"Hey, why don't you pick on someone your own size?" Mega Mandy roared as she stepped out of the chamber.
At the sound of Mandy's voice, Gretchen turned her attention away from her hapless victims. She sized up the new arrival with sneering disinterest.
"Neat costume," she jeered, advancing on Mandy. "Did your mommy make it for you?"
Mandy planted her feet and took a classic hands-on-hips superhero pose.
"You don't scare me!" she said, her deeper, sexier voice brimming with confidence.
Gretchen smirked.
"I'm about to."
With that, the blonde bombshell sunk her fingers into the floor and ripped up a huge chunk of concrete. It crumbled in her titanic grasp as she hefted it over a shoulder. Gretchen's deltoids flared impressively as she swiveled her arm back, readying for a pitch. Like a catapult, Gretchen's arm snapped forward and hurled the concrete straight at Mandy's face. Mega Mandy reacted with newfound speed and thrust a fist toward the incoming boulder. Her superheroic strength instantly pounded the half-ton block into pebbles and dust. Mega Mandy smiled and resumed her hero-pose.
"You'll have to do better than that to stop--"
Before Mandy could finish her sentence, Gretchen surged forward and into a diving leap. The tension in her leg muscles cracked the ground as she sprang into the air, hurtling toward Mandy. Mandy raised her arms to protect herself, but the force of Gretchen's body-slam was too much for her to handle; both girls soon tumbled from their feet as the fight went to ground.
The grappling muscle girls rolled over one another, rose and fell in a twisting dance of pins and choke-holds. First one, then the other seized the advantage, only to be tossed aside and once again made the victim. Gretchen pummeled Mandy with everything she had, clinching the smaller girl between her massive quads to hold her in place for face shots. Punches that missed slammed with the force of gunshots into the floor, leaving huge dents and shockwaves that trembled the rapt bystanders.
In a rare moment of freedom, Mandy broke from the close-quarters brawl and barreled through the mall corridor, looking for anything she could use as a weapon. With Gretchen on her heels, she grabbed a heavy metal lamp from a display and cradled it like a baseball player ready to bunt. When Gretchen tried another tackle, Mandy wrapped her opponent up, arms first, in the metal, curling it with her phenomenal muscle power into a rough knot.
Gretchen squirmed in a vain attempt to escape. "Come on!" she growled between gasps for air. "Lemme go!"
"Not until you've learned the error of your ways," was Mandy's reply.
After further struggle Gretchen fell suddenly silent. Mandy looked down at the twisted bar and saw that Gretchen was taking a deep breath in, preparing for a giant chest flex.
"No!" Mega Mandy cried, but she couldn't stop the muscle explosion building in Gretchen's supercharged body. Seconds later, Gretchen pumped her chest as large as she could, easily bursting the metal knot.
"Looks like my TITS are too big for your stupid trick!" she cackled, seemingly bigger than ever.
For the first time since her transformation, Mandy felt a little afraid. Gretchen's brute force was tough to match. Her sheer size made her a nearly impossible adversary to defeat. As Gretchen gloated, her muscles seemed to tighten and expand. It looked like she was literally soaking up the power of her momentary triumph--like beating up on Mandy was actually increasing her physical stature. But that was impossible...wasn't it?
Mandy came at Gretchen with desperate vigor, but the bigger girl had no problem intercepting the super-hero's strikes.
Filled with new confidence, Gretchen faked a yawn.
"When will you start trying?" she sighed. Mandy took the opportunity. She seized Gretchen around her curvaceous hips, lifted her with one smooth motion and tossed her as far as she could...