Hey Cressy, I learned a new trick in alchemy class, and I think... I can use it for my, umm, _sexy potions... You wanna come over tonight and test them out~?

I.. I dunno if we can keep doing this, Kura... Look at how big my legs and butt are now! And you with your boobies too! If we keep this up, we are going to be shaping up to look as big as Nurie! I'm sure the others are gonna get suspicious about what we're doing after school to make us... grow so much...I know we're gonna get in trouble!

That's the thing, Cressy! I think I found out a way to make them temporary! Although I still need to get some kinks sorted out in the method, I think I might have found a way for us to have fun with them and not worry about permanent effects~!_probably...

What-edly?

N-nothing! So are you in? C'monn, remember how good it felt 3 nights ago...~ Dont'cha wanna help me make you feel like that all the time with no consequences~?

Iiiiii uh, uhm... It... It did feel really good when you- *ahem* _{massaged my butt while it was growing...~}. A-are you sure we won't just get even bigger permanently?

I'm pretty sure...~ So tonight~?

Oh-okay...

Great~ If you can, bring your stretchy gym shorts, okay?

Oh~! Uhm, s-sure thing~

__________

Talking with  vanttalon about the Fennekin version of his Delphox gal Nuria, and he suggested I should try the same thing with my Phoxes Crescera and Fukura, so I did! Although I wanted to try Braixen forms first :3
They both weren't so curvy before, but that changed after befriending Nuria, with her growing assets problem.
Fukura used to prank the other students with silly potions she made in her own time outside of alchemy class. But after becoming obsessed with Nuria's shape, and wanting to know how it felt to have such a body, she slowly began tailoring her alchemy to the more lewd side of effects.
This eventually led her down the path she is now with her proficiency in body-altering potions.

Crescera, being one of the first pranked by the new lewd batch of potions by Fukura, could not deny the feelings that it gave her, and decided to hang out and befriend Fukura over the event.
She slowly became Fukura's willing test subject throughout the years, and it slowly showed on their bodies, never fully returning to their original size after a couple nights of experimentation.
She sometimes worried about ending up as big as Nuria (or bigger), and the implications that would have on her daily life. But sometimes the thought excited her, and she couldn't for the life of her figure out why. Either way, the worries were washed away by other thoughts every potion testing night, and eventually became non-existent over time.
Binding the Alchemist with her test subject, they later moved in once all was said and done, and continue with their lewd and fun shenanigans today~

Oh, and by the way, she actually didn't know how to remove the permanence yet, and thus Crescera ended up thicker still~