reassuringly through his green hair. If ever she were to give herself to any man, she thought and parted her legs more, it was this one who always stood by her.

After she urged him up, she wrapped one hand around his length and giggled when she was rewarded with a few dollops of precum. “Ye-yeah. Laugh it up miss ‘I nearly cum from getting reverse hotdogged’.” Taunted the dragonborn in a deliberately childish tone.

With only a grin as his warning, he pushed his hips forward while still in her hand, burying his tip inside Twilight. Twilight immediately gasped and bucked, instinctively wanting this sudden, painful, yet wonderful feeling to fill her whole body while her draconic lover doubled over, his whole body shuddering as he fought the urge to climax then and there. He held on, but the first string of seed splattered inside of Twilight and only encouraged her more.

She no longer fought her libido, instead pushing Spike backwards so she could ride him, albeit barely as the pleasure continued to overwhelm her, forcing her to pause. Each time he was pushed inside of her and shook, she felt a sense of fulfillment, and on each draw she felt an aching need no matter how small the drawback had been.

Meanwhile Spike had seized Twilight’s hips, both from his own need to remain buried near her core and give him some control over the rhythms. His hips moved in small circles with each movement the princess made to stab against different points inside of her.

And Twilight noticed, and every so often, Spike would end up hitting a small spot in her walls that made her almost cry with the pleasure it send ripping through her body. But despite all this pleasure that left her mind in a numb haze, she felt she was denying herself her own orgasm. Why was not an answer she could come up with, only urging her to demand more from her number one assistant.

And ever dutiful, the dragonborn managed to sit himself up once again, his warm lips found her nipples and gave them the same treatment he had given her neck before. But on the more sensitive flesh, Twilight Sparkle found herself gradually paralyzed from the ecstasy of the wondrous sensation of sharp teeth scraping against her and Spike’s shaft appraising her inner walls.

A familiar sensation overtook her. The Princess’ mind became blank except for the wonderful bliss and haze that took over her thoughts and vision. Then she felt the rush of seed mingling with her liquid heat and locked herself as tightly as possible, her instincts commanding her not to let a single drop of Spike’s sperm escape.

By the time the lustful veil had been lifted, she realized she was sprawled on the bed, breathing hard, Spike was still buried inside of her, and happily sucking on her breasts. Noticing her coming to, the dragonborn looked up and greeted her with a smile of his sopping lips.

“Well, good morning, Princess.”

Morning already?

“Spike, what’s dripping from your mouth?” Twilight couldn’t help but ask and her answer was a clawed finger pointing to her leaking nipples.

“Just trying to keep you from getting backed up.” Spike smirked and licked away the milk.

So, she was a cow now, it was a thing. Lovely. At least she could now think clearly enough to snark internally.

“Well if you don’t want me backed up, mind pulling out?” Twilight teased and kissed her assistant’s cheek but wrapped her legs around him when she felt him move. “By the way, I was joking about the pulling out part. Are you still cumming?” she asked when she felt something viscous and warm leaking inside of her.

Her answer was a blushing nod from her companion.

The princess just smiled and pulled him closer. “Think you could get me to come for hours on end too?” It was a request Spike was happy to at least try to fulfill.

Becoming a princess was and would continue to be an adjustment for Twilight, in body, mind, and spirit, and no doubt she would be adjusting for a long time to come. But she had her friends to support her, the other princesses to guide her, and Spike to give her love.