Mary took a step backwards as Faye thrust her hips forward in time with her dick's growth. By now it looked to be close to 12" long and 3" thick, and it didn't look like it was stopping anytime soon.
"What are you thinking Faye?"
"I'm thinking Mary that, uh, you need to, uh, learn to let, uh, loose." Faye suggested, moaning and thrusting her hips as though to emphasize her point.
Mary watched as Faye's stomach became more defined and then her legs. Soon all of Faye's muscles were starting to become more defined.
"What else did you drink?!"
"Oooh, you like? Guess I can cancel my gym membership now hahaha." Mary watched Faye's remaining clothes give up the fight and fall away as the amazon's muscles grew. "Oh God I wish you knew how good this feels Mary. I feel like I can just pop right now. And with so much in here I could probably go all day long." Faye caressed the two orbs hanging between her legs.
"Faye, this isn't you."
"Fuck yeah it's me! I finally got a chance to live my ultimate fantasy, something I never thought I could do!"
"To live your life as a busty, futa, amazon?"
"That's just the start girl. I wanna see just what these vials can do, don't you?"
"I.... I don't want to do anything permanent." Mary hugged herself and looked away.
"Why? You could literally be anything. Hell, you could make anyone anything if you wanted. Think of what this stuff can do. Why do you want to pass up on the chance to have anything you ever wanted? I know some of your fantasies, I saw your browser history a few years ago."
At this Mary blushed bright red. "Did you tell anyone?"
Faye leaned in closer. "Not. A. Soul. I have my own desires and I'm going to go after them. You can either sit here and miss out or join me for some real fun." Faye held out her hand.
Mary noted the muscles on her arm had grown considerably in the span they were talking. Something warm brushed up against her thigh as she thought it over. She didn't have to look down to know it was Faye's massive cock. When she looked at it, this python had finally stopped growing around 18" long and 5" around.
"Well?"
"I guess I....