Hey everyone, here's the next chapter. Thanks to the person who left this prompt, you gave me two great ideas and I decided to go with this one as I felt like this one would be more fun for me to write. If you have a prompt you'd like to see, feel free leave a comment and let me know.

Also thanks for all the kind reviews, it means a lot.

Prompt: what if Supergirl couldn't stop the Cadmus ship from leaving Earth? Alex and Kara reuniting after Alex navigates the ship back

Supergirl had given it everything that she had to stop the ship, she had tried with every ounce of her being to save Alex.

But she had failed to stop it, and when the ship exhilarated, Kara wasn't able to hold on at the high speeds.

Within seconds the ship was gone, and Alex with it.

Once it was so far away, communication was lost.

Kara had no idea how to get her sister back.

The DEO was currently preparing a team to search for her that Kara would be leading, but space-ships were on short supply and they weren't even sure where Alex was.

It had been 2 weeks.

Every day, Supergirl stayed at the DEO, sleeping in her sister's lab when she wasn't working with the team to find a way to reach Alex.

She had been to her apartment once to get the things she needed, but other than that she stayed and worked.

She stayed through long days and even longer nights, sometimes the only one still working, except for J'onn.

He always stayed and helped and tried to get Kara to rest properly, but Kara had told him numerous times she would only rest was when her sister was back.

And so J'onn stayed with her and together they tried to find a way to get Alex back.

3 weeks went by, and Kara was trying to ignore the feeling that they weren't ever going to find her.

What if they never found a way to track her, or what if by the time they reached her she was already dead?

When those thoughts came, Kara pushed them aside and forced herself work harder, she had to find a way, she had to get Alex back, no matter what.

27 days since she had lost her sister, Kara sat at the computer in her sister's lab, her eyes growing heavy as she tried to stay awake and keep working on her project, she felt like she was getting close.

Still sleep begged to come, and she honestly couldn't remember the last time she had slept, she wasn't even sure what day it was.

She had taken a temporary leave from CatCo so she could fully focus on finding Alex, and so she spent little time outside of the DEO except for Supergirl emergencies.

A knock on the door jumped her back awake.

Turning to see the source of the noise she saw J'onn walking in with his usual cup of coffee for her.

She gulped down the contents, ignoring how it made her empty stomach hurt, had she eaten today? She wasn't really sure.

J'onn came to sit down next to her, slowly sipping on his own cup as he began his work.

"Supergirl," He said, pulling Kara's attention away from her computer screen.

"I know we need to find Alex, and we will, but our best chance of doing that is when you're fully functional, and that's not what you are right now."

Kara rolled her eyes and looked back at her computer, J'onn had been saying this to her for 3 weeks, and Kara was sick of the nagging.

"I'm fine, besides we don't have time to talk about this. I think I'm making some progress finding a way to reach her, I thought of this thing, well more like I found this thing-"

"Kara" J'onn cut it, "Alex is going to be ok, you know that right? She's a fighter and so are you, and we'll find her." He said, knowing Kara's rambling was a mask to cover her doubts.

She took a shaky breath, "Will we? It's almost been a month; I can't help but feel like we're getting nowhere. I can't… I can't do this without her." she said, voice breaking as she looked down to avoid J'onn's gaze.

"I can't be Supergirl without her, I can't be Kara without her. If I had just- just been stronger, held on tighter, I could've saved her. But I didn't and she's gone and it's all my fault, it's my fault!" She said, slamming the coffee cup she had been holding down and watching as it shattered in her hands.

J'onn slowly stretched his hand out, reaching for Kara's and holding her hand between his own as he gave her a minute to collect herself.

Her breath was shaky and quick, like she was trying not to cry (which she was), and her head was turned away, but still she allowed him to hold her hand and slowly she met his gaze.

"It is not your fault. That voice that's telling you that is guilt over something you have no right to be guilty over. You did everything you could and you're giving it everything you have and more to find her. Don't blame yourself-"

Suddenly a beep interrupted his speech.

Both turned to look as an alert filled the computer screens.

"A ship is headed to the desert." J'onn said as he watched the monitor.

"Is that… is that the Cadmus ship?" Kara asked as she stood over his shoulder.

J'onn nodded.

"Let's go."

As they flew there, J'onn contacted the other DEO agents and told them to get there as soon as possible since no one knew who was actually on the ship.

When J'onn and Kara approached the place where this ship was supposed to land, they both knew immediately it wasn't going to be much of a landing.

It was moving far too fast for it to touch down safely.

Kara flew faster to meet the ship in the air, she didn't know if Alex was on it or not, but there was a chance she was, and Kara was not going to let her crash into the ground.

She flew to the front, like she had done all those days ago, and started pushing against the frame of the aircraft, trying to slow it down.

It was moving so fast and Kara felt like she was hardly making a difference in the speed, but she kept pushing.

J'onn was beside her, both of their hands leaving dents in the places they pressed.

Still the ship continued to fall quickly, the ground getting closer.

Then Kara saw her, inside the ship and buckled into one of the seats sat Alex, watching them and giving commands to the other people inside as they all neared the surface of the earth.

Once again Kara was reminded of that night, when she was here and Alex was there and Kara wasn't able to save her.

Not again.

Kara pushed harder, her arms felt like rubber and her vision had black dots swimming in it.

Still she pushed harder.

The ship was slowing, but Kara knew there was no way they could stop it before it hit the ground, but they didn't need to, just slow it enough so Alex could pilot it down safely.

They only had seconds now, and Kara looked back at Alex, hoping her sister would understand what she needed to do.

They had been able to communicate without talking for years.

Little looks and eyebrow raises and smiles that spoke sentences between them.

But right now it was it chaotic, after all they were all plummeting to the ground at unnatural speeds.

Besides, the sisters hadn't been around each other for weeks, they were rusty with each other's company.

So Kara worried as she looked, still pressing hard against the frame of the ship, that Alex wouldn't know what the look meant.

But Alex knew.

Alex stumbled towards the controls and began moving knobs and levers. Kara felt the ship begin to pull up and level out, and she helped the motion as best as she could.

Beside her, J'onn saw what they were doing and begin pushing the ship accordingly.

Within seconds it was no longer head-on facing the ground, but instead horizonal, landing gears beginning to come out as Alex pushed the appropriate buttons.

It was still moving fast, and the landing was rough, but it landed nonetheless.

Kara dropped to the ground, breathing harshly as she looked at J'onn.

He stood next to her as he caught his own breath.

"Good job Supergirl." He said, patting her shoulder as he regained his composure.

"You too." She responded.

Kara flew back up to look through the window, desperate to finally be with Alex again.

However, when she looked inside, she saw the room was empty.

At the same time, she heard noises come from the side of the ship and saw the exits were open, Daxamites filling out into the area.

In a second, she was at the door, scanning through the people to see her sister.

"Kara!" said a voice through the crowd, Kara looked the her right to Alex walking out of the exit.

They both made eye contact and ran to meet one another.

When they collided, it was like that moment when you put both sides of a PP&J sandwich together and it just feels natural, it fits just right.

It was as if a part of each of them had been lost with the other and when they touched that piece returned, making them complete.

For several minutes the sisters stayed in each other's grasp, holding on to each other like their lives depended on it.

"I- I'm sorry but I can't breathe Kara." Alex said with a watery laugh as she pried her sister's arms off of her.

"Oh right sorry, sorry." Kara said as she released her grasp, she didn't even realize how hard she had been holding.

"I just missed you so much." Kara said as she tried to stop the flood of tears that came.

Alex reached forward and pulled her into another hug, "I really missed you too." She said, voice shaking with emotion.

"What happened?" Kara asked, "How did you get back?"

"It's a long story, but I was able to take control of the ship and we never reached our destination. We've been flying around trying to find our way back here this whole time." Alex said.

J'onn came up behind them and Kara released her grip so he could give Alex a hug.

"It's good to have you back." He said.

"It's good to be back." Alex responded.

"Thanks to both of you," she said as they pulled apart, "There was no way we would've survived that if you two didn't slow us down."

"Why did you try to land if you didn't think you could make it?" Kara asked, locking arms with Alex as the three of them made their way away from the crowd of people.

The other agents had arrived and were dealing with the Daxamites.

"Well when I said I got control of the ship, I mean I kinda had control. I only had one chance to come down into Earth's atmosphere before we were sent hurtling out of the solar system, so I took it. Besides I knew you guys would come. I knew you'd come." Alex said, locking eyes with her sister.

"So what happened to you Kar?" Alex asked as they gained some distance from the crowd and came to a stop.

"What do you mean?" Kara responded, genuinely confused.

"You look terrible!" Alex said with a gesture to Kara.

It was true, Kara had lost several pounds since she'd last seen her sister, and dark shadows covered the skin beneath her eyes. Her eyes themselves were bloodshot from lack of sleep and her skin was paler from so much time spent inside.

J'onn answered for Kara, ignoring the look she gave him.

"Kara has neglected her own health in her attempts to get you back, and just wait until you see what she's done to your lab."

Alex's eyes caught her sister's, "Kara really? I've been gone for what 4 weeks and you can't even remember to eat?" she said jokingly, knowing they would have a more serious conversation about this later.

But deep down that she couldn't really blame Kara for her response even though she didn't approve.

After all Alex was pretty sure she would've become just as bad if not worse if the roles were reversed and Kara had been missing.

Kara gave her a weak smile, her face looking more alive than it had in weeks.

Alex smiled back, gently running her hand through her sister's hair.

Oh how both girls had missed the familiar touch of the other.

"You two get back home, I'll take care of things here." J'onn said, knowing they both deserved some time to catch up.

Alex and Kara gave him appreciative smiles as he walked away.

"You wanna fly?" Kara asked, holding her hand out for her sister to hold.

"I just was." Alex responded with a grin, taking her sister's hand as Kara pulled her into her firm but comfortable grip.

"Yeah well that wasn't really flying, that was more of controlled falling."

Kara heard her sister's gentle laugh as they took off, and she could've sworn it was the best sound she'd ever heard.

I hope you all enjoyed it, and if you have a request let me know. Hope you all have a great day/night!