Gabrielle started to freak out. "No, no, no..." she whispered frantically to herself. "What's happened to me? I can't have just turned into a girl! What if mom or someone else finds me and thinks I'm some stranger? Oh fuck, please, I want to be a boy again!" Seconds after saying those words, another weird wave of sensations swept over her body, and she saw and felt it transform once again.
Her feminine facial features firmed up and turned masculine, and her voice deepened as her larynx protruded from her neck. Her proportions shifted to be larger, her muscles grew, her curves vanished and her figure firmed up, so she appeared to have a more boyish than girlish build. Her breasts shrank away and most of the sensitivity vanished from her nipples, and she bit her lip as she felt her vagina seal up and bulge outward as two lumps moved inside it, before her clit expanded to form a phallus.
Gabriel stared at her body, now male once again, appearing as if nothing had happened to it. Had he imagined transforming into a girl? Part of him still felt afraid to try it, but he felt too intrigued not to and was now pretty sure if he could change, it was a reversible process and one he could control.
He took a deep breath and said to himself, "Can I turn into a girl?" And sure enough, over the next minute his body demonstrated the answer. His face softened up and looked girlish, his figure shrank inwards and turned curvaceous and womanly, his nipples expanded and mammaries formed on his chest, his penis and testicles shrank away to be replaced by a clitoris and vagina. He became she.
"And can I turn back into a boy?" she asked in her girlish voice. Her body obliged. Her face turned firmer and more masculine, her figure grew outwards to be straight and manly again, her large chest shrank away and her vagina sealed up to form a scrotum while her clitoris swelled to form his penis. She became he.
Just a few minutes ago, Gabriel had been terrified- now he felt ecstatic. He could control his own body's sex! That would be an amazing act, and even better, it meant he could experiment with his identity all he wanted! He wondered who to tell first...