AN: AU where Lena never moved to National City.

Lena was beginning to think her cottage was haunted. She would put something down in one place and when she turned around it had been moved somewhere else. The whole idea was ridiculous of course, her mentor in the magical arts had assured her that there were no such things as ghosts. When she'd moved into the cottage, trying to escape her family's legacy, there had been nothing to suggest any problems. It had been five years since her brother had been sent to prison, five years since her she'd had her mother's legacy dragged up by the media and been given the information that let her find her mothers old friend. That was when she had discovered magic, when she had been given the chance to be someone other than a Luthor.

Leaving everything she knew behind, Lena had thrown herself into learning magic and hiding from the world. She'd chosen the cottage because of it's location, remote enough for privacy, but close enough to civilisation that she could purchase whatever she needed.

"I am not leaving," she told the pot containing her tea bags as she picked it up and moved it back where it belonged. "I don't care if you try to scare me or plan on haunting me, this is my home."

"H..."

Lena looked around, there had definitely been a voice. She knew she was alone in the cottage, she had magical wards up to warn her if anyone approached within two miles of the land she owned and additional wards around the cottage itself.

"Who's there?" she asked.

"Hel..."

Lena backed into the kitchen cupboards as she tried to work out where the voice was coming from, "I'm a witch, and if you don't leave I'll find some way to make you."

"Help."

"What?" Lena took a deep breath, then moved over to the cupboard where she kept her spellbook.

Muttering the incantation to unlock the cupboard, she pulled out the book and started looking through it. She'd been told ghost didn't exist and she'd never seen anything about dealing with them in there before. There were warnings about trying to contact those who'd died, her mentor had filled that in with some rather gruesome tales, but nothing about ghosts. Had someone tried contacting a spirit in the cottage before she moved in? Was this a leftover part of a spell?

Sometimes with magic, she just had to use her instincts. Lena closed her eyes and clearly pictured what she wanted to do - be able to see the person speaking. She spoke what she hoped were the right words and opened her eyes.

A blonde woman was standing in front of her. Lena screamed.

It turned out, when Lena was calm enough to speak to the woman, that she was actually an alien. The ghost-like effect had been caused during a battle with another alien who had managed to separate her from her body.

"I woke up and discovered that no-one could see me. My body was lying there, while I was walking around and everyone ignored me when I tried talking to them. There was nothing I could do."

"Where was this?"

"National City."

"And was it Halloween?"

"What?"

Lena gestured to the outfit the woman was wearing, a suit similar to the one worn by her brothers enemy - Superman.

"Oh no, I'm really Supergirl. Wait, do you not know that?"

"I try to avoid the media. So let me guess, you're just like Superman?"

"I'm his cousin. Or, rather, he's my cousin as I'm technically old than him. Long story."

"Great. I moved out here to avoid all that and somehow you managed to find me anyway."

"Can you help me? I've been watching you, I know you're a witch and well, that's the kind of power that made me this way, so..."

"I'm not a bad witch," Lena told her.

"I didn't say you were."

"Well now that you're visible you can go back to your body and get Superman to help you."

"Can't you do something?"

"Making you visible was a long-shot, I thought you were a ghost."

Supergirl smiled, "I don't think ghosts exist."

"Yeah, well, some invisible force was moving things around when I wasn't looking."

"I tried moving stuff in front of you, but it was really hard and I couldn't even do that back home. It only worked on things you'd just touched, maybe somehow your magic was still on them and that's why I could move them?"

Lena frowned, "perhaps."

"So maybe your magic could help me against a Fifth Dimensional Imp who can also use magic?" Supergirl smiled at her, "and maybe get me back into my body?"

"No," Lena shook her head, "I moved here to be alone and I'm not fighting anyone, magical or otherwise."

"But they're a danger to everyone on Earth. We need your help."

"No, you don't. There are other witches out there, go find one of them and ask for help."

"You're the only witch I know. How would I even find them?"

"I haven't got a clue, but you're Supergirl I'm sure you'll figure it out. Now please get out of my home."

"But..."

Lena silently pointed towards the door. Supergirl looked like she was about to say something else, but changed her mind and walked away, right through the door. Lena counted to five, then gave a sigh of relief.

Two days after she had left the witches cottage, Supergirl came back. This time she brought company. When the DEO agent knocked on her door, Lena wasn't surprised. While she tried to avoid the outside world, she still loved technology and tucked away under the floorboards in her bedroom was a laptop with the ability to connect to the internet. She'd been checking the news for reports of Supergirl's recovery, but there was nothing so she knew she would be back.

Lena ignored the knocking on the door an continued watering her plants. She forgot that Supergirl could pass through the walls.

"Hi, me again," Supergirl greeted her, before sticking her head through the front door and telling the DEO agent on the other side that the witch was home.

After swearing from the shock of having a head appear through the door, the agent opened the front door and stepped inside the cottage.

"You have got to stop doing that," she told Supergirl.

"It's only happened... twice, three times at the most."

"Once was more than enough."

Lena watched them with interest, they were acting more like friends or... siblings? Was that possible? She cleared her throat.

"I don't believe I gave either of you permission to enter."

"Agent Danvers, FBI," the dark-haired one spoke, holding out a badge.

"FBI? Not DEO?" Lena asked.

"How do you know... wait, aren't you...?"

"Lena Luthor," she acknowledged.

Agent Danvers swore, and reached for her gun, "Supergirl get out, she might have Kryptonite."

"Alex, she didn't use it on me before so why would she use it now?"

"Because now you have your body and it can hurt you."

"But she helped me and made me visible."

"She's Lex Luthor's sister!"

Since Supergirl had shown up, Lena had been curious about the idea of a spell which could make things invisible. It would be handy to be able to hide her cottage. She had experimented with the idea of invisibility, then moved on to the idea of moving things to what her book called the Astral Plane. Alternate universes were not a new idea, she had studied the theories at college, and tried crafting a spell to replicate this. She had tried it successfully on a few items, making them vanish, but had yet to work out a way to bring them back.

Lena spoke the words she'd been practicing, causing the agent's gun to disappear. Supergirl and Agent Danvers looked at her in surprise.

"I'm also a witch," she reminded them.

"See! She's powerful, she could help," Supergirl said.

Lena shook her head, "I told you I'm not going to help you."

"Of course she's not," Agent Danvers agreed, "she's a Luthor."

Supergirl placed her hands on her hips, "she's the only one who can help us."

"No I cant," Lena said, at exactly the same time as Agent Danvers said, "no she isn't."

Supergirl turned to the agent, "she made me visible, she can put me back in my body."

"I don't know how to do that," Lena told her.

"You'll figure it out. I believe in you."

Lena looked over at the DEO agent, "is she always this... way?"

The agent tried to keep from smiling, "unfortunately."

"Hey!" Supergirl folded her arms, "if you don't help me then I might just have to stay here and haunt you until you do."

Lena rolled her eyes, "well that's a scary thought. How do you know I won't use magic to keep you out?"

Agent Danvers shook her head, "Miss Luthor, will you please help Supergirl get back into her body?"

Lena looked surprised by the 'please', but she shook her head, "if I try and help, but it goes wrong you'll claim it's because I'm a Luthor. I'll be branded the same as my brother and I'll never get a moments peace..."

"What if we don't tell anyone who you are? What if we promise to keep your secret?" Agent Danvers asked.

"You don't trust me. Why should I trust you?"

"You said it yourself, you could have used magic to keep us out but you didn't. Supergirl wants to trust you, and you're the only one who can help her."

"Way to sell it, Alex," Supergirl muttered.

Lena looked between them, "how far away is her body?"

"National City. It's safe there."

"Well it's better than having a dozen DEO agents traipsing through carrying her here I guess. Fine, I'll go with you, but I need to take a few things."

"Yes!" Supergirl punched the air.

"And you promise that no-one will know who I am?"

"I promise that I won't tell anyone," Agent Danvers agreed.

"Fine," Lena muttered, going to pack a bag.

Lena longed to scratch her itchy nose, but the spell she'd used to hide her true face would only work if she didn't rub off the cream holding the magic. She'd been brought to the DEO, straight to Supergirl's body, where she had spent nearly an hour just going through her book to try and find a spell to tell her exactly what had been done to separate the hero from her body.

"Can't you just say some magic words and make it happen?" Agent Danvers had asked after the first ten minutes.

"Which magic words would you like me to use?" Lena had snapped at her. "This is as much a science as, well... science. The wrong words could make things worse."

After that, Supergirl had suggested Agent Danvers take a break. She sat watching Lena reading, not speaking, which seemed to irritate Lena just as much.

"What did you do to upset someone so much that they'd do this to you?" she finally asked.

"Nothing, I was just protecting innocent people from their magic and trying to stop them..."

"Really? Why did they come to Earth in the first place?"

"It's a long story."

"Hmm... wait! Did you record the battle with them? If I could see their magic being used to do this it might help."

Supergirl shook her head, "sorry, it's one of the few times people were scared enough not to film on their phones. Local CCTV didn't catch her because we were both in the air."

"Well it was just a theory, anyway." Lena looked over at Supergirl's body, "you use the same symbol as Superman."

She lightly traced the symbol on the suit as she spoke, wondering what it was made from.

"It's the symbol for our family, the House of El. Our family motto is 'El mayarah', which means, 'stronger together' and that's the Kryptonian symbol for that phrase," Kara explained.

"Oh."

"Only now, Superman and I are the only ones left."

"I'm sorry," Lena looked up at her, letting her hand fall away.

Kara came over, and looked down at her body, "so, do you think you can help?"

"It'll take time, I've only been using magic for a little while."

"I'll have to ask someone else to brush my hair, Alex keeps parting it on the wrong side."

"Here, let me," Lena smiled and bushed her hand over Supergirl's hair, moving the parting, "is that okay?"

Kara reached out, as if she show her exactly where she liked it, but her hand sank into her head. She looked up at Lena, surprised, as she was pulled completely into her body. Lena held her breath, watching as Supergirl finally opened her eyes.

"You did it!" Supergirl told her, smiling and trying to sit up.

Lena held out a hand to help her, "I didn't use a spell."

"It must be like when I could move things at your cottage, just part of your magic." Supergirl hugged Lena, before she could pull away, "thank you."

"You're welcome," Lena told her.

"Let's go find Alex," Kara hopped down from the bed, and walked straight into the door. "Oh yeah, I can't do that anymore."

"At least you didn't dent it with your super-strength," Lena pointed out.

"Yeah, that took a while to learn."

"I guess i should get going."

"Or you could stay?"

"I told you..."

"I know, but you saved me. I at least owe you lunch. I haven't been able to eat for days, I'm starving."

Lena laughed, "really?"

"Come on, the sooner we find Alex the sooner we can go."

"You seen awfully familiar with a DEO agent," Lena noted.

"Yes."

"I get it, I'm still a Luthor, you want to keep your secrets."

"It's not that..."

Lena shook her head, "never mind. I understand."

"Lena..."

"Look, just keep my name out of whatever reports you write and we're even."

"My name is Kara," Supergirl told her, grabbing her hand as she tried to walk past.

"What?"

"Kara Zor-El, when I lived on Krypton. I go by Kara here too."

"You don't have to..."

"I trust you."

Lena looked at her in surprise. She kept on staring as Kara told her more about herself, wondering whether she was dreaming. There was no way a Superhero would willing provide this information to a Luthor. Still, she wanted to believe it, so she listened and when Kara repeated the invitation to lunch she accepted.

AN: I failed to finish by 31st Oct. I did start writing different ideas for this and the last two days of prompts so there are still some Supercorp stories for me to work on. The other idea for this prompt felt like it was going to be too long so I wrote this instead and can't believe it got to over 2000 words, much longer than I thought.