Many Years Before the Monster War

"Give it back! Please!" The filly cried out to a couple of bullies as they kept her doll away from her. Yet another bright and sunny day bestowed by her mother, Faust, had gone to waste because of these fools.

"Ohhhh, man! I really LOVE being an idiotic shithead!" One of the bullies laughed.

"Yeah! Forgetting about the fact that her mother and father could smite us out of existence really puts a smile to my face! #Euphoria!" The other one replied.

Yes, they were taunting one of the daughters of Faust herself. Celestia was her name. White skin, angel wings, rainbow mane, and all. She was still young and unprepared for the world, however. In this case, it was being harassed by some jackasses looking for a quick thrill.

"Don't make me tell on mom!" She cried out. It was that moment she realized why her little sister, Luna, was hesitant to go out into the world beyond the castle. These types of ponies roamed.

"You know what you really are?" One of the bullies taunted.

"When you keep this up, all you'll be is Forever Alone!" The other one laughed.

"YOLO! YOLO! YOLO!" They kept singing together as Celestia sighed in sadness.

"GRAW! Hey! Knock it off!" A squeaky voice rang out.

They all looked up and saw...a little puffball with grey raven wings. Two bulbous yellow eyes peeked out of the fur. No mouth was visible.

"I've watched you long enough to get tired of your taunting and your anachronism spreading ways! It's time somepony or someTHING does something about it!" He dive-bombed one of the bullies. "Your dubstepping, SWAG-ing, and Hot Topic buffoonery ends NOW!" And with that, he hit his mark, but the bully didn't even budge.

"One thing you've got to know about dubstep..." The bully said as the creature fruitlessly pushed him. "Always remember to DROP DA BASS!"

And with that horribly referenced meme, the fists came down on the little guy, sending him to the ground.

"C'mon, man. Let's go complain about this on the Twitter." The bully said.

"#EpicFail!" The other replied before the two went off.

Celestia walked over to the poor thing. "Are you alright?"

He coughed a bit, before it quickly rose up. "I'm...fine. But know this. I didn't save you because of your beauty. I saved you because a true gentleman and a future king must care for his subjects and all the others around him. No matter the cost. Now, if you'll excuse me, I need to vomit. Violently."

And with that, he flew away. Celestia noticed a name-tag on the ground. He must have dropped it.

"Monstrum in Cælo." She aloud. "A bit of a sinister name, but he's...such a gentle thing."

"HURRK!" Went the tiny creature in the distance. "SWEET GOJIRA, WHEN DID I EAT BREAD?!"

"...Such a gentle thing." She still said.

The years passed and the both of them became the best of friends, thanks to a combination of kindness, exposition, and montage-ing. Monstrum in Cælo (or simply, C-Mon, as we'll call him now) was indeed a gentle creature. He was just, polite, a bit of a dork, and never one to stray from helping out a soul. Later on, he and Celestia would learn that Luna had met his brother, Monstrum in Inferno. The foursome hung out like there was no tomorrow.

Imagine their shock when, years down the road later, the two monsters realized Celestia and Luna were...closer than they imagined.

"YEEEEEEEEEEES!" They shouted.

Then, they learned they had to go to war because the ponies didn't react well to their kind when they inevitably broke free.

"SHIIIIIIIIIIIIIIIIIIIT!" They shouted during that time.

Indeed, they had to go to war with each-other. They were still puffballs at the time, so their lose was guaranteed. Their leadership, however, was enough to at least make sure the fight lasted long.

Before they were sealed away, it is rumored that the four had one last goodbye before they had to separate. They would never see each-other again for a LOOOOONG time.

And all the while, C-Mon would prepare for the inevitable reunion. He knew this was one of THOSE fanfics. Not only would it be romantic, but also...stimulating.

Present Day

Is this what the Royal Sisters had to be reduced to? Hiding away from the terrifying power of the MacGuffin Muffins?

Indeed. That was the case. For an indefinite amount of time, they had to make a difficult decision. Several of their friends, such as the Mane 6, had to spread out across the land to seek help against the new ruler. Twilight and Rarity were back at home, Fluttershy and Sunset searched for help, Pinkie protected her Rock Farm, and Applejack made sure the family was safe. Rainbow Dash had recently been sent to liberate Cloudsdale.

Contact was sparse in the jungles of Zebranica. Still, it provided an excellent hiding spot for the Princesses. Hiding away like cowards was demeaning, but what pony could blame them? They needed time to research and time in a cell wasn't going to fix anything.

However, today was a day for...relaxation. The constant arrivals of Blueblood's search parties seemed to stop at last. Whatever the case was, it finally provided everyone at the base with the means to cool off.

Celestia, in particular, had quite some ideas in mind.

For tonight, she decided to wear her crown, golden gauntlets, a massive necklace that covered her tits, and a regal pair of panties that included a translucent loincloth. The perfect activity for what she was about to do tonight. Her rainbow hair flowed in the wind as she passed by the guards. Thank goodness they were trained not to stare.

Humming herself a tune, she turned to one of the balconies. There she was. Her sister. The Princess of the Night.

"What is it, sister?" Luna asked.

"Don't you think it's time we had a break?" Celestia said, pursing her lips. "Should any danger come, we shall be prepared, but I propose we enjoy ourselves for one night."

"I understand, but I worry about her." Luna said as the both of them walked to their bedroom. "About Twilight. Where she belongs in this growing world."

"In these dark times, I'd say the Princess of Friendship." Celestia stated as they got there. "But, as an added bonus, the Princess of Fertility sounds nice."

"Why that? Is your mind in the gutter at the moment?" Luna raised an eyebrow. "I mean, the first title sounds nice, but still."

"Well, it's not like we've ever had one of those. And Cadence is married, so she doesn't count." Celestia held a finger up. "I'm sure Twilight can handle it and amass more ponies and what-not to help against our nephew's madness."

"In the meantime, what now?" Luna asked before given a sudden passionate kiss by her sister.

"We make up for lost time." Celestia murmured as she removed her necklace. Luna began to remover her armor as well.

BUMP!

"OW! MY brain-skull!" Cried a raspy, yet young, voice. It was coming from under the floor.

"First of all, brother, it's head! Second of all, why couldn't we just use the door?!" A much more deep voice asked.

"Dramatic entrances are the thing!" The other voice argued. "Especially with the mares we haven't seen in years!"

"Aren't you worried about how they will react to seeing us like this?" The deep voice asked. "We grew up quite drastically."

"Just work with me!" The raspy voice commanded before hitting the roof of the floor's underside again. "OWW! MY TEETH-MOUTH!"

The sisters just sat awkwardly at the sound of what was going on. It was obviously a break-in, but not a very good one. It was almost pitiful.

"So...who do you recommend to lay with Twilight?" Luna asked her sister.

"Well, Sunset always liked her a bit." Celestia began as she massaged her sister's shoulders. "Trixie is also a welcome addition, given the chance. Other than that, it all depends."

"What about her brother?" Luna asked as she cupped Celestia's face. "Last I checked, they had a bit of a...history together."

"And they say I'm the cheeky one." Celestia giggled before kissing her sister once more, despite the noise.

They began to grind their pussies together as well. It felt so wrong, yet so right to them. The breasts against each-other, their entrances moistening their skin, and their tongues locked in a battle of dominance...it was like a gift from heaven itself. Now, if only they remembered to grab some "toys" before they settled here.

"Hold on...I think they're making out." The raspy voice concluded. "I'm going in in three...two..."

BURST!

"ONE!" The monstrous head roared. "OWWW! MY SEEING ORBS!"

"I was about to tell you that was a bad idea!" The deep voice yelled.

"You're too slow on the draw!" The creature bragged. Now he really DID get the attention of the romantic duo. "Howdy! Remember me?"

"...Could you please give us a moment?" Celestia asked. "Try to forget what you saw, as well."

"What?! C'mon! Don't you recognize me?" His head turned to Luna. "You too! Remember when we played Call of Duty even before Call of Duty was even invented?! The paradox we caused landed us in Star Swirl's detention area, for Pete's sake! I don't mean to be rude, but I'm a bit hurt."

"That session was with I-Mon, stranger!" Luna said, covering up her body with the blanket. "How do you know of such a wondrous event?!"

"Perhaps it is because the brothers...have returned." The deep voice called out before the two of them finally broke free. They were now standing in front of them.

The deep voiced one was an intimidating one. He was like a bulky dinosaur, but with soulless yellow eyes and an ugly brown armored kind of look. Hideous raven heads jutted out of the front of his shoulders. His upright body showcased a massive set of wings, as if somebody glued two wings together to make a longer one for each shoulder. His tail was that of an Ankylosaurus and he had two-bladed razor claws jutting above his hands.

The other monster was even more horrifying. He was black, red, and a bit white. His body type was like an insect. A long tail that was connected to a serpentine body that had two pairs of sharp spike-like legs supporting the frame. The serpentine form ended in a massive torso with a skull in the center. Connected to each plate-filled shoulder was a segmented white arm that ended in a glove-like hand that had massive claws. The head was even more distracting. It looked like a lizard with disproportionate long teeth. The 3 pairs of glowing red eyes didn't help.

"I have returned, Celly." The deep voiced one bowed.

"How's it going, Lulu?" The abomination gave a peace signal.

"C-Mon? I-Mon? Is it really you?" Celestia asked.

"Of course. We have evolved into our final forms." C-Mon proudly said. "Our kind has been allowed to rise again and live among the surface dwellers. We intend to live peacefully, even though your land is ruled by a tyrant. Which beg the question..."

"Can't we go after him and rip him apart?!" I-Mon snarled. "My powers will make short work of him."

"Well, he's got the MacGuffin Muffins..." Luna began.

"Say no more." C-Mon held up his hand. "Nevertheless, it is an honor that we can be together again. This time, no restrictions."

"Ooooh, boy! I've seen enough fanfiction to know where this is going!" I-Mon rubbed his hands together. "Not to mention..." He scuttled over to where Luna was and gave a warm look. "I really have missed you."

"So...so did I." Luna said before allowing herself to be held by the creature. "You've grown quite strong."

"Yep. I'd show those bullies a thing or two if time hadn't got to them first." The creature giggled. "So, what will it be? Tentacles or simple?"

"I'd say...tentacles, I'd guess?" Luna replied.

"...Nice..." I-Mon grinned.

"Celestia...you've done some growing yourself." C-Mon cupped one of her breasts. "And not just here. How does it feel to rule over your subjects?"

"It feels...wonderful." She gasped before wrapping herself around him. "What about you?"

"I feel like I've become their father." C-Mon smiled before kissing her. He had no lips, so it was kind of awkward. Nevertheless, he turned her around.

"Allow me to show you MY growth." He growled.

"I do like the dominant types..." Celestia smirked as she felt the cock rub against her entrance. His claws were clenched around her waist.

Luna was also getting prepared for her ordeal, as thin tentacles began to emerge from a slot in I-Mon's crotch. "Are you prepared to be filled, my love?"

"Alright. Be aware, though." Luna nervously said as the tentacles began to lift her up. "I have not have had a stallion inside of me. Ever."

"Never?!" I-Mon looked incredulous. "You're beautiful! And smart! And funny! The stallions must be ungrateful to have you as ruler!"

"At the very least...more for you." Luna giggled.

"True that." I-Mon regained his good attitude before he slowly inserted himself into her.

A Few Moments Later...

"Hey...you hear something?" A rookie asked his superior as the sounds of moaning were heard.

"Just keep staring. It's what we're bred to do." He replied.

"'Kay." The rookie continued.

Inside that castle, a scene was indeed going on. Celestia was getting drilled by not only C-Mon's cock, but he also morphed his tail into another cock. Her mouth suckled on it as he continued to ram into her entrance. Cum was dripping onto the floor and Celestia's breasts leaked milk. It was simply too much for her.

Luna was being filled alright. Her mouth and pussy were being stimulated by every single tentacle that fit into them. Some tentacles were wrapped around her breasts, even. She moaned as the ambrosia-like substance flowed into her.

They were near their limits and they knew it. On instinct, the two sisters were allowed to be closer together. The obstructions on their mouths were removed and they began to make out vigorously with each-other. The tentacles started to grow bigger. C-Mon's dick did the same. All in all, it was the end of their session.

The orgasmic scream they all let out was deafening.

Moments passed and the foursome were laying in bed together, at last.

"I feel so complete." Luna said as she cuddled both Celestia and I-Mon. "Our family is whole again."

I-Mon just snored, but a smile still crept up on his face.

"Indeed, sister. Everything will be even more perfect when Blueblood is finally defeated." Celestia murmured as she kissed C-Mon.

"My beautiful queen." He did the same.

And thus explains where they have been all this time.

But what of another princess I'm sure we're all familiar with?

Author's Note

Theme of Monstrum in Cælo:

Theme of Monstrum in Inferno:

Well, that was a bit more straightforward. A bit convoluted, but straightforward. And yes. They were based off of (respectively) The One (Ultraman) and Razenoid (Bakugan). After this, I'm doing something a bit different. A bit more...disturbing.

Optional Designs for Celestia and Luna (respectively):

The next chapter will probably be a reflective one. Thank you.