The sun glared in Emma's eyes and she groaned, pressing her head further into the pillow. She was exceptionally comfortable, she thought, curling her legs up. Her bare skin skated over silken fabric, and the mattress beneath her was soft and fluffy.

Which was all a bit weird, because not only was her mattress in Mary Margaret's apartment a little too hard for her, but her sheets were made of cotton and she could swear she'd crawled into bed in her jeans last night.

Not wanting to open her eyes and leave the state of half-slumber she was residing in, she smoothed a hand over the sheets. Definitely silk. Had she spent the night in somebody else's bed?

Emma's eyes fluttered open and she squinted at the room around her. It wasn't Mary Margaret's apartment, that was for sure. Mary Margaret's place had a sweet, homey feel to it. This room was perfectly neat. It almost felt cold, with walls of silvery gray and bedsheets to match. Emma pushed herself into a sitting position and threw off the covers, raising her eyebrows at what she saw. A pale blue, silky nightgown had ridden up around her thighs.

Her thighs, which she could swear looked a few shades darker than they should.

Her legs themselves looked different, she thought. The structure was slimmer; they weren't as muscular as she was used to. She was also missing the tiny nicks and scars that she'd accumulated through the years. She reached down to pull the nightie back over her legs, noticing that her fingernails were perfectly filed and manicured.

"Mom?" A knock at the door made her jump and she pulled the sheet over herself once more. She recognized the voice - Henry's.

But...he was staying at Regina's.

"Henry?" She nearly choked over the word when her voice reached her ears. It wasn't hers at all, but she recognized it: dark and sultry, with a burn like liquor. It was a voice that had made her chest flutter and heat pool in her abdomen on more than one occasion, not that she'd ever admit it.

Regina's voice. She was speaking in Regina's voice.

The door opened just a crack and Henry poked his head in. "I'm going to school now." He squinted his eyes at her, his head tipping slightly to the side. "Are you okay? Usually you don't stay in bed this late."

"I'm fine, Henry, I'm just...not feeling well at the moment." Emma managed to get the words out fairly calmly, though she couldn't match Regina's manner of speaking. The patterns of her speech sounded odd in Regina's normally poised voice and she drifted off towards the end. She gave the best smile she could manage, the movement feeling odd as her lips-Regina's lips-slid over unfamiliar teeth. "Have a good day at school, okay?"

"Thanks mom. I hope you feel better." Henry flashed her a smile before ducking out of the door and closing it. Emma waited until she heard his footsteps die off as he pounded down the stairs and out the front door.

Emma sighed, running a hand over her face, only to pull it away when she felt unfamiliar curves and planes. Curious, she lifted a hand to her hair and ran it through the dark locks. They seemed to cut off much too quickly, though Emma knew it was exactly how long Regina liked her hair.

How the hell had this happened?

Regina? She immediately shook her head, dispelling the thought from her mind. What benefit would Regina get from putting Emma in her own body? No, Regina wouldn't take that risk. It was possible that Regina was now inside her own body, but if she'd wanted to impersonate her all she had to do was flick her hand and magic would allow her to appear and sound as her, without the risk of Emma messing up her own body. Gold, then? Same problem there: What would Gold want with switching them?

Emma groaned, the noise coming out deep and throaty. She wasn't going to think about the fact that the sound had an effect on her, even now that she was the one producing it.

She slid herself out of the bed, stumbling a few times as she got used to the feeling of walking on Regina's feet. Chances were that if she was in Regina's body, Regina was in hers, and if anyone would know how to reverse this, it would be her. She'd head to Mary Margaret's apartment and see if Regina had any idea what had happened, and more importantly, how to fix it.

She stopped abruptly when she caught her reflection in the mirror, realizing that she was still clothed in Regina's rather revealing nightgown.

She had to...get dressed.

Which meant getting undressed.

Maybe she'd try calling first.

It took Emma a good ten minutes of searching to find Regina's cell phone. For a woman who kept her home meticulously organized, she kept things in odd places. Emma found the phone in a drawer in the study, where Regina probably wouldn't hear it if it went off. Maybe that was on purpose.

Emma hit the power button and nearly groaned again when the screen glowed to life and prompted her for a passcode.

And of course, as Henry had told her before, the Mills didn't own a home phone.

Lovely.

She'd tried to get dressed as quickly as possible, and without looking at Regina's body as she did so. It had proved a hard task, especially when she discovered that Regina apparently didn't wear any underwear to sleep. She'd had to paw through Regina's drawers to look for something that wasn't lacy or sexy- apparently Regina had a thing for lingerie -and eventually managed to find a pair of microfiber boyshorts. She settled for the most casual clothing she could find in Regina's closet: a pair of slacks and a blouse. She tugged them on quickly, not wanting to remain unclothed for very long. It was awkward.

When she knocked on the door of Mary Margaret's apartment her hand was shaking, and she took a deep breath to try and compose herself. She was shifting back and forth in the pair of sneakers she'd dug from the back of Regina's closet - apparently the only shoe the mayor owned that wasn't some form of heel. She shoved her shaking fists into the pockets of her jeans.

She jumped when the door swung open, Mary Margaret peeping her head out before pulling it all the way open and stepping into the doorway.

"Regina! What are you doing here?" The schoolteacher tipped her head to the side, a mix of suspicion and curiosity crossing her features. She glanced down, taking in the causal outfit and the fact that the other woman was still squirming nervously. "Is everything alright?" She obviously had no idea what was going on.

"I, uh…" She panicked for a moment. Maybe she should see if Regina was actually in her body. She wasn't sure if she wanted her to be or not. "Is Emma home?" She eventually settled on the words, the question feeling odd in her mouth.