I was given a challenge to write something with Spencer Reid, Sam and Gabriel, three of my favorite characters from my fandoms, and was told it had to involve a gender play/change/swap somehow, and I was given a time limit. My time's up and this is what I came up with. I hope you guys like it and if you'd actually like to see more of it, please, let me know. If you don't, it's all good :) I'm open to any opinions, preferences and ideas, too, so speak up if you wish!

Set about mid season 7 for Criminal Minds, and around the start of season 9 for Supernatural. Because this AU and, well, because I want to, we're going to go with the idea that Dean stopped Sam from doing the Trials and Gabriel showed up at the hospital instead of Gadreel, having found himself brought back when the angels fell, and he healed Sam and now the four (Sam/Gabe and Dean/Cas) are all staying at the Bunker. K? K! Not that bad, really. I've seen people randomly throw readers into a worse AU than that right from the get-go, so I figure I can do this. It's not that big a leap really. :)

Since FF doesn't have tags the way that AO3 does, I'm putting tags here to warn you guys. Relationships: past Spencer Reid/Sam Winchester, Gabriel/Sam Winchester, Slight Dean Winchester/Castiel, potential Spencer Reid/Sam Winchester/Gabriel. Tags: Het and Slash, potential threesome, not sure yet. Fluff and Smut, Witch Curses, Gender or Sex Swap, Girl!Spencer, Past Relationship(s), past angst, Friendship, Friends With Benefits, Slow Updates, Mostly wrote this for fun and in response to a challenge, Feminine pronouns because it's easier, Human Castiel. That covers it!

This was written by K, for J, for fun!

He really hated days like this.

Spencer mentally cursed in every language he knew as he darted round the fallen log and further into the forest. This hadn't been at all how he'd expected this afternoon to go. This was supposed to be an interview; just a simple interview. The thirty year old FBI agent hadn't come here expecting to find their Unsub. Yet here they were, chasing down a young woman that Spencer honestly hadn't suspected of anything whatsoever. She was supposed to just be a witness. He and another teammate, Derek Morgan, had come here to ask her a few questions. Now they were trying to catch her before she could get away, and Spencer was frantically trying to figure out how to stop her without letting his teammates know what was really going on.

When they took the case, the BAU hadn't had any idea what they were truly getting themselves into. It had seemed like any other case. Difficult, yes, and a bit confusing, but still, just a case. Then, once they'd arrived and actually started to work, it quickly became apparent that this wasn't just your average case. To Spencer, the only member of the BAU team to actually know a little something about the more supernatural side of the world, he quickly came to suspect that this might just end up being a little more than they could handle. Later, he would hate how right he was.

They local police had five bodies by the time the BAU were called in. Each was female, each in their twenties, and though none of them shared a general physical description, they all had one thing in common—they were all women that would've been considered 'gorgeous'. The 'alpha female' type. Aside from that, nothing seemed to tie them together. Two were blonds, one redhead, and the other two were brunettes. They were different heights, different weights, different builds entirely. All in all, victimology was almost impossible to pin down.

Then, this is where things started to get weird.

There were errors in trying to identify the women. The first two had their DNA run and what came up in the databanks didn't match them at all. In fact, the closest genetic matches that came up were for men. Eventually, the same was established for the other victims as well. At first the police thought that these people might be attacking twins. But it didn't make any sense. None of them showed any record of being twins and every family they spoke with was firm that their child was not a twin.

To make matters stranger, the coroners checked the bodies and found things such as body scars, birthmarks, tattoos. What they found was that each woman was a match, down to every last scar, to the male counterparts their DNA claimed they were closely matched to. As unlikely as it seemed to everyone, these women had once been men. Only small things, aside from the glaringly large obvious one, were any different. The women were smaller than the men they'd been. Anywhere from two to eight inches shorter and ten to thirty pounds lighter. No one had any sort of explanation for it.

No one except Spencer. But what explanation he had, he couldn't exactly voice.

This wasn't the first time that the BAU had come across something supernatural in one of their cases. For most of his life, Spencer had known about the existence of the supernatural. Hunting had been passed down to him through his mother's side of the family and he'd grown up with that knowledge. But, much to his mother's joy, he had chosen a different lifestyle than that of hunter. He'd gone on to college and then, from there, the Bureau. But that didn't mean that his knowledge didn't get put to use. He had a few contacts in the hunting world, one of which he trusted absolutely, and he often passed a case along if he came across one that was more for a hunter than an agent.

He would've done the same with this one, too, if he'd had enough time. Because it was quickly becoming apparent to Spencer that the one his team was after wasn't a regular person. Everything he saw suggested that they were after a witch. Someone strong enough to turn men into women, for some reason or another. He'd already sent off a brief text to a hunter he trusted to try and get someone out here before things got much further out of hand. This wasn't something he could just handle on his own.

As he ran now around another tree, he wished he'd sent that text off earlier.

When he and Derek had gone to the house of Melissa Stoddard, all they'd planned on doing was questioning her as she'd been listed as a witness from the scene where the second body had been dumped. It was just happenstance that Spencer had noticed a few things inside of her house that had made him suspicious. Little random items here and there that might not look like something to anyone else but that sent his instincts humming. Unfortunately, he hadn't been the only one to notice things. Melissa had seen Spencer looking around and she was quick to make the connection. That had been all it took to set the mentally unbalanced woman off. "Hunter" she'd hissed at him. Then, with a blast of power that Spencer knew had baffled Derek, she sent them flying back before taking off into the woods.

They had to catch her before she got too far. Spencer could figure out how to try and explain things later. For now, they had to catch her, had to stop her before she got to wherever she was running. He was afraid he had a pretty good idea what lay ahead and he didn't want to know what would happen if she reached it. He'd seen and heard of plenty of witches who set up personal altars out in the forests. Better to do some rituals with real privacy.

The trees broke just ahead and Spencer hit the clearing just a few minutes behind. What he found was exactly what he'd been afraid of.

Melissa stood in the middle of the clearing right next to a stone altar, with Derek a few feet away from her holding out his gun.

"Melissa, put the knife down." Derek called out. He had his gun in his hands, firmly trained on her, and Spencer saw for the first time that, yes, she held a knife. "I don't want to hurt you."

"I showed them the truth!" She was shouting just as Spencer reached came out of the trees. "

"No!" Her voice was high and shrill and it carried an edge of hysteria to it that said she wasn't entirely in her right mind at the moment. "You think you're so much better! You don't know what it's like to be me, to be a woman in this world! But you will. I'll show you, just like I showed those playboys, those little bastards who thought they were so great, that they could just take anything they wanted from a woman! I showed them what it was like!" To Derek's surprise, she quickly sliced the knife across her palm and the air around them suddenly seemed to crackle.

It wasn't a conscious decision that Spencer made next. He didn't stop to think about what he was doing. All he knew was that there was power in the air and it was being aimed directly at one of his closest friends. Before he could even think about it his feet were already moving.

He hit Derek and shoved him just as the power in the air slammed forward. It hit his body with an electric jolt and then he was flying through the air to land on the ground, hitting and sliding until he slammed against a tree. Pain gripped him from head to toe and every muscle in his body was twisting like taffy. A scream ripped its way past his lips as his whole body convulsed. His head slammed back against the ground and then he curled forward, trying to wrap himself up, another scream ripping free. His body was twisting and burning and, oh God, it hurt it hurt. Through the sound of his screams, he didn't even hear the other voices crying out, never heard the gunshots that filled the air.

The pain went higher and higher until the whole world whited out under it and then it all went dark.

When Spencer came to again he felt like he'd taken one hell of a beating. Every inch of his body ached. Even his hair hurt and he hadn't known that was possible. Not only did everything hurt, it all felt wrong. His whole body felt wrong and strange to him. The scrape of his clothes against his skin felt like sandpaper as he tried to shift and a low whimper slipped free. Oh, God, what happened to him? He could remember coming up on the clearing, the woman gathering up her power and chanting something, and he remembered knocking Derek out of the way, but—after that, there was only pain. Pain and then dark. What had happened to him? What had her spell done?

The sound of voices broke into Spencer's jumbled thoughts. Lying still, trying to breathe past the pain that was slowly starting to fade, he turned is ears to listen to what was being said. It only took a second for him to be able to hear past the low sound of his heartbeat in his ears.

"…not possible!" Someone was saying. It sound like, like Aaron, maybe?

The next voice was louder and much easier for Spencer to understand. "I'm telling you, that's Reid! I saw it!" Derek said furiously. "I don't know how, but it's him!"

"He's right, sir." Emily piped up, her voice just slightly hesitant, with a layer of worry that had Spencer tensing instinctively. "I can't…I wouldn't believe it if I hadn't seen it, but I saw him fly back and hit the tree. And I didn't see anyone switch places with him before we got over here. That's Reid."

What were they talking about? Why didn't Aaron believe this was him? What did that witch do to me? Spencer's heart started to pound as he slowly, oh so slowly, opened his eyes.

The pain was becoming more and more manageable the more that he woke but it was still present. Even his eyelids ached as he blinked them open. They still worked, though, and that was a plus. He could see. He wasn't blinded by whatever the witch had done. Something had to have changed, though. If his team was nearby freaking out over him—unsure, it sounded, if he even was still him, and wasn't that terrifying—then something had to have changed. He just had to wake himself up enough to figure out what. Ignoring the shiver of fear that sent through him, he forced his aching arm to move, his palm coming to rest flat on the grass right in front of him. The sight of his hand froze him in place so much that he didn't even register his friends turning towards him. His movement had alerted them that he was awake and they all rushed over to him, only to find him lying there staring at his hand. A hand that was smaller and daintier than it was supposed to be.

The witch's words echoed in Spencer's mind, the things she'd been shouting at Derek when Spencer had arrived, and it was all piecing together in his mind with the facts from their case, the bits of information about the victims, and the all-around sense of wrongness that he felt. His breath caught in his chest and his heart pounded so loud in his ears it blocked out all other sound. Wide eyed, the genius looked down, already knowing what he would find. Knowing and seeing were two completely different things, though. His gaze landed on his chest—a chest that was sporting a few things that definitely hadn't been there before. "Oh God." He breathed out. The sound of his voice, a distinctly feminine voice, had him repeating the words again, louder this time. "Oh, God."

"Reid?" Derek dropped down on one knee in front of him, one hand reaching out and hesitating only briefly before it closed over his shoulder. "Reid? Are you okay?"

A shudder ran down Spencer's body—wrong, wrong, this is so wrong, not me, this isn't me!—and his breath caught once more in his chest. "Okay?" He looked up at Derek and knew that the color had drained from his face, that he was wheezing, but he couldn't stop it. "Am I okay? Are you actually asking me if I'm okay?" The last word came out as a screech that had all of them wincing. "That witch turned me into a girl! A girl!" Realization suddenly hit and Spencer pressed his hands—too small, too soft—against the grass and tried to scramble up. "Where is she? Where'd she go? Melissa, get out here and fix this, right now!"

"Reid…" JJ said softly.

Even as Spencer heard his name said in that low and worried tone, his eyes found the body on the ground by the altar. He froze, kneeling on the hard forest ground, and stared at Melissa's body.

"The others shot her when they came in." Derek said lowly. He was still kneeling beside Spencer, his hand still on Spencer's shoulder. "They saw you lying on the ground screaming and me trying to get up and they assumed the worst. It was a reasonable assumption, Reid. We had no idea that she…"

The profiler trailed off, and Spencer picked up his dropped sentence. "She was a witch. A powerful one, if it's still in effect with her being dead." And his best chance at having this spell or curse removed. For it to still be active with her dead it meant that she'd been a powerful witch, which meant that it was going to be difficult if not impossible to change him back. It was definitely going to take more than any knowledge that Spencer had.

"A witch?" Dave repeated slowly. He sounded like he didn't quite believe what he was saying, yet at the same time how could he deny what was right in front of his eyes?

Shock and pain were fading away to a strange sense of numbness for Spencer. He knelt there in the grass and dirt and stared at Melissa's body and knew that he should be panicking. Yelling, screaming, crying, something. But all he could do was kneel there and stare. When he spoke, his voice was flat, empty of almost all emotion. "There's a whole world out there you don't know about. One that I've worked very hard to keep away from you all. Witches are just one of the things you should worry about."

It was Aaron, ever the practical one, the leader, who stopped this before it could get much farther and pulled them all back on track. "Explanations of all of this can wait." He told the group firmly. "Right now, the how or the why aren't what are important. What we need to figure out is what we're going to do. We've got a dead…witch, by her altar, an agent changed to female, and a handful of bodies back at the morgue that I'm assuming went through the same thing that just happened to Reid. We need to make a plan and then call in the locals to process this crime scene."

That steady practicality gave Spencer something to grip on to. Something to keep him from drifting off in the numb shock that had taken over his whole body.

"We can't take him back to the Bureau like this." Dave said with a shake of his head. His usually happy face was creased with worry. "They'd turn him into a science experiment."

That thought had Spencer shuddering. No, that was the last thing he wanted to have happen. They'd lock him away and never let him out again. "No one else can see me like this." He told them. There was only one thing that he could think of to do in this kind of situation. The only hope that he had, really. Drawing his arms in, he wrapped them around his waist, trying to ignore the strangeness of this new body as he did so. Still staring at Melissa, he told them "There's someone I know that's in the life. If there's anyone who can think of way to fix this, it'd be him. He's what you'd call an…expert."

"A supernatural expert?" Emily asked skeptically.

Spencer nodded. "Yes." For the first time, he made himself turn, forced his body to turn around so that he could look at his friends. They were all watching him with different degrees of shock on their faces. But Aaron…Aaron looked calmer than most, that steadiness that he was known for, the one that made him a great leader, right out there in the open. Seeing it steadied Spencer a little more. It provided him with a solid ground on which to gain some footing. Their eyes locked briefly. "You trust this person?" Aaron asked finally.

That was an easy answer. "With my life."

"Then make the call. Right now, it's the only hope we've got."

"I can't…" Pausing, Spencer looked from one to the next, hoping that they would understand this. "I have to do it alone. The life he lives, it's not exactly safe for him to be around a group of Feds."

"Why not?" JJ asked. She had moved to stand at Spencer's other side, opposite Derek.

Surprisingly, it was Dave who answered, though he phrased his answer like a question as if not quite sure about it. "Some of these supernatural, things, they look human, don't they?" He caught the surprised looks from the others and shrugged. "What? I've come across some bodies in my time that…well, let's just say they didn't make sense."

"I don't care. We can't just send Reid off on his own!" Derek exclaimed. His hand tightened a little on Spencer's shoulder as if to keep his friend there with him.

Spencer licked lips that felt a little fuller than normal and tipped his head to look up past his bangs. "Doing what a hunter does puts them at opposite ends of the law a lot, even if what they're doing is helping to save people. This person…he's my friend, and I won't put him at risk, Morgan. I have to do this alone. It's the only chance I have to get this fixed." He met Derek's eyes and held his gaze, something that they all knew wasn't easy or comfortable for him to do, and which added an extra weight to his words because of that. "I trust him, Morgan. Now I need you guys to trust me."

They didn't have time to argue this. Spencer knew that and so did the rest of them. They couldn't take the time to argue. They needed to get Spencer out of there and the locals needed to be called in if they weren't already on their way. Derek had called the team as they'd started to run, that's how the others were here. But that meant that the local cops couldn't be far behind them. In fact, Spencer was surprised that they weren't here yet.

As if something had heard that thought and decided that they needed to screw with him more, he heard the sound of people coming towards them. Now there really was no more time to debate anything. Spencer scrambled up to his feet, one hand clutching at his suddenly too-big pants. Derek's hand moved down under his elbow to help him reach his feet. His legs only shook for a moment before he got them steady under him. "I've got to get out of here before they get over here."

There was just a second's pause and then Aaron looked to Derek and nodded at him. "Get him out of here, back to the motel, and then get back here. I'm going to need everyone here if I want to keep the locals from getting suspicious. Reid," He turned his sharp gaze to Spencer next. "Keep your phone on you at all times and I want an update tonight on what's going on. I'll respect your friend's need for us to stay distant, but that doesn't mean we're leaving you to handle all this on your own. You need us, we'll be there as fast as we can."

Warmth filled Spencer and he really wished he had the words or the time to express just how much that meant to him. But the sounds of the officers were getting closer and there was no more time to do anything but run.

(Because it's easier for me, I'm going to refer to Spencer with feminine pronouns now. Mostly because otherwise I start to forget he's in a female body at the moment, LoL. So, yeah, enjoy)

Getting away from the crime scene without being noticed wasn't all that difficult. At least, not once Spencer convinced Derek to go and get the car and meet her at the road just ahead. Cops were already all around Melissa's place. So, wrapped tightly in a sweater that was now too big, Spencer tried to ignore the strange feel of her new body and waited hidden by a tree until a familiar SUV pulled up on the side of the road. She rushed out, tripping over her own two feet along the way and just barely managing to catch herself on the side of the SUV. When she slipped inside and shut the door, she found Derek smothering chuckles. "Shut up." She grumbled, reaching for her seatbelt. "My shoes don't fit right. They're too small!"

A smirk curved Derek's lips. "Uh huh. Whatever you say, Reid."

She shot him a glare before turning her focus towards settling the seatbelt on. Trying to figure out how to lay the strap only deepened her scowl. How on earth did women deal with these? They were beyond uncomfortable! She gave a brief moment of thanks that the body she'd changed in to wasn't as amply endowed as, say, Penelope was. Spencer knew nothing about things like cup size and couldn't even begin to make an estimate, but it wasn't as bad as she knew it could've been. She'd seen the bodies in the morgue and the DNA matches for the men; she knew how drastically some had been changed. Her change, in comparison, was more—she hesitated to use the word natural. But the body that she'd changed in to seemed to be quite a bit like before, only, softer, and curvier. A more slender waist, a bit of flare to her hips, and of course, the obvious changes. Otherwise, she was still the same height by her guess, still long limbed and lanky. It was her, it was Spencer, just, what she would've looked like if she'd been born female.

The shifting pronouns in Spencer's mind were a pain in the ass to deal with. It wasn't like gender had ever been something that Spencer held to any high standard before, at least not personally. Until this was over, using the feminine pronouns was probably going to be best, just to avoid confusion.

"You're awfully quiet over there, kid." Derek's voice interrupted her thoughts. She looked up to find her friend sneaking a look over at her. "There aren't any more side effects or anything like that, are there? No more pain or anything?"

The honest concern in his tone had her softening her reply from the grumpy tone that had almost come out. "I'm okay, Morgan. No pain." It was true, too. The residual pain that she'd been feeling wasn't there anymore. "Just…it feels strange."

"I can't even imagine."

She resisted the urge to snort. That was an understatement. A buzz from her pocket distracted her and she pulled her phone out. There was a text message on there and she sucked in a sharp breath when she saw who it was from. 'We just hit town. Meet? – W' was all that it said. She stared down at it and felt such a well of gratitude in her it took away her breath and her voice for a moment. Oh, man. She'd forgotten entirely that she'd text him earlier in the day about the case and what she'd suspected. He must've started heading towards her immediately, which was perfect. It was exactly what she needed. "Oh, thank you."

Derek's eyes shot briefly over to her. "What?"

"The person I told you all I was going to call? I had sent him a text earlier to let him know that I suspected this case we were on was supernatural in nature. Apparently, he's came right out, because he says he's in town."

"Really? He's already here?"

"It appears so." She fumbled her phone for a second as she sent out a quick reply. '911. Meet ASAP. Where are you?' The text would scare him, but it would get her point across and it would get a quick reply, she knew. Once the text was sent off, she bit her lip and thought about what to do, about what was the best plan here. The quick reply she got to her text helped make that decision for her 'Sunview Motel, 42. Not alone – W'. Spencer looked up and out the window and saw that they were downtown, close to the motels. Not just the one the BAU was at, but the Sunview as well. She easily placed that on her mental map of the city. "Morgan, pull over up here." She said, pointing to an empty spot up ahead by the sidewalk.

"What?" Even as he asked, he was already flicking his blinker on, preparing to move over.

"I told you I had to go meet them alone." Spencer reminded him as she pulled off her gun and holster and set them down in the backseat. Once they were off, she moved her fingers to her belt, pulling it tighter in hopes of keeping her pants on. The clothes would look baggy on her but at least they'd stay up. "He sent me his motel and I'm going to just head straight there. It's not far, I can get there on foot."

He slid the SUV neatly into the open spot and shifted it into park before he turned to look at his friend. Worry was written all over his face. "Reid…I don't like this. You shouldn't be going alone. Especially unarmed."

A small smile touched Spencer's lips. She hid her worry as she'd learned to do such a long time ago and put on her most reassuring look. It was a skill she'd learned as a child while trying to soothe a mother who was convinced that the world was out to kill them. "I'll be fine, Morgan. Really. I've known this person since college, okay? I can trust him."

"You'll call, as soon as you know anything?"

"Yes, Dad." She teased.

It had the desired result. Derek rolled his eyes at her and shoved at her arm. Some of the worry had melted off his face and he managed to give her a smile, albeit a small one. "Be safe, kid. Give me a call if you need me to come kick some ass."

"I will." Unhooking her seatbelt, she opened the door and climbed out, giving him one last look and one last smile. "Tell everyone I'll call tonight."

She stood there on the sidewalk for a long moment and just watched as he pulled back out into traffic once more. Though she'd told him to go, had practically pushed him away, for a moment she felt cold and alone standing there. She wrapped her sweater a little tighter around herself despite the afternoon sun. Tucking her hands into her armpits, she turned herself in the direction she needed to go and set off.

Getting used to walking in this body was something rather strange. Honestly, if she'd thought about it, she wouldn't have pictured walking as something so different. But it was. Some things that she was used to were no longer there and other things were new and threw off her balance. Her hips, for one. They had a natural sway to them that felt a bit odd. Trying to stop it only made her walk like she had a board for a spine, though. And her hair…it felt longer than before, and just a bit curlier, which meant it was constantly blowing in her face. She kept having to brush it back and each time her fingers encountered the smooth skin on her cheeks it was a jolt.

The Sunview motel was only two blocks away from where Derek had dropped her off. Even with her too-big clothes and too-big shoes and strange new body, all of which made it the strangest walk ever, she got there quickly. Finding room 42 wasn't difficult, either. It was bringing herself to knock on the door that was difficult. Not alone, his text had said. There was only one person she could think of that he meant. Under normal circumstances, that wouldn't be that big of a deal, though she'd never been fond of meeting new people. But right now? Right now, the logical part of Spencer knew she could use all the help she could get, but the rest of her wasn't all that thrilled at meeting someone new at a time like this.

However, there was no way around it. She needed him.

Steeling herself, Spencer wrapped one arm tight around her waist and lifted the other hand to knock firmly on the door. There was a brief pause as she stood there and just held onto herself. Then suddenly the door was being pulled open and a familiar figure was standing there in front of her. Spencer met curious hazel eyes and felt herself relax ever so slightly. "Sam."

Sam Winchester stared at her for one brief second before his eyebrows shot up and his eyes went wide with surprise. "Spencer?"

She smiled shakily at him. "Surprise?"