(All characters in this story are at least 18 years old)

Hermione, Ginny and Luna where in the school's potion lab, the room was for students to make potions for extra credit, Hermione and her two friends where working on a new potion, this potion was going to be for woman who want to look younger as well as sexy'er then what they are now.

"Are you sure this is the right color" asked Ginny who was stirring the potion, the potion was a light red.

"yes, now stir it clockwise two more times, and i will add a dragon's tooth, while Luna add's the Troll semen" said Hermione looking at her notes while getting ready to add the next ingredient.

As Ginny finished stirring the potion, Luna and Hermione added there last ingredient, the potion turned a light yellow color as Hermione finished the stirring the potion, and set it to simmer for a few min.

"so who want's to test the potion out, once it is done" asked Luna looking at the potion, then up to her friends.

"well i dont want to, i am sexy already" said Ginny with a smirk and slapping her own ass.

"why dont you do it Hermione, God know's you could use it" said Luna and Ginny together pinching Hermione's ass.

"hay, i am sexy...but it is my potion, so i will take the first drink, to see if the potion works" said Hermione to her two friends.

Once the potion was cooled, Hermione spooned some into a cup, and with out thinking about it, drank it.

"hmmm...tastes like hot butter...need to work on the taste" said Hermione.

Hermione did not feel anything, thinking the potion was a fail, when Ginny shouted.

"Hermione...your breasts....they...they....are getting bigger..." said Ginny pointing to Hermione' chest.

Hermione looked down at her chest, it was true, her Breasts where now pushing against her shirt, they stopped getting bigger when she now had D cup breasts.

"Um...Hermione...i think that...could be a side effect" said Luna looking shocked at Hermione.

"well, Breast expansion could be normal, it is sexy" said Hermione.

That's when Hermione and Ginny heard ripping noise.

RRRRRRIIIIIIIPPPPPPPP

"what the...." said Hermione and Ginny together, Looking down, they found a big cock had ripped out of Hermione's pants, it was throbbing.

"Hermione...you grew a cock....wow" said Ginny.

"Luna, can you look into my notes and see if i wrote down how to reverse this" said Hermione.

while Luna was flipping thru books, Hermione looked over at Ginny...wondering what would it feel with her new cock going in and out of her pussy....in and out....her testicles throbbed, full of cum....need to....cum...need...pussy