I couldn't help but think while watching the third season of The Flash that someone other than Caitlin should have been making her medical decisions while she was Killer Frost. Of course she isn't going to take a cure while she's rage ice blasting. Someone just needed to jab her with it and be done with it. Her powers are really useful though, so she should get to keep her powers and not go crazy. And Julian can stay around because AU fanfic doesn't require Tom Felton's filming availability.

Chapter 1

"Caitlin, wait," Julian begged, standing between her and Cisco, who had just been knocked to the ground by her ice blast.

"Caitlin is dead," she hissed, raising her hands, ready to strike. Her eyes were icy blue with rage.

"It doesn't matter. Caitlin. Killer Frost. Whatever you call yourself, whoever you are becoming, I still love you. Nothing you can do will change that," Julian said, trying to get through to her.

She sneered at him and stepped closer. "You won't love me when I kill your little friends. You won't love me when I freeze your limbs off after you watch me kill them."

"Then I guess that's what you'll do then. If that's what I need to sacrifice to be with you, then I will. Better yet, I'll sell my soul to the devil. I'll put the Alchemy garb back on and I'll join you and Savitar. Because you're the only one who matters to me," he took a step towards her, close enough to feel her cold breath on his face.

"Julian, no!" Cisco yelled.

She hesitated. "You'd accept me? Betray your friends for me? Join me?"

"I love you. No matter what," he said, tears threatening to escape. "I know you love me too."

"Julian…" she said, confused. Her eyes briefly flickered back to brown.

"I'm not afraid. Tell me we can be together. Tell me, my love," Julian said, reaching for her.

"Julian," she whispered, tears freezing on her cheeks.

In the moment she blinked them away, her eyes turning brown, that's when he acted. He stabbed her in the chest with the loaded syringe, the cure for Killer Frost.

"I love you, Caitlin," he murmured into her neck, the cold of her skin burning him.

She gasped for breath as she collapsed in his arms, her hair slowly turning brown and her skin warming.

He scooped her up into his arms and carried her back to his car, a battered, bruised and angry Cisco not far behind him.

"You… you didn't give her a choice. Either when you let her become Killer Frost, or just now by giving her the serum," Cisco fumed. "Who the hell are you to keep making her decisions for her?"

"Her medical surrogate," he said, quietly. "She signed it when we started looking for a cure, in case anything went wrong during an experimental treatment. She trusted me to make the hard choices, even when they went against her own. She knew she might not be able to decide herself."

Cisco exhaled. "I'm sorry. I didn't mean to blow up at you. It was a crazy risk you took, bro," Cisco said. "I don't know that I can argue with the outcome though, can I?"

He nodded. "Cheers, mate."

"Julian…" she murmured, as he fastened her seat belt.

"Shh… rest, my darling. Everything will be okay now."

Back at STAR Labs, Julian stood vigil over her in her bed, refusing to leave, or sleep himself, until she regained consciousness.

"Did you really mean it?" she whispered, her eyes fluttering open for a moment.

"Which part? The part where I love you and want to be with you no matter what you'd become? The part where I'd follow you into Hell? Yeah. I did. But I wasn't going to give up on you either. I'd do anything for you, Caitlin," he said, stroking her soft, brown hair.

"I love you, too," she smiled before drifting back off to sleep.