Bad Science-Control Group

Luna woke up from dream walking, vaguely confused and very worried. All the dreams lately had either been about being bred by Rainbow-which was odd, as she was certain the pegasus was a born female-or having her foals, and both seemed to get the dreamer off just as much.

She checked the time- sunrise. She had time to talk to her sister about this, then. Multiple dreams of a single pony weren't rare, especially when it came to heroes or celebrities or even royalty. But this...the same kind of dream, of one single mare, in a way she shouldn't be biologically capable of. It stank of possible dark magic, mayhap a curse on poor Rainbow Dash somehow?

She got out of bed, foregoing her regalia, heading straight for the breakfast table. As she thought, her sister was already there, the sun going up as Luna lowered the moon. "Sister! I have urgent news, I fear someone is using dark magic on Rainbow Dash,"

Celestia looked up from eating, frowning. "That is bad...how did you come to this conclusion?"

"Many ponies are having dreams of her...but aside from the ponies with her, every dream is the same, and Rainbow Dash is not as she is in the real world."

"Worrying...no wonder Twilight sent me a letter asking to visit."

"Ah, good! We should still be careful, but whomever cast this hopefully won't be suspicious at her seeing us this way."

Celestia wrote a note, sending it to Twilight. "I invited them here at sunset so we both may deal with this problem. Now please, go get some rest." she smiled gently, and Luna trotted off to bed after a quick nuzzle.

Luna awoke to the sun still in the sky, confusing her. She touched it with her magic-it wasn't being held up, it simply hadn't been set. She pushed it down gently- it wasn't happy she wasn't her sister, but it did go down. Luna checked the time- an hour past sundown. Something was very, very wrong.

She galloped out of her room and was halfway down the hall before it hit her- no guards. So then where...? She slowed down, looking around the hallways as she trotted along. Her ears turned and twitched, catching faint noises in the distance. She began to blush as she got closer, realizing the noises were of ponies in the throes of passion...many of them...and judging by the sounds, all kinds of different pairs and even groups.

She slowed down, moving towards the throne room, gasping as she heard her own sister's voice! The villain had already gotten to her! She galloped as fast she could, throwing the door open, revealing...oh. Oh my.

Her sister was indeed there, laying on her stomach, tail flagged out of the way so Rainbow could plow her with a massive she-cock. Her faithful student was on her back in front of Celestia, legs spread, an obvious baby bump adorning her smaller frame. Celestia was, quite frankly, eye deep in her student's snatch, literally face fucking.

Around them ponies fornicated, most notably the other Elements and the Crystal royalty fucking the guards. Even Cadance sported a bump, smaller than the others, but there. She rode a solar guard's cock as her husband fucked that same guard up the ass, making out with his wife as he did so.

Fluttershy and Rarity were double teaming a lunar guard mare, Rarity rubbing her pussy against the guards, Fluttershy on her face and squeaking adorably. Luna couldn't believe it- her own guard! Everywhere she looked, debauchery and pregnancy. She stormed in, horseshoes thunking loudly on the masonry.

"ENOUGH! STOP THY DEBAUCHERY!" she bellowed, causing everyone to look at her, including Rainbow, who's eyes she met, still balls deep in Celestia. This was a mistake, as Rainbow's erotic power had grown- she had overpowered Celestia with her own lusts easily, and Luna would fall to her knees just as she had.

Luna's eyes drooped slightly, taking on the same pink sheen as Rainbow's other victims. Rainbow grinned. "Stop? You don''t want us to stop...you want to join us! Right, Princess? You want to come over here, and join us, you want to celebrate with getting pregnant too, right...?"

Luna began walking over, tail flagging. "Yes...I want to be gravid, I wish to have the milky teats of a beautiful, pregnant mare..." she admitted, spilling her own fetishes.

Rainbow grinned wider, "Awesome. Gimme a moment, gotta fuel up ya sis's foal factory first," she explained, Celestia wrapping her tail around Rainbow's hips and meeting her thrusts with her own rolling hips as they got back into it.

Luna sat next to Celestia's flank, removing her shoes to massage her currently flat teats and rub at her drenching pussy. Twilight came on Celestia's face, the elder princess lapping the girl cum up off her face, whinnying as Rainbow buried her girlcock to the hilt and came, filling her with gallons of cum, bloating out her royal womb and back washing out of her tight cunt.

Rainbow pulled out slowly, enjoying watching the stretch of Celestia's labia around her fat, oversized mare cock. It came free with a pop, still hard as a rock for her final princess pussy plundering. The dildo in her own cunt throbbed hard, excited. The magic it had collected each time it corrupted another mind was becoming staggering- this final conquest, one last alicorn, would give it enough power to become irremovable from Rainbow Dash, cementing both its and her power over Equestria.

Luna had lain her barrel on the floor, her haunches in the air with her tail flagged for the magical futa. Dash grinned, nuzzling Luna's cum trap, hooves doing an excited dance on the floor. She had to pull Luna down a bit to reach properly, but once she did she wasted no time in mounting her. Her thick cock slid into the alicorn's folds, spreading her wide. The cock seemed to be even bigger than before, visible through Luna's stomach. Dash took her time, slowly sliding in and out, relishing taking the final princess as the artifact lodged in her slowly absorbed the last of the magic it needed.

She leaned forward, biting down on the back of the princess' neck, hips moving more firmly as she rutted Luna right in front of her own throne. The artifact in Dash throbbed with each thrust, but instead of absorbing magic it was sending it out into Dash herself. With each thrust, she grew a little more. Her limbs lengthened, as her wings expanded and feathers molted just to be replaced by longer, better feathers in moments. Her thrusts increased, drumming a beat on Luna's ass.

Luna moaned, hips moving back to meet Dash's steadily more desperate and harsh thrusts. Her cunt contracted, muscles quivering around the girlcock. She whined as Dash pulled out, her muzzle now a little longer. She grinned, before slamming her cock into Luna's asshole without warning. Luna screamed, eyes rolling back as the artifact's magic still in her made her love it. Dash thrust, rutting, furiously, desperately, spurred on by the artifacts own need. With a mighty throb from the artifact lodge in her cunt, she moved her cock back to Luna's pussy and stuffed it in deep, just in time to unleash a torrent.

As she bred the last alicorn, the artifact let out its last vestiges of magic, disappearing in a burst of pink magic, absorbed into Dash. Now she stood eye to eye with Celestia, her powerful wings twice any alicorn's wingspan, her titanic cock now permanent.

Luna kept moving back, muscles moving to try to milk every last drop out of the cock taking her. Dash put a hoof on Luna's head, keeping her down as she pulled out, moving it back to her asshole. This time, she pushed in slowly, savoring every inch. She pushed in to the hilt, feeling the curve of Luna's guts as she did. Her cock had grown with her, now the length and width of an earth stallion's leg. Dash's other hoof caressed Luna's cutie mark, as she pulled out just as slowly. In and out, celebrating her victory.

Pink magic wafted from her eyes like mist, as she ordered Twilight over. Lifting her tail, she pushed the book worm between her thighs, and sighed as Twilight began licking her. From cunt to ass, she licked and thrust her tongue in Dash's holes in time with her thrusts into Luna. Dash wrapped her tail around Twilight's head to keep her snout deep in Dash's cunt, lapping at her walls, using her magic to tweak Dash's clit.

Dash began thrusting harder, grunting, one hoof grinding down on Luna's head. "Whaddaya say, Luna? Celestia? Should I be in charge? Should I be the one to rut your pregnant, needy holes?"

"Yes!" Luna screamed almost immediately. "You should! Oh fuck, this is what I am really for! For you to dump your hot cum in, to use me! You should rule!"

Celestia was more composed, but agreed. "Yes, obviously we should have been rutting our little ponies long before this. We've been remiss in our duties- please, Rainbow Dash, take the thrones and show us how to truly rule, with an iron cock."

Dash grinned, chuckling. She was now the Avatar of Lust, and every hole in Equestria belonged to her. Even the princesses agreed. Every hole that existed was hers, and literally no one could ever deny her. Rather, they would all beg her to grace them with her cock- and she could hardly deny them, could she?