While having a girl's body like this was really cool, she didn't want to have to try and explain this to everyone she knew. So Andrea decided to wish her body would change back to a boy's- and to watch and feel it as she changed, of course.
Instantly she started to revert to her old self. Her hair tugged back to its old short cut, she felt something swell in her throat as her voice deepened again, and her jawline grew firm again. Her figure turned masculine again, her shoulders spreading out and her hips narrowing as her skin grew rougher and her figure less curvy. Her hands and feet enlarged and her arms and legs turned more muscular.
She felt a slight tinge of regret as her genitalia transformed back to masculine forms, turning less sensitive in the process. Her chest flattened and her nipples shrank back down, and she felt her vagina seal up and swell as it formed a scrotum. His scrotum, he realized- he'd transformed so much he didn't feel like a girl anymore. Soon after, he felt a throbbing through his crotch as his clitoris swelled and lengthened into a penis.
And Andrew was back. He smiled as he looked over his body- he'd just transformed himself into a girl and back with no hint he'd been one now, just as she'd looked like a girl with no hint of maleness before. Giggling to himself like a dork, he dressed again and prepared to head home. He might go back to the Arcade again sometime, but for now he'd had his fun with it.