"Hey mom?" Called Jen, ready to give her mother a pill-laced smoothie.
"Yes dear?" Her mother answered from down the hall, before walking towards the kitchen.
"I made you a vitamin smoothie, with something a little... extra..." Jen handle the smoothie to her mother, an older woman with almost no curves, flat chested with boxy hips.
As per usual, her mother thanked her and proceeded to chug he smoothie in a single go, before setting the glass down and wiping her lips with her hand.
But this time something really, REALLY, changed.
At first, the change was small, as her lips grew red and plumped a bit, before suddenly doubling in size, then tripling and becoming bright red and quadrupling and forming into a permanent pout.
Then they grew more dramatic and big, literally, with her breasts ballooning to a one meter diameter each and tearing her shirt and bra apart, revealing nipples the size of soda cans, spewing milk with areolas each a foot across.
She made a face of extreme pleasure as the front of her pants began to push out further and further, a large wet patch forming on her crotch, before the button on the front of her pants exploded outward showing a rapidly growing vagina with a clitoris the side of a softball and a never ending flow of juices that spilled out onto the floor in a massive puddle as she dropped to the ground, barely managing to sputter out "thanks for *unh* the little *ooh* extra*mph* Jen..." before breaking down in extacsy.
Jen, no longer stuck in a trance, watching her mother rapidly turn into an exaggerated bimbo, took her stuff and bolted out the door, fearing what was to come...