Author's Note

Twilight Sparkle X King Thorax.

This story contains the following fetishes: Vaginal Sex and Oviposition.

In the name of Science!

"Okay, everything is set! Now to just wait for their arrival!"

Thorax expected an entourage of armed guards, but what he got was far more simple, if a bit unorthodox. There was a sudden crackle of purplish magic and then poof! All four princesses suddenly manifested in a bright violet light that very briefly blinded him.

"Uggggh, that was... hard," Twilight Sparkle said as she held a hoof to her head which now throbbed in pain. "Next time, we'll just fly here," she slipped down and sat on her haunches. "Teleporting Cadence was one thing, but all three of you just makes that spell very very difficult to cast."

Princess Celestia gave Twilight a proud smile, "But you did it, don't let that accomplishment slip away just because of how hard it was. I can't really recollect any of us ever being able to teleport three alicorns." The Princess of the Sun giggled and was quick to add, "But then, I can barely teleport myself. Too scared of putting myself in a wall," she admitted before stepping away.

Princess Luna nodded in agreement of her sister's words, "It is true, Twilight Sparkle." She turned to face the Princess of Friendship and offered her an amorous grin, "Lets hope your pain quickly recedes, less you'll be the one having to do all the work."

Princess Cadence laughed, rubbing a hoof against the back of Twilight's head comfortingly, "I wouldn't worry, I know a few spells to renew one's vigor." She then leaned down and whispered into Twilight's ear, "Just ask Shining Armor, he knows all about it," then slipped away with a chortle to join Luna and Celestia who were approaching Thorax.

Thorax rubbed the back of his head in confusion, "Well, it's certainly nice to see you all again so soon." He waved a fore hoof toward the large table littered with delicacies of which mostly consisted of common, but finely prepared Equestrian dishes. "Sorry, we don't really need to eat, so I did my best," the changeling king murmured with a heavy blush.

Celestia curtsied and gave Thorax an approving smile, "It shall do just fine, King of the Changelings. It'll taste wonderful after we've finished business."

Luna nodded to her sister, then turned to Thorax, "Agreed, we should tend to the matter at hoof. I am quite sure the physicality of our affair will give us quite the appetite."

Thorax looked confused, straining to comprehend Luna's words. Twilight noted this and quickly jumped in to elaborate.

"She's talking about coitus... copulation," the lavender unicorn explained, but still saw the changeling king lost in a cloud. "Oh gosh, ... none of you told him?," Twilight turned to the other three princesses with a gawking expression.

Princess Celestia blushed, Princess Luna looked seemingly innocent and Cadence just giggled. None of them offered an answer or a reason why he wasn't informed.

Twilight took a very deep breath and stared into the very much stupefied changeling king's eyes. "Sex, we're going to have sex with you," she straight forwardly informed him in a monotone voice.

Thorax nodded, but then it looked as if he was about to be struck by a pegasus chariot in mid-flight as his eyes went as wide as saucer plates. "Oh... haha, I get it... that's.. that's a good joke, Twilight," he laughed with a stressed somewhat forced smile.

Cadence, with a suave smile and sway in her hindquarters, rubbed up against the changeling's side as she went by him. "Oh, she wasn't joking... old tradition, very old," she confirmed the truth. She used her hoof to lift that beautiful, but fragile looking tail and peek under it. As she saw the familiar puffy orifice, of which she was so well acquainted with due in part to several lust driven escapades, she licked her lips.

Thorax froze as he felt her advance, hoof moving his tail and practically feeling her eyes feasting on the sight of his light green wrinkly doughnut of an anus. He couldn't move, too lost as his mind raced to grasp the reality of what was happening.

Soon, the three other princesses had joined Cadence in exploring his body. They felt his balls, nibbled at the more sensitive bits where his exoskeleton was as tender and sensitive as flesh. They all were absolutely fascinated, much to Thorax's embarrassment, when they saw that thick periwinkle colored cock with all it's thick plate like ridges. By the end, Thorax surrendered himself to their motives and found himself leading them to his private bed chambers.

Twilight was the first to act, pushing Thorax to the bed so that the changeling landed on his back. "Changeling physiology is a mystery, but so far I'm quite impressed with my findings. Lets see how your stamina and endurance hold out," she smirked as she climbed on top and stared longingly into those deep opaque eyes.

Utilizing her magic, she guided the tulip shaped head of his cock as she leaned back. Her eyes rolled into the back of her head, the alicorn moaning in bliss as she felt his length stretch and fill her marehood. "Dash showed me this trick, lets hope you like it," using her hind legs and wings, she began to work herself up and down his cock. She'd flap her wings just as she reached the apex of what little lifting she could manage with her hooves, then allowed herself to fall and impale her marehood on the changeling king's cock.

Thorax groaned which each time he felt her fall briefly, her marehood squeezing tightly around his length as it was forced deeply into the hot moist depths of her orifice. His body reacted instinctively to the sensation of pleasure and began to thrust upward into her body as it sank by down and devoured his cock hungrily. "I... I'm going to cum," Thorax muttered, which only seemed to encourage the mare to breed him even faster! He gasped sharply as he felt Twilight's insides convulse as the mare reached her orgasm. He couldn't hold it back any longer as he let out a loud moan, cock throbbing with immense pleasure as he pumped the contents of his loins inside her.

Twilight was riding through the climax of her orgasm when she felt something strange and new. It was if she was being filled with something more.. solid and hard. "Oh gosh... he's... he's filling me with his eggs," gasped Twilight who stuttered as she tried to catch her breath. Her mind and stomach fluttered as she felt her womb being filled with a sensation she had never experienced before! By the end, there was a noticeable bulge as she dismounted herself. "Well... then.. that was fun," she surmised with a grin, rubbing a hoof along her now egg filled marehood. It felt good, like eating a full meal, but sexually fulfilling instead of sating hunger.

The other three princesses looked at each other then the bulge in Twilight that was King Thorax's eggs.

"Okay, that's definitely something I want to feel," Princess Celestia as the first to speak after Twilight Sparkle had her go at Thorax. "Princess Cadence, if you would?," she gave her a sly smile.

Princess Candence curtsied and her horn erupted in an aura as she started casting the spell. Her magic surrounded the exhausted changeling, seeping into his body and reinvigorating him with strength, energy and amplifying his sexual drive. "Don't worry, feels odd the first time, but you get used to it."

As if waking up from a full restful night's sleep, Thorax found himself suddenly willing and able bodied as he rolled over and rested on his stomach. "About those... eggs, Twilight. You can... um... just squeeze them out later. Changeling females have an inherent magic that fertilizes eggs. Don't think it works the same with ponies," Thorax smiled.

Twilight grinned, "Mhm, well I bet they'll feel quite good when they're coming out."

It was then Luna stepped forward, clearly asserting herself as the next princess to bed the changeling king.

Thorax cracked excitedly, "You know... I could get used to this."