This story starts off during the events of "One Crazy Shift" but branches off into its own thing after that. In this world, Casey and Dawson were married but divorced as they did in the show. Severide was never with Kidd though. Definite Sevasey to start and more to come! Hope you enjoy :)

Severide blew out a cloud of hot air as he stared at the woman in front of him, frustrated by her lack of help with the situation. Laundromats were going up like kindling all across Chicago and this lady, Marcy she had said, did not want to seem to listen to anything he or Casey were saying. But he knew that they had to keep trying. If they didn't stop the laundry soap from being shipped out, people could die. And Severide was not going to let them happen on his watch.

He watched as Marcy eyed him warily, taking in his demeanor before she let out a quiet sigh of her own. "Listen, I will call my supplier and see what they have to say, but after that, there's not much I can do. I could lose my job already for how delayed this truck is."

Severide huffed out a laugh. Classic corporate mindset. They don't care about anything but money. "Great. You do that and we'll stand here for as long as it takes to get an answer."

She sent him a glare at his tone but turned away to make the phone call. Satisfied for the moment, Severide turned and realized that Casey was no longer standing next to him, but was facing with his back toward him a few feet behind him. Concern began to rise in Severide's chest at the man's hunched posture, his gut telling him something was going on.

Walking over, he noticed that Casey was grimacing as he grabbed at his head.

"You okay?" he asked softly, wanting to know what was going on with his boyfriend. Something had been awry with Casey ever since he took a header on that call the other day.

Casey whipped around at the question, clearly regretting the movement as he winced in pain again, staggering slightly where he stood.

"Woah, easy Casey," he soothed, grabbing onto his left arm to steady him. "What's going on?"

Casey blinked a few times before looking at him. The first thing Severide noticed was how large his pupils were and the next was how pale his friend had gotten. It was like all of the blood had drained out of his face at once.

Casey finally moved to respond, his lips starting to form a word when his eyes rolled up in his head and he collapsed. Luckily, Severide still had a hand on his arm.

Moving quickly, he clumsily lowered Casey onto the ground so he wouldn't hit his head again.

"Casey!" he called, checking to make sure that the blonde was breathing. "Casey, can you hear me? You gotta wake up."

Grabbing the fallen man's wrist, Severide felt for a pulse. Relief washed through him as he found a steady beat. Casey had just passed out. And while that still caused his heart to beat wildly out of his chest, he could at least rule out something life-threatening.

"Oh my god, is he dead?" Severide winced at the shrillness of the voice. Marcy had clearly finished her call and was now crowding Severide as he tried to figure out what was going on with Casey. "I'm calling 911!"

Severide quickly turned to look at her. "No! Don't call 911, just give me a second here. I'm medically trained." Every firefighter was required to go through basic medical training, but Severide always made sure he was more qualified than the rest as a lieutenant of his Squad. He always wanted to make sure he could take care of his guys. Plus he knew Casey would kill him if he called an ambulance and he wasn't dying.

Turning back to Casey, he saw that some of the colour was beginning to return to his cheeks. Severide took this opportunity to try and rouse him, rubbing his knuckles over Casey's sternum to try and wake him up.

"Come on Case, you gotta come back to me! You're starting to freak me out."

Suddenly Casey let out a weak groan, scrunching his face as he finally came to.

"Hey, hey, you with me, Case?"

He watched as Casey opened his eyes, blinking rapidly at the sun streaming overhead. "Wha- What happened?" he whispered, looking around in confusion.

"Here let me help you sit up first. The ground is freezing." Gently pulling Casey into a sitting position, Severide helped maneuver him so that his back was resting on the wall of the building.

"You doing okay?" Severide asked, searching Casey's face for any sign that he was going to pass out again. What he really wanted to do was grab his hand and hold him tight, telling him to never scare him like that again. But his and Casey's relationship was one that they kept out of the public eye. They hadn't even told anyone at the firehouse. For all they knew, they were both straight. The two of them had only been together a year, as Casey's divorce with Dawson had really taken a toll on his love life. They hadn't even meant to get together, but after moving in when Casey's apartment had burned down, they had found themselves spending all their free time together and things had escalated from there.

Now, they were both the happiest they had ever been. Severide had never loved anyone like he did Casey. So seeing him collapse all of a sudden had made his heart drop. The only thing that kept him calm was his years as a first responder. You got used to situations like that, letting your instincts take control instead of your emotions.

Casey seemed to understand what was currently going through Severide's head. He gently grabbed his hand out of sight of the woman, giving it a gentle squeeze. "I'm okay Sev."

Severide frowned, not trusting that answer. "If you're so fine, why did you pass out then?"

"Must have been the fumes from that soap. It was giving me a headache," he spoke honestly enough that Severide let it drop, knowing that he would be on his case if it happened again.

"Okay then, I believe you. Think you can stand up? You're scaring our not-so-helpful friend over there." Severide motioned to the lady standing behind them, hovering over them with his phone clutched in her right hand.

Casey nodded, releasing a somewhat shaky breath. "I'm good. Just help me up."

Reaching down, Severide gripped Casey's right arm and slowly pulled him to his feet, keeping a trained eye on him in case he fell again. But Casey held strong, not letting himself waver at all as he adjusted his hat on his head.

"See? I'm alright. Those fumes just overpowered me for a moment."

Still feeling like there was more to the story, Severide could see that Casey wasn't going to speak any further on the subject, so he let it go. Focusing himself on the task at hand, he let the firefighter in him take over and pushed aside the concerned boyfriend part of him for now. He met Marcy's eyes with a new determination, not wanting to drag this matter out any further.

"Have you finally decided to help us or do I have to commandeer this truck myself?"