Mostly, but with one significant error

"...Vasuupalis!" Mary exclaims the rest of the chant.

But at the same time, the annoying brother has sprung into action. "No!" He yells, throwing what appears to be a fistful of harmless powder towards Mary.

Despite having no magical properties, the cloud of dust that suddenly forms gets in Mary's face, and makes her mispronounce the end of her chant as "Vasuupalishp!"

The spell still manifests, a beam of purple energy blasting the shopkeeper's daughter in the torso, and beginning its cruel work transforming her body.

Belle's clothes all burst into magical flame and almost instantly disappear. Next, her breasts swell to twice their original size, and her waist magically narrows, and her hips widen by a similar amount, resulting in her having a rather **** hourglass figure.

Her squeals of panic are suddenly cut off as her skin turns black, shiny and featureless, except for a hot pink round cavity where her mouth should be, and two similar holes down where her pussy and asshole should be. Her nipples are also a matching bright pink. She has no eyes, nose, ears, or, well, any other bumps or texture on her perfectly smooth jet-black skin.

Her hair turns the same hot pink colour, and all the strands merge into one smooth, solid structure. A pink corset appears around her waist, and matching elbow-length gloves and thigh-high boots manifest themselves around her limbs.

In this medieval fantasy world, there are no words for this kind of material and this kind of object. But if there were, they would say that she has been transformed into a living latex sex doll.

At first, she can be seen to urgently feel at her own face and body, no longer able to see and hear, trying to understand what is happening to her. But as the three others watch, her limbs quickly become more and more sluggish and stiff, until soon she is stuck in place, with her hands out to her sides.

And unfortunately for Mary, the rebellion by Phillipe means that one part of the effect has recoiled onto Mary herself. Her own breasts have just doubled in size, and they weren't small to begin with. They're now positively humungous! Furthermore, her bodice just burst into flames and disappeared, leaving her in not much more than her panties!

"Ah, FUCK!" Mary screams, as her new boobs pulse with sensitive need.

"What have you done?!" Phillipe shrieks, as he witnesses his sister's transformation.

"What have I done?!" Mary snaps back. "Who the fuck cares about her, she was a nobody! What have you done to me! A Mage of Illustris! My breasts! My dignity! How dare you **** me to be seen like this! This hex immediately incinerates any clothing used to attempt to cover up the affected body parts. I'M GOING TO BE TOPLESS FOR MONTHS, MAYBE YEARS!"

"Belle, can you hear me? Can you breathe?!" The shopkeeper is urgently trying to get through to his stiff, rubber daughter, fearful for her life.

"Oh cool it, old man." Mary grunts. "She doesn't need to breathe. She's kind of, like, a doll. Keep her away from sharp objects and naked flames, and no harm will come to her, until she transforms back. And until then... Well, the only sensation she can experience is touch. And the only places she can feel anything are her nipples, and those big, slutty gaping holes."

"You fiend!" The brother snarls.

"Careful now." Mary snarls, her eyes turning green once more. "Trust me when I say that you don't want to make me even more angry."

"Please, Phillipe, don't make things any worse." His father urges him.

"You should listen to your father, Phillipe." Mary says haughtily, throwing her hair back with a quick move of her head. "And your sister is still in there, you know. She'll be back to normal in some number of months, but will she still be sane, if she experiences total black-out nothingness for so long? What you need to be thinking about, rather than getting **** on me, is how you're going to give her enough stimulation to keep her mind from going bye-bye. You could do it yourself, but that would be a step too far, surely? Or, you know... You could probably make a pretty penny renting her out by the hour to the other villagers, haha!"

And then, trying her best to not think about the fact that her milkers are now absolutely gigantic, and on full display, Mary goes about collecting the food and other supplies she wanted from the store, as the two powerless men watch on, dumbstruck.

"Seriously, you should think about it." Mary says casually, as she heads for the door with all her stolen goods. "Because also, every time a man cums inside her, it'll reduce the duration of the hex by around a day."

Smirking, Mary leaves the store, and heads back to her trusty black horse.

As she trots her way out of the village, she does her best to ignore the shocked stares of the commonfolk, as they gaze upon her new plus-sized and fully-exposed rack... But she can't help but turn rather red with embarrassment.

How am I going to be able to avoid showing my face... And tits... Anywhere in public for the next several months?! I need to come to places like this to stock up on supplies every few weeks!

But the smirk never leaves her face. Because she feels like she gave Phillipe sufficient extra payback just then, by telling him and his father a few little lies about the hex.

Belle's sensations are not limited to her erogenous zones - she'll be able to feel anything that touches any part of her new latex body.
The hex does indeed block her other senses, but it also prevents the experience of boredom, so she would never go insane from the isolation and lack of stimulation.
And of course, the duration of the hex is not reduced at all when a man cums inside her. She'll be getting passed around like a piece of (shiny and black) fuckmeat for no reason at all!