As the smoke from the explosion faded, Janey and Sally could see Amanda's petite figure, now covered with subtle muscles.

"Amanda?" they said simultaneously, looking puzzled.

"Are you... responsible for all of this?" Asked Sally, her gaze moving from Amanda to Janey and back.
"If you are..." said Janey, "You had better tell me how you made us strong."
Amanda, in her turn, just smiled. "You mean.. like this?"
As Amanda spoke, Sally could feel her muscles expand. She felt unimaginable power and took the chance to lunge at Janey. Her punch hit Janey in her back, and although Janey could feel the blow, it barely hurt her.
"Well you sure got stronger." Janey sneered at Sally and backhanded her into a house nearby. She then began to advance towards Amanda.
"You should tell me how you do this, Mandy." she said.
"It won't help you. There's no way you can do what I can do now..." Amanda complied, still smiling from the ecstasy of her previous orgasm.
"Oh really?" Janey said, plunging her fist into Amanda's midsection. Amanda tensed her muscles but Janey's fist was too powerful and she was painfuly sent flying back to hit an apartment house nearby.
"Owww," Amanda said, getting up. "You'll regret this."
"Oh really?" Janey said, advancing forward.
"Yes," Amanda concetrated on getting stronger... a lot stronger - and pretty soon she felt the power pouring into her. Her muscles first expanded, then hardened, then expanded again... Her abdominals formed into eight bricks of muscle, prominent and defined, her breasts were made of solid muscle... Her neck expanded, sporting veins and being supported by large trap muscles, leading into massive, wide shoulders and an incredible, sexy, muscular back. As her transformation stopped, both Amanda herself and Janey looked at her new body. While she was still smaller than Janey by a considerable amount, she was still larger than most men alive, and was definitely harder.
Amanda began rubbing her muscles as Janey ran towards her and plunged her fist into Amanda's muscular tummy, right about her navel.
"YOWW!!!" Janey cried, as her fist collided with muscles far harder than diamond. Her hand throbbed with pain as Amanda looked up at her with an arrogant smile.
Janey punched Amanda with her left hand at her neck, only to bounce away again in pain.
"What the heck!!" Janey screamed, as she punched Amanda's body over and over again.
"He he," Amanda giggled as Janey's fist bounced off her steely flesh. First her left breast, then her belly, her right breast...
"Argh!!! Die, you stupid bitch!!!" Janey screamed with frustration as she proceeded to hit Amanda with her supercharged punches. She hit her left shoulder - nothing. Her trap muscles, her tummy, her arms... nothing. Only pain felt was on Janey's end. She was frustrated and hurt as Amanda looked at her, smiling with confidence and arrogance.
"Stop smiling at me!!!" She yelled, nearly ready to cry, and plunged her fist into Amanda's belly. "OWW!!"
"He he. Wipe the smile off my face, super-girl. Wipe it off!" Amanda let out a giggle, clearly amused.
Janey pulled her fist back and hit Amanda on her lower lip and chin. Her hand bounced away in pain.
"Hehehe. I didn't even feel that." Amanda said. Janey punched her again, in anger and frustration, in her cheek. Janey felt terrible pain as the sound of bone cracking was heard, and she realized she'd shattered her hand.
"Oh god oh god oh god, you broke my fucking hand!!!" She yelled, punching Amanda's abs with her good hand, and bouncing away in pain.
"Aaaargh!!!!"
"Hahahaha. I'm sorry, did that hurt? How about that?" Amanda flicked her pinky at Janey with little effort, sending her flying through a few blocks and finally coming to a stop 4 miles away.
"That felt good.." Amanda purred, deciding she wanted to use her new power again. She moved forward towards Janey, who was failing to get up after being knocked out by Amanda's little finger.
"I think I could use a little more power, you know?" Amanda said as she prepared to charge herself with some more of the infinite energy she possesed.