This is my first SnowBarry fic, and I'm really hoping it goes well. It'll be in about three parts and will revolve around Caitlin getting powers. In the comics, Caitlin Snow becomes Killer Frost, a Flash villain. Now whether that will happen or not is still unknown, but we're all hoping for the best, right?

Thanks to Caitlin51 for inspiring me to try this out with her SnowBarry stories. They're all compiled together in 'Say Something'-which I highly recommend reading.

Part 1

"Barry!" Caitlin shouted, slamming her hands against the glass of the control box Dr. Wells had locked her in. "He's starting the particle accelerator!"

Barry shot over to the box from the other side of the room in an instant. She watched as he looked for a handle to open the door, but there was none. The door could only be opened by a switch on a remote that would automatically lock the room if broken. It now was since Dr. Wells had stepped on it. Caitlin wished that she had never come down in the first place and discovered his secrets. That he could walk, that he was fast like Barry, that he was building another particle accelerator to recreate the lightning bolt that hit Barry to strike him and enhance his speed. Right now, Dr. Wells was gone, but she knew he would be back soon. And Barry couldn't be there when he did.

"Caitlin, I'm going to try to break the glass," Barry said, preparing to run back.

"You can't break it, Barry!" Caitlin cried in protest. "You need to get out of here. If you break the glass, Dr. Wells will come up here. Barry, he's…"

"I know, I found out a few moments ago" His voice sounded broken. "Why couldn't you have waited for me, Caitlin? Why did you have to come down here on your own?"

Caitlin walked up to the glass, trying not to cry. She opened her mouth, but she couldn't find words.

"Caitlin-"

"Because I didn't want you to get hurt again!" she shouted. "It's because of me and the rest of STAR Labs that the first particle accelerator exploded and you got fast and there were metahumans running around. I helped start this, and now I wanted to end it."

"What happened to me that night was not your fault!" Barry yelled back at her. "There's got to be some way to get you out."

"I've looked there's nothing. You need to run though, Barry. I don't know how the energy release from this particle accelerator will affect you this time," Caitlin told him, struggling to hold back her tears. "I can't let anything happen to you. Central City needs you, not me."

"But I need you," Barry's voice cracked a little. "Caitlin, I love you."

She closed her eyes and rested her head against the glass. The tears were now running down her cheeks and probably smearing her make-up, but Caitlin didn't care. For so long, she'd been holding onto Ronnie. Just when she finally let him go, finally moved on, the gate was slammed shut on her happy ending.

"I love you too," she choked out, sniffling. "But you have to leave me."

"Caitlin…"

She opened her eyes to see Barry's forehead pressed against the glass, looking utterly heartbroken. His big puppy-dog eye, just pleading her to let him help.

"No, just leave me," she said as firmly as she could. "This is my choice, Barry. I'd rather die than see you get hurt anymore. Please, just get as far away from here as you can."

Barry stepped back from the glass, gazing at her. Caitlin wiped her eyes and nodded. "Run, Barry," she murmured. "Run."

There was a whoosh of air and a blur of red, and then Barry was gone. Caitlin sank to the floor inside the box, counting the seconds in her head.

The tears came back at seven seconds.

Dr. Wells reentered the room at ten seconds.

She heard the boom at eleven seconds, and blacked out at twelve.

I'm hoping to get part 2 up soon. I hope you all enjoyed the beginning of this, and I'm sorry for the feels. Sort of. You're meant to have them.

Please review!