Alan realized after a moment the gun had been on the 'Transgender' setting. That explained a lot about these sudden feelings. It felt like his hormones were acting up, making him feel weird and sensitive in ways he'd grown to be able to suppress by his age. But more than that, it felt like deep inside him something fundamental was changing.
A shiver ran through his face, and when he looked at it in the mirror it looked softer and smoother all over. He noticed his arms and legs had slimmed and his hands and feet had shrunk. He panted and groaned in a high-pitched voice, realizing he didn't have a man's voice now.
When he felt a tingling sensation in his chest he hastily pulled off his T-shirt, and his nipples perked up and widened. He rubbed at them eagerly and moaned in surprise at how good they felt to touch, and his body sprouted feminine curves as his breasts developed. His shoulders narrowed, his figure curved inwards, his hips widened and his butt filled out.
By now, even Alan's name felt like an odd fit. He pulled off his jeans and underwear to see his hard cock, practically the only part of him that reminded him he was a boy. As it shrank and his balls moved up inside him, his memory of being a boy was eclipsed- memories of being a girl came to feel more natural. She felt a vaginal opening form from what had been his scrotum and his penis settled into place at a much reduced size to form her clitoris.
She remembered the girl she now was as the changes came to a stop. Her name was Ally. As for what else, well, I'll let you decide...