Meredith walked over and...
Was caught by surprise as one of the bimbos planted a kiss right on her lips, letting tiny bits of the potion enter her mouth. Meredith pushed herself away as soon as she could, but it was too late, she had already ingested the equivalent of 3 drops of potion.
"Oh no" she thought as she felt her body start to change. "I have to fight this, I can't let myself become like them, maybe I can hold the transformation off until I find a cure."
Suddenly Meredith's body started to feel warm, her already decent breasts perked up and gained a cup size, now at about a D cup. Her ass filled in slightly to give it a nice heart shape, and her thighs grew bigger to match. Her jet black hair grew ever so slightly lighter, though it still looks black, if you were to shine a light on it you would see it was actually very dark brown now. As the physical changes begin to finish Meredith looks down at her hands to see that her nails have gotten ever so slightly longer and her skin has gotten a bit more tan, looking more healthy than the ghostly white it was before.
Finally the mental changes come, Meredith knew this would happen and tries to focus her mind, only to find that she can't tell that anything has changed, and in all reality, not much has changed, all that happened was her IQ went from a whopping 150, down to 145.
"Ok, maybe I do have this under control, I look more or less the same and as far as I can tell, my mind is still the same."
The moans of the two bimbos on the floor next to her draws her attention away for a few moments. "Huh, they do look really cute at least."
At this thought Meredith's mind becomes clouded before clearing up again, dropping her IQ again this time to 140. Knowing exactly what has happened Meredith walks out of the room and focuses again. "No bimbo thoughts, got it, guess I'm not out of the woods yet..."