I have a feeling CW is never going to touch on the things Kara went through in the 100th episode (which I loved, btw), so I decided to do a little extension of the ending. I hope you enjoy!

xxx

Stories I'm already working on:

Kara almost dies (3x09)

Kalex from different points of view

clingy Alex/broken bone

xxx

Kara and Alex waved goodbye to J'onn as he left Kara's apartment. The trio had just finished what they could of Mxy's parting gift and as soon as J'onn closed the door both sisters flopped onto the couch.

"Oh man, I could go a whole year without eating again," Alex mumbled, leaning her head back as far as it could comfortably go.

Kara laughed and rested her head on Alex's shoulder. "Just give me a couple of hours, I'll get hungry again."

Alex smiled fondly and put her chin on top of Kara's head. "I'll forever be jealous of your metabolism."

Kara closed her eyes for a moment, then quickly opened then again when she remembered the things she had seen. In one reality, everyone she loved was dead, even Cat Grant, and in another, she was dead, and Alex had to live with that. The butterfly effect was something that was not to be messed with.

Alex took Kara's silence with great concern. Something had to have gone wrong earlier. "Kar? What made you decide to stay with this reality, even though Lena still doesn't trust you?"

Kara sighed into Alex's neck and snuggled closer. "You'd think this wouldn't the most ideal reality, but it was. I... I watched you talk to my grave... I revealed myself as Supergirl and everyone I loved was killed, so I wondered... What if Lena and I were never friends? ... She killed me... Alex, this just isn't fair..."

Alex pulled back and grabbed Kara by the shoulders after she had finished. "Kara Zor-el Danvers, why did you not tell me any this?! You didn't deserve to go through that alone!"

"But I didn't, Mxy was-"

"He's not your big sister, and he's wronged you before. That's not much of a support system," Alex stated as a matter of factly, almost offended that Kara didn't explain all this before.

"Alex?"

Tears traveled down Alex's cheeks, tears that she hadn't noticed until now. Alex swallowed and cleared her throat. She did not want to be showing this much emotion right now. "You... You watched me talk to your grave?"

Kara nodded and stroked Alex's face a little. "Yeah... It was horrible, I couldn't take it..."

"What did I say?" Alex asked, not sure if she actually wanted to know the answer.

Kara looked her sister in the eyes, noting the sadness and love behind Alex's gaze. "That you were lost without me... Alex, I never want to leave you behind; I don't want to be the reason you feel like that."

Alex was silent for a moment, contemplating on how to react. Eventually, she decided to pull Kara into a tight embrace and hold her like she was never going to let her go, because who knew what would happen next?

Kara clutched to her as tight as she could without hurting her and choked out a sob. "Why does it have to be this way...?"

"Shh, I've got you, you're alright," Alex comforted, rubbing her back and kissing her hair. "Let it out, it's okay, you're safe here."

"The only consistency in all of those realities was that you loved me... Please don't leave me, Alex," Kara begged, burying her face into her shoulder. "I'd be lost without you..."

"I'm here. Always," came the promise Kara wanted.

But Kara knew that was a promise neither could keep, not with the work they did. This wasn't the first time she questioned whether or not Supergirl was worth it or not. "Reign killed Mon-el and Lena in one reality... I heard Lena's heartbeat stop, Alex..." She turned her face into Alex's neck. "There was so much death and destruction and I've never felt so helpless watching it all play out..."

Alex squeezed her eyes shut involuntarily at the thought of having to see any of that happen. "God, Kara, I wish I could've been there for you, that's some heavy stuff. ... How do you do it? How do you continue to have hope?"

"Because what else am I supposed to do? If I don't have hope, what's left for me?"

Kara's answer was honest, but it pained Alex. What else was left? "Me, Mom, J'onn, Winn, even Cat, Kara. We're still here. We don't expect you to be the beacon of light at all times. You're not alone, I'm here for you to talk to whenever you need it. You don't have to be the strong one all the time." Silence met her. Kara just didn't want to talk about hope anymore. "Kara, what do you need right now? I want to support you."

"Just... tell me I made the right decision, letting Lena go. It was one of the hardest things I had to do, but it felt right at the time..."

"Hey, look at me, sis."

Kara lifted her head and did as Alex wanted, even though she knew that the brokenness she felt on the inside now graced her face as well.

Alex held the blonde's face in her hands and smiled comfortingly. "Kara Danvers, you made the tough call, you let your best friend go in hopes that she would come back on her own. And I hope, yes, hope, that everything will turn out okay. I can't promise that everything will turn out the way you want it to, but I will say that you did what was best in your eyes and you should stick with it. Hope, Kara." Alex pointed to Kara's heart. "Don't give up on her. That was too strong of a friendship to throw down the drain."

Kara stared at her for a moment, then nodded once. "Okay... I won't give up."

"Good," Alex whispered before she kissed her forehead. "I don't want you to."

Kara wrapped her arms around her sister again and snuggled close. "I love you, Alex. I don't know where I'd be without you."

"I love you too." Alex leaned into Kara's hair and took a deep breath. "And no matter what happens, Kara, I'll always love you."