Rarity twisted his form in her magic, pulling him up so that he stood on his hind legs, giving her perfect reach to start stitching down his free limb, the stallion straining against her magic as she went, her spell now firmly set in as the aura faded from sight while still holding him fast. His wings stretched out behind him as his stallionhood was forced onto display, twitching stiffly in the cool air as Rarity held him up. She quirked a brow, pausing for a moment to examine him before she reached the end of his second forelimb.

“My my… Didn’t expect for you to get that into it so fast. Normally it’s not so quick… unless you were expecting something before you even got here? Hmm?” She giggled. “Or maybe it’s just something you like, and never admitted to. Is that is?” The mare teased.

“I a-ah… ah... “ Mile gulped, flustered and confused, feeling so violated and on display, but he couldn’t quite bring himself to deny it.

“I understand, I understand darling. Really, say no more.” Rarity replied.

It wasn’t long before both Mile’s forelimbs were affixed out in front of him, the ossifying grip of the fabric now spreading over his torso as she worked along him in steady lines of stitching. It felt tight almost, like a sweater two sizes too small being stretched over him, with a tingling prickly warmth everywhere that had changed fading to dullness. His neck popped and crackled as it was reared back, setting into a curve with her dutiful sewing, then her attention shifted down over his belly, pulling the forming fabric along over his body. He felt confined in his fabric form, his breath squeezed and held in a rigid shell, barely able to draw in enough to speak.

“R-rh… Rarity… p-please… I a-ah…” He gasped.

“I just said, say no more.” Rarity looked up from her work with dead seriousness. “Though you’re about at that point it seems.”

Mile shuddered as he drew in one more breath, stopped short as the magic worked from the outside in, a pressing fullness taking over his belly and chest, filling with a fuzzy rigid warmth as his biology turned to fill, robbing him of any ability to speak. Rarity nodded with satisfaction, her horn aglow for a second as she grabbed hold of his wings, both rigidly stretched out before a startling, disconcerting POP caught his ears as she wrenched each one away from his body, separating them entirely!
The stallion bucked and squirmed, looking on in silent flustered fear as she robbed him of his wings, which appeared to have pulled off with a forming metal bracket at their joint, as if they could be reattached later. She tossed them to the floor with a clatter before stitching enough that she was able to do the exact same with his tail, that appendage twitching before she pulled it away from his form, dropping to the floor into a pile beneath him.

Humming to herself once more, Rarity scanned her eyes around the room twice until she found what she was looking for; it was an empty mannequin stand off in the corner. With that stand in her magical grip she stretched the half rigid pony upward and rammed the metal pole right into his belly, the blow hitting with a WHUMP that would have maimed any normal pony. Her magic suddenly dissipated around him, the mare having decided there was no more need to forcibly hold him still.

Mile’s weight leaned forward onto the pole, its… no, his base canted at an angle, leaving propped up on his hind legs, awkwardly twisting too and fro. He shivered deeply, his cock twitching with need that he knew he couldn’t reach, his cheeks deep red as he mouthed breathlessly at his femenine captor. She had left him there for several tantalizing moments as he grappled with his vanishing control over his own body, the mare off looking through her desk for a pair of glasses. His mind roiled trying to comprehend what was happening to him.