Voodoo-plushophilia, between r63 Celestia and Chrysalis (not sure how you might name them) Wherein The king changeling gets his hooves on a plush version of the prince, and anything he does to it is felt by the original. Might include size play, dirty talk,

King Chitin eyed the doll in his hooves with no small amount of glee. It’d taken him far too long to acquire this toy. He was looking forward to seeing whether it would work the way he’d been promised.

A flicker of his horn set the surface of his mirror rippling; a twitch of his neck made the glass resolve into the familiar image of Canterlot Castle. Another flicker, and the picture showed the inside of an even more familiar bedchamber. Chitin’s lips curled into a smile as he saw his soon-to-be victim enter the image.

Prince Solaris. An excellent specimen of masculinity—for a pony, at least. Tall; broad-shouldered; high-browed; and with a beard so luxurious that Chitin had long suspected the prince used magic to maintain it. His wingspan was the widest in the kingdom, his horn the longest and sharpest. Chitin licked his lips eagerly. Not to mention his other horn…

A third flicker of magic set a virulent green aura rippling around the doll. The same aura appeared around the stallion in the mirror, though of course, he couldn’t see it. The entire show would have been rather ruined otherwise. Chitin hefted the doll in his hooves and, slowly, savoring the moment, dragged his tongue along its firm rump.

He watched out of the corner of his eye was the alicorn in the mirror stiffened, his ethereal mane freezing in place. Chitin licked again, then nipped at the plush’s haunches, wormed his tongue between its cheeks. His grin spread even wider as he saw the prince shiver, watched his pupils dilate, his muzzle open slightly—

And then the Solar Prince was back in control. “Who’s there?” he said. Chitin nearly rolled his eyes. That voice. So demanding. So passé. With a tap of his hooves on the floor, a piece of string sprang off of a nearby table and eagerly wound itself around the doll’s hooves.

Chitin watched with glee as Solaris gaped, stumbled, fell. His legs had snapped together, leaving him powerless to escape.

“Who is this?” the prince thundered. His horn rippled with gold, blazing, for an instant, with an aura of white-hot fury before quickly cooling back down. “Release me!”

“Oh,” Chitin said to himself, chuckling. “I’ll release you all right. But first…” He carefully levitated the plush up to a miniature mattress he’d assembled out of a bit of cloth and some twigs. “We wouldn’t want you to be uncomfortable, hm?”

The Solaris in the mirror struggled as he was levitated from the floor to his bed, evidently by the same unseen assailant that had already rendered him powerless. “Damn you,” he grunted. “Damn y-ooooh.”

Chitin’s lips curled upward as he busied himself with lapping at the plush’s exposed crotch. There wasn’t any “equipment” there, but he could easily imagine the prince’s member being taken up by an invisible, gargantuan mouth. He could imagine the prince grunting and groaning, struggling to free himself even as waves of pleasure rolled through his crotch.

Chitin waggled his tongue a bit, imagining it curling around a much smaller member. He was rewarded for his efforts when he heard the prince groan for real. One glance at the mirror showed him his prize: Prince Solaris’ massive, throbbing erection. It stuck out of his legs like a fifth limb, its thick, veiny head pulsing evenly as Chitin worked it by proxy.

Never in person could he have imagined taking the entire thing—but here, with the aid of a certain kind of thaumaturgy…

He let up on the blowjob for a moment, grinned as the tension just melted away from Solaris’ body. “Enjoying the break?” he murmured at the prince’s rippling image. “Perhaps you think I’ve gone. Or that I’ve freed you.”

His own erection, a more-than-healthy thirteen inches long, was already prodding at the doll’s rump. To a normal-sized pony, his would already be an impressive length. But to a pony the relative size of a doll…

Chitin grinned as Solaris’ eyes widened, grunted as his well-lubed tool slipped between the asscheeks of his little toy. “Well, my prince,” he purred. “I certainly hope you enjoy feeling full.”