Amanda thought it over for a minute. She looked at the gun. The first time she used it she had set it to muscle growth setting 2, height gain 0, and gone from skin-and-bones Amanda to looking like a buff figure competitor. When she shot Caroline it was still on muscle growth 2, but height gain 5. Somehow the height gain must have augmented the muscle growth, because Caroline was more muscular than any bodybuilder on Earth. The gun was now set on muscle 1, height 0 from Amanda's demonstration for Caroline, and that last blast had taken her firmly into amateur bodybuilder levels of muscularity herself. She thought about how good she felt now, and then looked at Caroline. Despite her ridiculous outfit, Amanda had to admit that Caroline's new body was practically sexiness personified. She caught herself imagining what Caroline would look like under those pajamas. Amanda realized that her libido had been running out of control even since her own growth spurt, and that it got pumped into overdrive with Caroline's growth. She imagined herself with muscles like Carolines, exploring each other's bodies. She could feel a wetness between her legs and a deep tingling sensation start to grow in her chest as he nipples popped out.

She forced herself to focus on her conversation as best she could.

"OK, I'm in. But not here. We need to go somewhere private. If I grow to your size I'm going to end up shredding my clothes."

Caroline's face went blank for a minute as she mumbled, "Oh my." under her breath.

"We can't go to my place." Amanda said. "My brother is home and he's just the type to stick his nose in our business."

"Don't look at me! I'm not quite ready to explain my growth spurt to my da yet!"

"How about the rest rooms here?"

"The public bathrooms at a mall? Not exactly private."

"Good point." Amanda replied, "Hmm... well sometimes when we want to be alone, some friends hang out under the bleachers at school. It'll be dark soon, hopefully no one will be there."

The preparations began with a trip to the sportswear store. Caroline pulled a pair of XXXL sweatpants and hoodie off the shelf, but Amanda stopped her.

"No more hiding. If we do this we do it all the way." She put the sweats back and handed her a pair of black spandex short shorts and a stretchy yellow tank-top.

Caroline smiled and took the clothes to the change-room. A minute or two later she called out from the closet, "Are you ready for this?"

"Of course I am, why not?" Amanda replied.

"Oh, you'll see" Caroline giggled and walked out of the change-room.

Amanda felt her knees go weak and she had to sit down as she surveyed Caroline's body. The yellow tank top she'd picked out was stretched so tight over Caroline's colossal breasts as to appear like body paint. Hard nipples that never seemed to deflate protruded from the middle of each breast. Caroline's giant traps and boulder sized deltoids bulged out of her shoulders and massive lats spread out and stretched the fabric to the limit. Biceps and triceps bulged from Caroline's arms as the hung relaxed at her side, promising an explosion of muscle should the Irish girl decide to flex. The crop-top tank exposed every bump in Caroline's defined six-pack, not to mention a good bit of the bottom of her breasts.

Her lower half was as impressive as the top, where the black spandex short-shorts clung to Caroline's pumped up ass like a second skin. They stretched over thighs that resembled marble columns. In any pictures Amanda had seen before of bodybuilders, they were always deeply tanned, but Caroline had pale while, almost porcelain skin. It was an amazing effect, highlighted by a network of blue veins that criss-crossed all over Caroline's ripped physique.

Amanda was having a hard time breathing as she stared at the vision of Caroline before her. Meanwhile, the towering amazon laughed again at Amanda's reaction, which was obvious to her.

"Told you. Wait, it gets better" She smiled a dazzling smile as she raised her arms into a giant bicep flex. Amanda whimpered. She transitioned into something approximating a 'most muscular' pose but was interrupted by the sound of a tear forming in the back of her tank top, so she stopped.

"You're sure that's the biggest size they have, right? Hmm, guess we'll have to be careful."

Amanda gathered her concentration and stood up, walking over to the rack where they'd found the sweat-suits earlier, and tossed them to Caroline.

"Put these on, if you want me to function at a level above 'drooling vegetable'."

Caroline smiled and caught the sweats, pulling them over her over-developed physique saying, "Alright. For now." She winked at Amanda.

Even covered in what should have been baggy sweats, Caroline exuded sexiness. Caroline picked out a second pair of everything, paid for it all (she insisted) and the two were off to the school in Amanda's car.

Fortunately no one was under the bleachers that night. Amanda quietly stipped off her clothes. Despite her new, and incredibly sexy, muscular body, she felt completely intimidated by the overwhelming presence of Caroline's body. Despite the cold night air, Caroline stripped off her sweats, revealing again her insanely developed body.

"What? you're standing there completely stark naked! At least I'm covered up some!"

Amanda grabbed the gun and turned the height dial to 5, the muscle dial to 1. Caroline reached over and upped it to 2.

"If we do this, we do it all the way, remember?"

Finally all remnants of doubt and worry about how she was going to explain things was stipped from Amanda's mind. She wanted that body! She aimed the gun at her belly and squeezed the trigger.