Sarah took the gun from Jen and ran her strong hand along the barrel. "So...this is Amanda's little secret huh?" Sarah smiled to herself. Jen squealed with excitment, happy to see that Sarah was pleased with her success.

"Yeah Sarah, can you believe it? That fool Amanda made me huge like this before I knocked her out and came here! I can see why you like being so big!" she giggled, flexing her biceps and kissing the massive peaks which rose to greet her. "I know you're eager to try out the gun Sarah but...you think we could go downstairs to your home gym so I can...test MY strength?"

Jen purred, sauntering over to Sarah and running her hands down Sarah's massive back before reaching her sculpted ass and giving it a loving squeeze. Sarah jumped a little in surprise. Turning to Jen she smiled knowingly, "Sure Jen, we'll test the gun later, lets go see how much you can handle." Placing the gun under the pillow on her bed, the two huge women walked out of the room.

As soon as she heard the basement door close behind them, Tiffany, Sarah's younger sister crept out of Sarah's closet where she had been hiding. She made a habit of spying on her older sister, whom she envied greatly. Ever since her transformation into a muscular amazon, Tiffany had watched Sarah dominate and control everyone around her. Tiffany wanted what she had. She wanted to be the one with all the power.

Removing the gun from its hiding spot, Tiffany examined it. Dials on the side seemed to control muscle and height. Tiffany's eyes grew wide and she smiled evilly; here was her chance to get the power she deserved. Still, she had to be careful, who knows what this gun was capable of. She decided to give herself a little test dose to see what would happen.

Tuning the dials she aimed the gun at her arm and pulled the trigger. She gasped as her small arm, and her entire body along with it, swelled up with muscle. Every fiber of her body expanded, her bones lengthened as energy washed over her. Taking her finger off the trigger she looked at herself in Sarah's full length mirror.

Her shirt was now little more than a strip of cloth hiding her C cup breasts. Beneath her perky tits was a hard six pack of cobble stone abs. Her shorts had been stretched thin and did little to hide her now impressive legs. Flexing her bicep she smiled as a tennis ball sized bulge swelled up.

"The power...it feels incredible" taking up the gun once more she looked at it intently and prepared to make her next move...