There's a Spells R Us story called The Vial, where drinking from the vial when the color is white causes you to become more physically attractive. The main character, after turning into a girl, tries this several times on himself, becoming prettier and curvier every time.
http://www.geocities.com/WestHollywo...s/the-vial.txt
But it's never given to a "real" girl though, which I think is a pity. I would have loved to have him invite some girl over from school and let her taste the white. And then see her get greedy with it.
