Robert's eyes were on Jess's impressive chest as he adjusted the controls and aimed the gun awkwardly with his now oversized hands. He looked straight into Jess's chest lustily as he aimed the weapon, and his thoughts turned to how she'd look after he'd fired.

He spent a few seconds imagining before pulling the trigger, only to see Jess tumble to the ground, her ankles swiftly pulled away by Amanda as she rose into the beam of energy.

For a second, there was momentary silence as Roberts brain began to switch gears as he processed what had just happened... and what was about to happen.

His sister cried out as she transformed, her body seeming to momentarily shrink as her body tightened into sinuous muscle and then explode outward.

She barely had time to feel the growing definition in her arms and abs before they began to expand outward, filling the petite clothes she wore, and then tearing them at the sleeves as her biceps and shoulders tore out the arms. Robert observed, facinated, as the biceps swelled to monsterous proportion.

Jess watched in envy as Amanda's figure burst into impossible bloom a few moments later as her chest filled out just as she turned from the floor towards Amanda with anger and envy. She heard the bra snap as her chest expanded, and then a few moments later watched as the blouse Amanda wore filled and stretched, top button snapping immediately as her chest filled to brobdignagian proportion, straining the fabric and leaving two points firmly indented against Amanda's normally loose fitting blouse, cleavage visible between the highly strained buttons.

Amanda's hips and thighs were next. For nearly half a second she felt a slight pain as the jeans she'd been wearing pressed against her expanding body, then they shredded against impossibly thick muscle, calves bulging out of the tearing fabric. A few moments later followed by a tearing behind her as her ass began bulging with muscle as well, throughly, till the tears left her jeans a tattered set of rags, covering only the barest part of her absurdly muscular legs and hips.

She began to grow taller at this stage, abdominals becoming visible as the shirt seemed to transform into a haltertop for a few seconds. Both Robert and Jess stared in dumbfounded amazement at the insanely muscular waist- each muscle not only clearly visible and defined, but thick and powerful as well.

Then they gazed upwards again as Amanda's expanding shoulders and chest tore the blouse to pieces, revealing two mammoth globes of flesh proudly bouncing forth, backed with powerful pectoral muscles. Her optimum definition reached, Amanda simply expanded at this point, up and outward in perfect proportion as she grew... and grew.. and grew, only stopping till, like her brother, she crowded the ceiling.

She looked down at Jess's tiny doll-like frame now and smirked with a combonation of pity and revenge.

"THAT"S IT! YOU ARE SO DEAD SIS!".. he began adjusting the settings on the gun, trying to rapidly turn the dial with his huge hands, but Amanda dove forward and slapped the gun from his hands with more force then any human had ever done in history. Ignoring the gun, Robert quickly shoved Jess back, sending her careening into a bookcase that shattered, and leaving a crack in the wall and floor behind it that ran to the ceiling.

"YOU CAN'T BE THE STRONG ONE, I'M STILL BIGGER THEN YOU !" Robert shouted as he balled his fists and went into a fighting stance.

It took Amanda a moment to realize she hadn't even felt pain from smashing through the bookcase or cracking against the concrete - only a slight tinge in her head from the impact. She sized him up quickly. He was right.. Robert still had an inch or two and a fair amount of muscle, but this was the best chance she was going to have - plus she'd always been much stronger then him when they'd fought - she figured she had a good chance in a fair fight.

She rose to her feet and smirked. "Robert.. it's time you realized you're a baby in a grown up, over-muscled body. I'm SOO going to enjoy kicking your ass." She said, wagging her finger at him.

Then he lept at her from across the room...