A girl finds a Monkeypaw and makes a wish only her pussy can get fatter. She wanted to have a big fat pussy like her idol XoMarym, she could get the rest of the look through implants. The monkeypaw's twist being that her pussy is literally the only thing getting fatter. Nothing or no one else is able to gain any weight. All of the fat accumulating after the wish goes straight to her pussy. Within half an hour she surpassed her idol's size tenfold, along with her sensitivity going through the roof. She is excited for what will happen once the rest of the world starts noticing that they can eat whatever they want without gaining a single pound. She wonders what else she should wish for with the paw to enhance the process and how the wish will get "messed up"
It was difficult to think properly after only an hour as the pleasure was really driving her crazy - her pussy was almost dragging on the floor right now, her clit almost throbbing in anticipation, needing to be rubbed harder and harder due to how horny she had become, not to mention her floor needing a 'slippery when wet' sign due to how much pussyjuice was flooding the marble.
A big fat pussy just wouldn't cut it now, though in a way, this is really what she wanted...maybe she just didn't believe it was possible? Either way, her body changing like this, adapting so that she could get the largest pussy ever, by a long margin, bigger than any idol could possibly try to achieve...this monkey paw wish didn't look bad at all.
Once she orgasmed a few dozen more times and regained her bearings somewhat she'd probably want to make a wish. She might have to wish for something like plastic surgeons being transported to her ready for a procedure to give her implants, as it'd be very hard moving herself to any kind of clinic or hospital with her current size, not just from what it'd look like in public, but how troublesome it was to literally just do the moving part itself.
Though if she ends up wishing that, she may regret the fact that every surgeon would appear in the general radius, teleported there and mind warped to believe they were always going to do this, they'd also bring every implant in the world along with them, since she never specified how big she wanted her tits and ass to get...
All while her pussy would keep swelling from the procedure itself. I feel like people noticing they wouldn't gain weight wouldn't happen very quickly compared to her sudden, continuous growth that she was already going through. After all, with how enormous she was bound to get in just a week or so, I can't imagine people would plan to overeat unless she managed to get off the planet before it was engulfed by her pussy's ginormous lips.
Perhaps she'd have to invest on a third monkey paw wish, something to really keep her size toned down... which would likely slow her growth rate by 0.001% making no difference as her size skyrocketed every single day just from other people eating too much food...or maybe not enough~ <3