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Alex Danvers hated it when she and Kara fought. They didn't do it often, and usually it was over by dinner time. This time though, Kara was really pissed at her. They hadn't spoken in two days and people were starting to question her about it, particularly J'onn and Maggie. She'd dodged J'onn and was able to leave work but home was a different story. Maggie was coming over and they were finally in a good place so there was no escape in her regular fortress of solitude.

(Flashback)

She'd wanted a sibling for as long as she could remember. She'd asked every Christmas and birthday, even when she was four years old and had read in one of her mom's books about where babies came from. Her parents told her then that they couldn't have any more children so instead she asked for them to adopt but they kept telling her drop it; eventually, Alex did.

Then, one day when she was fourteen, Superman, Kal-El, stopped by with a girl a bit younger than herself. The girl's name was Kara, Kara Zor-El. Her parents brought the girl inside and explained that from now on, if anyone were to ask, Kara was Alex's new sister.

They spent ages going over basic Earth culture. They watched every movie, listened to every cassette, did anything and everything so that Kara appeared to fit in. One evening it was pouring rain and thundering. Kara had hated thunder ever since she'd landed on earth, the booming noise reminded her of Krypton's exploding as her pod zoomed away. To help distract her sister, Alex put in a movie she'd been avoiding, Practical Magic.

Forgoing the popcorn because the sound scared Kara, Alex poured them both a Coke and grabbed the pizza they'd ordered earlier. She put the movie on and once she was settled, waited for Kara to curl up next to her. Kara reacted well to the opening scenes considering some of the parallels between herself and the sisters. When they got to the part where Gillian and Sally made themselves a pact with blood, Kara quickly turned to her in surprise.

"Alex, can they really do that? Does it make them real sisters?"

"No Kara. It's more like a promise to always be there for each other, no matter what."

"Oh. Okay."

Kara looked dejected and Alex couldn't bear to see the look on her sister's face. So, she pulled her closer and told her to settle down and finish the movie. When it was over, Alex turned to Kara and muted the television. Eliza and Jeremiah were still out at work so there was nothing else to interrupt them.

"Kara? Do you still want to make a pact?"

Kara glanced up at Alex quickly. In surprise? In gratitude? Either way, Kara nodded her head and held out her hand when Alex pulled out the pocket knife Eliza and Jeremiah didn't know she had. Since there was no way they'd be able to draw blood on Kara's skin, they had to improvise.

"Hey Kara?"

"Yes Alex?"

"What do you know about Krypton's red sun?"

The two gathered everything they could from their parent's home laboratory and Alex's personal chemistry set to try to mimic Krypton's red sun. Eventually, somehow, they succeeded on a minuscule level. It was barely enough to let the knife penetrate Lara's skin, but it was enough.

Alex poised the knife and cut both hers and Kara's palms. They pressed them to each other's repeating the phrase, "your blood, my blood, our blood."

Hugging, Alex kissed Kara's forehead as they pulled apart. "There, now no matter what we'll always be sisters."

(Present)

"That's why you have the scar on your palm," Maggie asked as she gently traced the scar with her finger. They were curled up on the couch, surrounded by blankets, a few beer bottles, and a pizza Maggie had brought with her.

"Yeah. Even Kara's hand scarred. We never talk about it, but it's always in the back of my mind. After we thought my dad died, we were all each other had. My mom had always been hard on me but it had gotten worse. Eventually I came to rely on myself and myself only. My purpose was, is to protect Kara and to remind myself of that I look at the scar."

"Danvers, I love the way you are with Kara. I love your relationship. I wish I could have that but Alex, you have to protect yourself too. That's why Kara's so angry. She knows you tend to make reckless decisions when she's involved. When it comes down to you or Kara you always choose Kara and quite frankly, it scares the crap out of both of us. We can't lose you Alex."

"She's right you know," Kara said as she flew through the open window.

"I'll let you guys talk-"

"No, it's okay Maggie. Stay." Kara moved to sit on her sister's other side so that the elder Danvers was between herself and Maggie, so that she could see that she was supported on both sides. "Alex, you mean a lot to us. To both of us. Maggie's right, you need to look out for yourself too. I'll be okay without you trying to take a bullet for me or something, I'm freaking bulletproof."

"I know I know. And I'm sorry okay it's just, you're my sister, my family. I know I can count on you no matter what but you're already saving the city on a regular basis on top of your job at CatCo. You shouldn't have to bear my burden as well."

"Alex Danvers don't you ever think that you're a burden to me! Do you hear me? You are the best most amazing butt kicking sister a girl could ask for. Don't ever forget that okay?" Alex stayed quiet. "I said okay?"

"Yeah, okay. Does this mean you're not mad anymore?"

"Yeah, it does. And I hope you don't mind but I'm crashing your evening with your girlfriend."

"Not my girlfriend!" Alex and Maggie said together. They glanced over at each other and smiled.

"Yeah whatever, turn on the tv I'm getting the ice cream."