Spike smiled and walked over to Celestia, his hands stripping off his clothes as he went. First his shirt, then his trousers, letting his dick spring free and stand erect for the Princess and her guards to see. Out of the corner of his eye, he saw that both Twilight and Rarity were also stripping down, but Spike was drawn to Celestia’s slight whimper of her lip as she gazed at his mast standing erect before her.

“It is truly a magnificent thing,” Celestia said in awe, falling to her throne before Spike and beckoning Spike forward with one hand, whilst the other continued to stroke herself to his magnificent dick. “It overshadows all others and is even better than I remember. Spike, may I be privileged enough to touch it?”

“Only if you call me Master. And start talking about your little gifts,” Spike ordered, taking the opportunity to openly leer at the Princess of Equestria. He could feel his heart beating a mile a minute from the temptation to lunge at the two huge tits being offered for him, perhaps the largest pair of tits in Equestria. “And if you make sure your student and Mistress are attended to."

Looking to Rarity and Twilight and then to her scantily dressed guards, the Princess snapped her fingers at the latter. "Slaves, Twilight, and Mistress Rarity require your attention. See to it that their needs are attended to.”

There was a loud clattering sound as the shields and spears of the guards crashed to the floor as the scantily clad guards made their way over to Twilight and Rarity. Their armour was useless, sometimes the straps of gold were thinner than jewellery with thin fabrics barely covering their private parts.

“You’re so kind Master,” Twilight said as she eyed the guard approaching her. “Let’s see if Gleaming’s hard work paid off.”

Their lips met, whilst at the same time Rarity pushed her own guard into her chest before their lips could meet. “Ah, ah, only a certain few get the privilege to kiss me. But do not despair, my lovely little slut, you may still have a taste of the most delicious tits in the whole world.”

“Mmpf.” The guard groaned as she was smothered between Rarity’s sexy tits. But Spike’s attention was drawn to the Princess before him. The one who had prepared Equestria for him to have his way with, as she also offered her body to him to do the same.

“Nice job with the guards. Did Gleaming help with that?” Spike asked as he towered over Celestia’s throne. Celestia nodded, her eyes fixated on his cock.

“Master, may I touch your dick now? May I have the honor to serve your cock, Master Spike?” Celestia begged, a desperate look in her eyes as her fingers hovered mere inches from his dick.

“Give me your throne and you may.” Spike said. In the next instant, through some sleight of hand that Spike could not quite understand, he was soon lightly shoved onto Celestia’s throne with the graceful Princess kneeling before him. Delicate hands prodded and worked his cock, priming him for its service.

“The throne fits you, Master, far better than my fat ass does,” she purred, her smoldering look of worship stirring an arousing sensation in Spike’s chest. “And almost as good as my huge, juicy tits fit around your cock.”

Spike smiled, as he gestured for the Princess to continue. Soon enough he found his cock engulfed in a vast ocean of white flesh. They were warm, like that of a pleasant summer day, the comfortable heat almost acting almost like the sensation of a warm bath.

“You like to degrade yourself with your dirty talk. When did that happen?” Spike grunted as he lifted his hips up and down, trying to push his dick through Celestia’s cleavage.

“Sometime shortly after I declared myself the Slutprincess of Servitude, seemed an apt name, having set up Equestria to fall under your sway like a house of cards.” Celestia purred as she mashed her tits against his cock in her titjob.

Spike noticed how she had referred to herself as the ‘Slutprincess of Servitude’ rather than the ‘Princess of the Sun’ but decided to approach the subject later. “So what did this Slutprincess of Servitude do?”

Celestia considered her options for a moment, hundreds of options seemed to come to her mind. She had many acts to choose from it seemed, all in service to her Dragon Master, eventually she chose one. “A few decades after Nightmare Moon was banished, Equestria had a few powerful nobles who wanted us to enact slavery as so many other nations had, naturally, there was some resistance to this idea.”

Spike could tell that Celestia leading to something interesting. “Go on.”

"Eventually it was left to me to arbitrate and I was able to pull a lovely little trick over everypony. You see, the nobles said they were ‘good slavemasters’. Absurd, of course, since the only good slavemaster is the Master I see before me, but it was a lie I stoked.” Celestia explained, a smug confidence simmered in her eyes and an evil grin on her face. “Publicly, I made a compromise. Slavery would be tolerated, only after I or any other Princess ensured the Master was ‘good’. Behind closed doors I assured those corrupt bastards that I would approve their every request.”

“I’m guessing that didn’t happen.” Spike said. Celestia licked the tip of his cock as it popped up through her cleavage, shaking her head slightly with pride.

"No, in fact, those nobles soon found their requests were all rejected, regardless of the noble or reason, and soon they realized the trick. The nobles, abolitionists, and history all thought I had tricked the nobles into abolishing the practice whilst pretending to be on those corrupt nobles' side." Celestia's smile became sly and wicked. "But nopony ever asked me to repeal that law, so it remains to this day a lovely little loophole. A power any Princess could still use."

Celestia looked straight into Spike's eye, almost challenging him to order her to do exactly that. She pressed her tits harder against Spike's, tempo increasing. Her horn lit up, the golden magic stimulating the Princess's own pussy with a golden copy of her Dragon Master's cock, thrusting into her pussy, priming herself to cum from her titfuck. "Would you like that, Master? To have you own us in the eyes of the law? To strip our rights away and turn us into your fuckdolls? You could do that with anypony, I'd always be willing to agree! You could make any mare your slave with my signature! Even me!”

“I’m going to cum!” Spike growled, placing his hands around her tits, mashing them against his cock, and increasing his pace. Celestia cooed in delight and mirrored his efforts.

“Please, Master Spike! Please paint my tits with your cum! Let me wear your spunk as I rule Equestria in your name!”

It was all too much for Spike, and his cum exploded all over Celestia’s famous tits, soaking into her fur and settling there. Celestia followed suit in her own orgasm, staining the base of her own throne in her cum.

“It’s an honor to wear your cum on my chest, Master Spike." Celestia said, her voice filled with conviction. "But, I imagine you want to claim my pussy now? Perhaps you’d like to hear more stories about the corruption of Equestria?”

“Gladly.” Spike said, standing on his feet. Before him, Celestia willingly bent forward, swaying her white ass in front of Spike. He could smell her pussy growing ever more eager.

“Fill me up Master, claim the Princess of Equestria as your own personal slut.” Celestia cooed, twerking her ass seductively.

Spike spread her pussy with his thumbs. It was warm, warm like the sun, simply inviting Spike to plunge into her. But instead, he spanked her ass with his hand.

“AHH!”

“This is a good ass, not as good as your sister’s, your tits are better though. But if you want the privilege of me fucking you, then I want to hear about another one of these preparations you’ve done.” Spike teased mauling the fleshy ass before him.

“You want to hear about how I pulled the same trick several generations later? Mortal ponies are so forgetful, so I did the same thing with prima nocte, but only a position an ‘Equestrian Master’ can do. There are no Equestrian Masters yet but you could be the first.” Celestia boasted, her wicked pride too much for Spike to resist and he plunged into her. Her cunt was shaped perfectly for his cock, probably from generations of fucking herself with imitations of his cock.

"You're such a good slave." Spike growled and pumped inside of her. His scales slapped against her fleshy ass, as his claws reached forward to maul her famous tits. His cum had set in by now, making her breasts shine like diamonds, as Celestia moaned like an angel.

"Tha-thank you, Master! That's why I call myself the Slutprincess of Servitude!" Celestia squealed, her voice carrying a tone of pride at her title.

"Thought you were Princess of the Sun?" Spike asked, not slowing his pace in the slightest as his cock explored her body.

"If Cadence can be the Princess of Lust, why can't I be the Slutprincess of Servitude Master? We alicorns are all natural sluts, as I'm sure Twilight can attest to."

Her eyes flickered over to Twilight who was now being fingered by her guard, even as she ate out Rarity who sat on her face. She was in no position to respond, only able to give a muffled groan of affirmation.

"I think that means yes, Spikey." Rarity said with a smirk.

Spike got an idea, he leaned in closely to Celestia's ear, his cock now completely dominating the alicorn. The goddess of the sun was completely dominated by his cock and he whispered into her ear. "When I cum inside you will you gain new powers fitting a Slutprincess of Servitude? And will these powers allow you to serve me all the better?"

"Let's find out Master Spike." She said with an excited smile. Spike filled her pussy with his cum and watched the transformation begin.

Author's Note

Another voting time again, though I'm also eager to hear ideas as to what new powers Celestia should receive as the Princess of Servitude. I also hope people liked some of the changes Celestia has made, so it's possible for her to reveal new preparations over the course of the story.

Straw Poll for next Character: https://strawpoll.com/05ZdWBbE8g6

Crowdfunding for Future Artwork here: https://ko-fi.com/darkstar239

Any suggestions, feedback, and constructive criticism are welcome.