Okay, I've had this in my head for a while now - and I've been writing it for about a month? So I thought I may as well start uploading, and see what happens from there. Rated M for future rape scene.

Reviews are welcome (as always), please enjoy!

Morgana strode into her room, slamming the door behind her. Her eyes were red-rimmed from trying to hold back tears, and her hair, for once, was in complete disarray. With a sob she threw herself onto her bed, grabbing a pillow as the angry tears finally flowed down her cheeks.

Arthur and her often fought; usually over silly, trivial matters. Some part of Morgana's mind was busy telling her that their latest argument was indeed nothing to cry about, but Morgana ignored it. How dare Arthur mock her, when he knew full well she'd never wished for this?

It had all started when Morgana was thirteen. That was when Uther forbid Morgana to continue learning 'masculine' activities: sword fighting, jousting, etc, and had instead hired a woman whose job it was to teach Morgana how to be a proper Lady. It was then that a distance formed between Arthur and Morgana; while Arthur continued his training to be a knight, Morgana was forced to remain indoors and learn the accepted etiquette.

Now, whenever Arthur and Morgana argued, it was usual for one of them to bring up the typical sexist attitude of Camelot that had caused the divide between them. Morgana had often wished that she'd been born a boy, or at least that Uther's attitude towards women had been different.

Curled up on her bed, hugging the pillow tightly, Morgana felt her fingers brush against something hard. Her hand latched onto it, dragging it into view as Morgana propped herself up, using the sleeve of her dress to dry her face while gazing at the velvet pouch in her hands. Slowly, she undid the drawstring and tipped the stone out onto her palm.

Morgana's eyes closed briefly as her fingers traced the smooth surface of the stone. "No use crying," she murmured to herself as the stone sent a rush of warmth along her arm. As it always did when she touched it, it was beginning to softly glow. "It's just how it is. I can't change it. No-one can."

Morgana sighed, lying back down as her sobs subsided. Her eyes closed again, while, unbeknownst to her, the light emitted from the stone gradually grew stronger.

If I could, though, Morgana thought to herself, I'd swap it around. If I were a man, I could take part in tournaments even. And if Arthur were a woman… she smiled at the thought. Well, then Arthur would be the one complaining about not being allowed to take part.

The stone began to vibrate. Morgana opened her eyes in surprise at the movement, and then she suddenly felt her whole body jolt.

Xxxxxxxxxxxxxxxxxxxxxxxxxx

Arthur was relieving his frustration in the way he normally did; by practising his sword twirling techniques. It seemed to help, in some small way, especially when he imagined the person he was angry with on the receiving end of the blade.

Stupid girl, Arthur thought to himself, swinging his sword in a complicated circle. It's just so typical of Morgana to start whining about the fact that she has to be a lady all the time. I thought she grew out of that years ago! Arthur slashed out at his curtains, neatly slitting a gash through the middle.

There was a clatter as metal hit hard stone. Arthur had dropped his sword and was now leaning against his bedpost, breathing hard as he tried to steady his nerves. He knew that something had suddenly racked his body, but how was he to know that, at that exact moment, the same thing had happened to Morgana?

Xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

"I know it's hard to believe, but I haven't actually been in the stocks today," Merlin explained, grinning in a slightly bashful way.

Gwen eyed the squished tomatoes that seemed to make up Merlin's outfit. "Really?" she asked, slightly disbelieving. "It's not that I don't believe you, Merlin, it's just that you do look like…"

"See," Merlin interrupted her. "I was innocently walking through town when-" He stopped talking abruptly as his entire body suddenly jolted and he bent forwards, gasping slightly. As the sensation passed, he glanced up and noticed that Gwen too seemed to have experienced it; she was leaning against the wall for support, drawing in deep breathes.

"Mer… Merlin?" Gwen asked quietly once she'd gotten her breath back. "What was…?"

Merlin shook his head quickly. "No idea. So, anyway, I was in town when I accidentally slipped on this potato someone had left lying around and went flying backwards into a cart of rotten tomatoes."

Gwen laughed, standing upright. "That is so typical of you, Merlin. Well, when I mean typical, I'm not saying you're clumsy or anything, just that you do seem to have a habit of…" She paused, looking flustered as usual.

"I'll see you later, Gwen," Merlin helped her out. "Bye." He smiled and began to walk off, but his insides were churning. That jolt he'd felt… that was magic, he instinctively knew. He just hoped that nothing bad would come of it, and that there would be no side effects.

If only he'd known then what was going to happen...

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The next morning…

Merlin stared at his reflection in the mirror, his jaw gaping open.

No! His mind screamed at him. This is not real. This is not happening!

Merlin had realised something was wrong before he had even opened his eyes. For starters, lying on his front hurt. Merlin had done it plenty of times, but it had never been this uncomfortable before. Which led to Merlin sitting upright, glancing down at his chest, and…

Jumping right out of bed and staring at himself in the mirror, his eyes widening with horror.

His reflection stared back at him. Merlin waved one hand uncertainly, and the reflection copied it. Yes, it was definitely his reflection, no doubt about that, but…

The mirror was showing a young woman dressed in Merlin's nightshirt. Her hair was the same dark shade as Merlin's and reached just past her shoulders; her skin was the same pale tone as Merlin's, and her eyes… Her terrified eyes were exactly the same as Merlin's. In fact, she looked just Merlin - except that her small breasts were clearly visible through the material of the nightshirt, which was uncomfortably stretched around her chest and hips, but also too large a size for her petite figure.

Merlin slowly glanced down at himself. Just to make sure, he raised one shaking hand and peered down his nightshirt. No mistake. The woman in the mirror was him. Somehow, he'd turned into a girl overnight.

There was a loud gasp from Gaius's room. Merlin swivelled round as there was someone knocked on his door.

"Merlin!" Gaius's voice called… although it wasn't exactly Gaius's voice. "Merlin, wake up and open the door!"

Panicking, Merlin quickly tugged the sheet off his bed and wrapped it around himself, trying to conceal his new form before he lifted the latch on his door.

For what seemed like a long time, Gaius and Merlin stared at each other. It appeared Merlin wasn't the only one who had mysteriously changed gender overnight.

Gaius was the first to speak. "Merlin?" he asked in a hushed tone, and only this time did Merlin understand why it sounded so different.

"Gaius?" Merlin whispered, bewildered.