Yes!

Despite your misgivings, you raise the bottle to your lips once more, letting the thick viscous fluid within slide unctuously into your mouth. It tastes like fruit syrup although there is a slight bitterness to the aftertaste, in spite of which you find yourself licking your lips for more of the unusual flavour.

You look down shocked as you realise you've almost emptied the vial. Part of you wants to finish it off, and it takes all your will power to put the cork back in the bottle. On doing so you find you can read the strange symbols on the label,

Beware the serpent's gift of knowledge

Turning to your Uncle's book, you flick through and find yourself able to decipher several of the languages within that you couldn't before.

As the warning says, though, all knowledge comes at a price, and the price for this knowledge soon becomes apparent. A cold shudder runs through your body, and you clutch at the desk. Your chest hurts, sweat drips from your brow, your bones ache. It feels like the worst case of flu ever, all crammed into the space of a few minutes.

Eventually the pain passes, and you can breathe more easily once again, but you feel different. Walking to your mirror you find yourself having to brush your hair from your eyes, it having grown a few inches in that short space of time. Your face looks thinner, your features more delicate. Your clothes sit differently on your body. Looking down you realise that two small swells now sit on your chest - you have breasts, albeit small ones. Further down it's apparent that your waist is smaller, but your hips are noticeable wider. Turning to peer over your shoulder you realise you have a very prominent and very feminine ass. With a panic you grab at your crotch, breathing a sigh of relief when you feel the shape of your cock still there, even if it does feel a little smaller than before.

You make a note not to drink any more of that potion until you can find out if there's a way of reversing the side effects!