A glance into the mirror...
Queen Chrysalis closed the door to her chambers and stretched, letting out all the stress and strain of a long day of planning an invasion. She held her arms behind her back, stretching her fingers against each other and appreciating the sharp series of cracks that came from her joints.
"See that no one disturbs me tonight!" she shouted.
Through the door, she heard the guard on the other side's response. "Yes, my Queen!"
Good. She never ceased to get a thrill from hearing her minions respond so quickly and dutifully to her orders.
She stripped off her regalia. There was the black crown that sat upon her head, which went onto its hook near the door. Then the metal bracers and thick, black hide boots, tossed aside into the corner. Next, her robe, trimmed in Maulwurf fur, which she simply let drop to the floor behind her. And last, the usual clothing she wore, a sleek, form-fitting black leotard that left nothing to the imagination and kept everyone's mind firmly focused on just how fit and terrifying she was.
With that tossed aside atop the boots and bracers, her carapace was at last free to breathe. She ran her fingers along the holes in her arms, checking for any nicks or other undesirable imperfections, as she walked over to the floor-length mirror that stood near her grand royal bed.
She admired herself in the mirror. Her form was impeccable as always. Hard black carapace, plated over the joints, with holes running in between the bones of her forearms and legs. Her wings were translucent, thin but strong. Her hair was long and lank, a gleaming turquoise color that accented the gradient from black to green as one's eyes traveled to her nether regions.
And yes, she checked out her butt. Thankfully, no matter how much she worried about it, it was fabulous as always.
With a sigh, she conjured up the green flame to encircle her form, changing it inside and out. If she was going to waste time looking at herself in the mirror, after all, she may as well take one last moment to make sure her disguise was flawless. She'd need it for tomorrow, after all.
When the flames had died away, what was left was the form of Princess Mi Amore Cadenza. Her work, as always, was flawless. Cadance was shorter than Chrysalis, a bit more plush in the mid section, and with much larger... What did ponies call them?
Boobs?
In her natural form, Chrysalis had two small lumps beneath the chitin covering her chest, but they were reservoirs of fat meant to nourish a queen during hard time. Whatever it was ponies used them for, changelings didn't need.
But in this form, there were two large, solid, jiggling mounds of flesh hanging off her clavicle, with thick, puffy pink nubs on the outermost edge. She ran her hands over them, feeling the firm yet pliant flesh beneath her fingers. She squeezed them, and they regained their shape after just a moment. Her fingers traced the contours of those fleshy nubs, and she noted her new body reacting to the touch, as they grew erect and hard.
"Oh my..." she whispered. Something stirred in her loins.
That was another thing she had never quite gotten used to: pony genitals. Cadance's vulva was similar in appearance to her own, but it lacked the flared spikes of chitin necessary for depriving a drone of its ability to copulate, post-coitus. Couldn't have them running around sticking their parts into any old thing, after all. They became much more pliable afterward.
Speaking of pliant, she lifted one leg to get a better view in the mirror, using one hand to spread apart the fleshy lips. It was a very pliant tunnel, just warm pink as far as she could see, and just touching it like this was sending shock waves of pleasure up her spine. There was also a small nub down here as well, and the lightest brush of a thumb across it made her knees buckle.
Gasping, she crawled to her bed and flung herself back upon it. Her right hand stayed clutching at her breast, while the left began work on that nub, rolling and flicking it until her mind was nothing but ecstasy.
She had to hand it to ponies: they knew how to make themselves feel really good.
"My Queen!" came a voice from the other side of the door. "Is all well in there?"
"Shut up!" she hissed in her own voice. She must have been too loud, all those touches had rather been making her lose control of herself. "I don't want to hear from you again all night!"
She took the silence as assent and stood once again on shaky legs. The guard had broken the rhythm of her self-ministrations and cleared her head, so once again, she was all business.
Well, almost all business. Her left hand and the insides of her thighs were coated in something clear and sticky, while her face – Cadance's face – was flushed a rosy red.
She sneered at the princess in the mirror. The pleasurable feelings had all died away by this point, and she found herself being more overcome with contempt. "Stupid bitch," she said to herself, in more ways than one, "you'll never see me coming."
Something childish within her made her call up her magic once again, and afterward, the Cadance in the mirror sported a lengthy handlebar mustache. She couldn't help but smile, and broke into a wicked snickering. Another flash of flame, and the mustache disappeared; instead, now her face was crooked, with wild buck teeth splaying out from a mismatched, distended jaw, tongue lolling out the side.
"Durrr," she lisped, "I'm Printheth Cadanth! Hurp durp blurrr!"
She spun around in a circle and had to change back to the regular Cadance form so she could laugh. This was a very serious operation she had planned for tomorrow. It was the culmination of nearly a year of infiltration work. But that didn't mean she wasn't going to enjoy it.
She took a deep breath to calm herself, and once more regarded the form of Cadance. She noticed one of her hands had strayed to one of those large breasts yet again.
Yes, she was familiar with the concept ponies called "horny". Changelings didn't experience it; drones just mated with the queen when it was time, and that was all they needed. But she'd spent enough time as a young princess, before she had eaten her sisters and claimed the hive, infiltrating pony society and feeding off love to hone her skills. She knew about the concept of sex, and how it felt good in a pony body, even if she still didn't completely understand everything about it.
And it seemed like right now, her body was horny, and she was going to have to do something about that.
She could, of course, always return to her natural form and just go to sleep. That would solve the problem. But where would be the fun in that? Time to experiment.
First things first, these breasts. A flash of green fire, and they had increased in size. She felt the skin pull tighter as they hung lower against her stomach, and the larger nubs became that much more sensitize. Another flash, and they had doubled their original size. She ran her hands over them, reveling in the sensation of having a part of herself that big and full. Though now she was feeling a bit of strain on her back. Maybe this was too much.
Okay, back to the slightly larger version. A nice, ripe size that lent itself to squeezing and fondling. Could she do more?
Flash! Now there was a second pair of breasts beneath the first, about two-thirds their size. She could run her fingers from one set of nipples down to the second set, and it sent shivers throughout her body.
More, she needed more! Flash! Flash! Flash!
When the fire had cleared, she had a full five sets of mammaries, receding in size from top to bottom. She ran her hands along the front of herself and groaned in pleasure. What wonders these pony bodies could possess!
She stayed like that for a few minutes, just fondling her new tits and enjoying every second of it. But after a while, she wondered what else she could do. There was no more room for breasts, the fifth set was attached at the top of her pelvis and things had gotten crowded.
Maybe more of something else? A flash of fire, and there was another Cadance head perched atop her shoulders, squeezed up against her first head.
They looked at each other, or tried their best to, then looked into the mirror.
"Nah," they said in unison, and with a flash, she was back to having a reasonable number of heads.
No, she needed something to put in between all those breasts. That would do the job! She thought back to the last time she imitated a stallion for the sake of sucking love from his marefriend, and...
Poof!
Now a flaccid male sheath and a pendulous sack hung from between her legs, just inches below that last set of breasts. The balls hung down almost to her knees, and the sheath ended a hand span or so above that. It was quite impressive.
She had maybe overdone it a bit, but she had a plan. Of course, that plan kind of went out the window when she saw herself in the mirror. Cadance's face – her face – was flushed red. And the more she gazed at the erect nipples, the rows of firm breasts, and that long sheath, the more she felt...
Oh dear. Her sheath was twitching. Yup, here came a stallionhood out from it, glistening and growing into a firm ramrod the length of her torso. It had a mind of its own, and clearly that mind liked what it saw.
She flopped backward onto the bed, watching as her cock grew to its full length. It bobbed above her like a tree in a storm, just waiting for her to touch it.
So touch it she did. The feeling was electrifying, the large organ so smooth and sensitive. She couldn't quite reach the flared end, not with it standing erect above her like this, but running her hands up and down the shaft was everything she needed to make herself feel giddy with elation.
Of course, it was also kind of difficult, reaching both arms all the way down past all those breasts. She wanted that cock closer. Or maybe...
A flash of fire – and thank goodness her sheets were immune to changeling magic – and she had another pair of arms below the first two. Another flash, and two more arms. Now she could reach the cock! Her lowest arms stroked the shaft up and down, while the other four arms squeezed and squished her breasts all up and down her torso.
One of her lowest arms even snaked its way into Cadance's pussy, giving her twice the electric current running along her nerves. It only took a minute, and suddenly she was orgasming from both ends, her cock fountaining a spray of white into the air that came down to cover her and her bed.
She moaned in ecstasy. This was what she needed! But she wasn't done, not yet!
Keeping one hand in her cunt, she used the other five to slowly, gently guide her cock down between her intense cleavage. Having outed its load once, it was far more pliable than it had been. Once it had nestled in between all five sets of breasts, she could just lick the tip, and she did so, savoring the taste of the juice that her magic had created for her to enjoy.
She used her uppermost hands to hold the cockhead in place while the others (that weren't buried between her legs, anyway) grasped her breasts and slid them up and down the length of her shaft. She did this, feeling the silky curve of the breast against every inch of her, until her body gave one last earth-shattering shudder and she came again.
This time, she coated her entire face – Cadance's face – with milky white semen, while her vagina loosed a torrent of clear, sticky femme cum out the other end of the bed. She licked her face clean, then lay back, panting, heaving, letting her cock go and watching its vibrations ripple along the surface of her many lovely tits as it oscillated in the air.
Then, slowly, it sank back into its sheath, bringing her one-woman orgy to a close. But what an orgy it had been!
"Ponies... really know how to have fun," she gasped.
Once the orgasm had worn off and she felt more in control of her faculties, she stood and reverted to her natural form before she could get another look at herself in the mirror. She had a small regret leaving the strange faux Cadance form behind somewhat. She wasn't going to be able to do that kind of thing in Canterlot, after all, and she wasn't sure any other dalliance with the princess's groom-to-be would match the sensations she had just experienced.
She reached out to the hivemind, searching the caste of workers tasked with hive maintenance.
I need someone to come clean my bedchambers at once! Bring a mop!
She didn't even wait for a response; she didn't have to. Reclaiming her robe, she wrapped it around herself and sat down in a plush armchair to take one last look over tomorrow's invasion plans while she waited for the cleaner to arrive.
It was good to be queen.
Author's Note
Thanks for reading! 
Sorry I haven't been around, this isn't really what I do all the time. But I had another 'dream', really more like an image I couldn't get out of my head, so I had to write it!
