Hey guys! This is set after s3ep13 (where the second Worldkiller, Purity, is introduced). I do not own Supergirl or any of the characters. This fic is #AgentReign. Enjoy! And feel free to leave a review, your thoughts mean the world to me :)

Alex leaned against the doorframe of her apartment's guest bedroom.

She watched Sam tuck a loose strand of hair behind her ear as she pulled the blanket up to Ruby's chin and kissed her forehead.

"How is she?" Alex asked once Sam had closed the door behind her.

Sam sighed and rubbed her temples. "As good as she could be, I guess, considering all the shit that's been going on."

Alex looked at her with concern in her eyes. "You should get some sleep."

Sam scoffed. "I know I should. It's a matter of if I can."

Alex reached out and pulled her into a hug. Sam's body tensed at first but relaxed as Alex moved her hand in small circles on her back. "It's going to be okay."

It had been a difficult week for everyone. After discovering that Sam was, in fact, Reign, she had been locked up in a cell at the DEO. This was done at Sam's own request. However, when Kara and Alex tried to communicate with Sam, they soon discovered that once any Worldkiller was locked up they became unable to transform back into their original self. Reign remained Reign. She was sedated and taken out of the cell. Against Sam's protests, Kara had said that it was far safer for everyone if Sam remained in a comfortable and familiar environment. Surprisingly, J'onn had agreed.

So here they were.

Sam had reluctantly moved in and Alex had told her she could stay as long she needed.

"You shouldn't be alone tonight," Alex said, watching as Sam walked to the pull-out couch.

"I'm fine, Alex. Really." She smiled but Alex could see that it was forced.

"If you say so." Alex contemplated trying to further persuade her but decided against it. "Goodnight, Sam."

"Goodnight, Alex."

Alex laid awake for hours, staring at the ceiling and listening through the thin walls as Sam shifted in her bed again and again until it was finally silent.

Alex woke to the sound of muffled sobbing. She rubbed her eyes and sat up, squinting into the darkness. Then her eyes widened. Sam.

She threw the blanket from her bed and ran to the living room, her footsteps loud in the heavy quiet of the night.

Sam was curled up with her knees to her chest in the corner of the room, shaking. Her arms were wrapped tightly around a pillow, knuckles white with tension. Tears were streaming down her face.

"Sam," Alex ran to her and dropped to her side. "Sam, it's me."

Sam looked up from her pillow, fear racing through her eyes. She took a shaky breath and tried to speak but her speech was garbled and incoherent. She began breathing faster.

Alex slid her arms around her. "Hey," she whispered, "hey, it's okay. Don't talk yet. We can talk later, okay?" She pulled Sam closer. "I'm not going anywhere."

Sam seemed to understand. They stayed in that position for a long time until Alex felt Sam's breath slowing. Without thinking, she kissed the top of Sam's head. "I told you we should've slept together, dummy." Alex reddened and fumbled for the right words. "Um, not together like that, just, you should have slept in my bed. I mean-"

She was cut off when she hear Sam snort. She wiped her nose and looked up at Alex. "You're such a dork," she said, almost smiling.

Alex scratched the back of her head. "Yeah, I get that a lot." She sighed. "Come on, we can sleep in my room." She winced. "Separately, I mean."

Sam shakily smiled. A real one this time. "Yeah."

They got up and Alex kept one arm around Sam's shoulders as they walked to her room.