Despite all of her drooling, you can't ignore the fact that Erika's back wasn't looking all too healthy. Sure, she tried her best to stand tall and proud, but those huge knockers in front of her were just too much for her poor back. As she was still imagining all the different scenarios she'd do with you now big cock, you sneakily decided to switch to the flashlights normal mode and turn the blue light, increasing the intensity almost all the way. Almost immediately, you can see her soft and feminine back pile on a bit of muscle. As soon as they wanted to explode in size after getting some much needed density, you stopped.
Now that you thought about it, you always liked fit girls. So you increased the intensity even more, but made sure to narrow down the beam as you didn't want to hit anything other than her abdomen. Like a fast chemical reaction, a sixpack rose to the surface while her waist stayed as narrow as can be. After they got quite hard, another set of abs began to show ever so slightly and faint obliques started to show up, that's when you stopped hitting her with the beam.
Now she had a strong, but still feminine back that could carry her huge boobs, as well as a really, really tight core that you could grate steel on. You could see the defined bumps invuluntarily flex with every step she took.
Looking back at your own crotch and then back at hers, you spontaneously decided to amp her arousel levels up even more as you shone a bright pink light directly it. Just thinking about you made her pussy pulsate like crazy. Now she was back at the start, with her back slightly bent. But this time not because of her heavy breasts, but her urging desire to devour your dick.
Your mind went back to your own desire of fitness girls, so you decided to partially fill that soft, fatty ass with some hard muscle mass. Thanks to the blue beam, her ass wasn't jiggling around nearly as much as before, if at all. Her butt looked as tight as can be and strong enough to crush an apple between its cheeks.
While you shine the blue light at your dick for some more time, you think about what else you would like to see on her. As your flaccid dick reached a whopping 10 inches in length, you had an idea and stopped to change the settings. You hit both of her thighs with an intense pink light, watching them grow in size, then you changed the beam to the same intensity but blue and watched those soft, big thighs getting more defined but no less feminine. You repeated these steps a few more times until just one of her thighs was as big as her waist, displaying thick and incredibly hard pillars of strength covered by a generous layer of silky fat. If her cheeks looked strong enough to crush an apple, then those trunks were powerful enough to destroy steel beams between them.
Just as the two of you reached the video game store, you had an amazing idea.