Despite her now huge size, Amy was shcoked at the speed she was moving at as she barrelled her way through the bathroom door. She didn't feel any pain and smiled wickedly as she saw Amanda high-tail it down the hallyway amd turn a corner.

"OH AMANDA!! I'M GONNA GET YOU, BITCH!!!" She yelled and her muscles tensed which made them bulge even bigger and get more vascular.

Amanda was really starting to panic as she heard her sister's heavy footsteps stomp into the floor and echo throughout the house.

Boom! BOOM!! BOOOMM!! Each step was getting closer. and Amanda knew it wouldn't be long before Amy caught up to her and take her gun from her. Amanda suddenly regretted turning her older sister into a muscle amazon. She felt running away would be pointless as AMy was almost on her ass and there was no where to hide in their house so Amanda decided it was time to fight. She would make herself an amazon as well. Amanda saw the stairwell but then heard Amy turn the corner and roar loudly. Her leg muscles erupted as she got into a pounce position and lunge at Amanda.

Amanda shrieked but managed to duck her huge sister as she sailed over her. AMy's bulbous tits knocked Amanda down but Amy fell all they way down the stairs and crashed into a wall which shook the bottom floor.
Amanda then ran all the way back to her room and locked the door. She then aimed the gun and fired at her torso and a bright energy shrouded her body as power began to build up in Amanda's petite body. Amanda felt a lot more confident now as she felt her clothes begin to fill out with rock hard muscle. Amanda gasped as her arms and shoulders bulged and became striated with bulging muscle. Her torso expaned as her pecs bulged and her small breatss expanded and stretched her bra. Amanda loved the feeling of power as it even turned her on. She looked down and could only see muscle as her shoulders bulged bigger, her traps thickened, and her pecs pumped up and pushed her jiggling tits out even more. Her shirt lifted up her stomach as she abs defined into a solid, ripped sexy 6 pack. Her hips widened against her shorts and her butt stretched them out as it began to show underneath them in the back, Her hamstrings and quads thickened significantly as muscle and veins just kept pumping more blood to fuel her growing muscles. Amanda was even getting taller as her height adjusted to the dense, big muscles she was gaining. Adding even more room for growth.

"I'm......getting... pretty.. damn... big!!" Amanda exclaimed as she heard her shirt begin to rip against her thick, shredded muscular back. Her shorts began to rip on the sides as her thick legs continued to grow. Her panties becoming more exposed and shriveling up to thong sizes as her leg muscles just thickened and became even more pumped up. Amanda was now the size of a light-heavyweight female bodybuilder at 6'0'' and felt more energy power up her body as she still continued to grow. She moaned and put her fists to her sides and raised her legs up on her big, sexy toes. This caused her entire body to literally double in size and all of her clothing suddenly came off in rips and shreds completely. Amanda licked her lips and she felt a gentle breeze on her powerful, muscular naked body. She brushed a few bangs to the side as her brunette mane flowed down past her broad soccerball sized shoulders. Amanda was huge and thickly pumped with dense muscle which easily rivaled Amy's size now. Amanda was now 7'2'' and 275 lbs of solid amazonian muscle. She was really vascular too as thick veins snaked their way throughout her pumped body.

"OOOOOHHHH YYEEEAAAHHH!!! This feeeellss sssssooo ggooooooodd!!." She moaned exotically as she was really horny from the sheer size of her huge body. She rubbed her hand along her left leg and felt thick cords of muscle in her quads just bunch up and bulge from her iron touch. This caused her to get even more riled up and her dense pussy suddenly began to wetten. Amanda flexed her right bicep and it bulged to the size of a coconut with a few veins spreading through it.

"Mmmmmmmmm... my muscles are so sssseeeexxxxyyyy and HHUUUGGEEE!!!" she moaned and made to play with herself as she felt a few orgams welling inside her ready to be released. But then there was a big, booming bang against the door that shook the walls in her room all of a sudden.

"Oh shit!! I forgot about that bitch Amy!! wait till she sees the new me!!" AManda said but tossed the gun under her bed.

She then looked up and smiled with a proud confident but sexy look as her enitre door frame shattered into splinters and through the dust as she saw the large silhoutte of her sister's huge muscular frame walk into her room. Amy walked closer to her sister and her stomps shook the room and her legs bulged tremendously with each mighty step she took until she was 10 feet away.

"WHAT THE FUCK?! HOW DID YO--" Amy suddenly exclaimed as she looked up at her 'little sister'. She had muscles that put her own pumped, shredded stature to shame.

"Surprised, Amy?! This does feels so damn good and I'm so huge and ripped. Bigger than yours' even!! Now we got some shit we need to settle."

SHe glared at her older sister and her muscles flexed proudly on her monstrous frame ready for a big fight.