So I got this story in my head for an eternity but finally decided to write it now. Its a Casey and Severide story with no Dawson in it.

This story loosely leans onto the Season 2 finale.

You have to know that English isn't my first language but I am trying hard. Hope you will like it.

Chapter 1 - Darkness

The explosion that went through the building caused Casey's body to fly through the air like a little doll. His body collided hard with something and right in this second everything went black.

"Anyone hurt?" Severide was the first to shout out for his team glad as he recognized there was no alarm filling the air. So nobody was down. Slowly everyone confirmed to his question, everyone but Casey.
"Casey you good?" Severide asked into his radio, just to hear Casey's voice in his ear seconds later.
"I..." Casey stopped, taking in a shaky breath before speaking up again.
"Kelly, I...I can't see." He mumbled getting Kelly to widen his eyes.
"What? Where are you?"

"I don't know. Last thing I know I was on the second floor and then my body flew through the air. It's pitch black...I can't...I can't see."
"Okay buddy stay calm okay? I am sure you are going to be okay.", Kelly tried to reassure his friend, turning towards Hermann, who had widened his eyes too.
"Maybe he is trapped..." Hermann tried his best to find a good logic behind Casey's words.

"Let's move. We have to find Casey." Kelly said, not paying attention to Hermann. Adrenaline, shock, and pure angst where rushing through his body. He needed to find Casey. He needed to make sure that he was alright.

It didn't take Severide long to get sight of his best friend. Casey was leaning against a wall, his eyes starring blankly at a spot right in front of him.
"Hey Casey!" Severide called out for his best friend and watched as Casey's head shot up, his eyes not meeting Severide.
"I am here!" Casey called out getting Severide froze in his spot.

"I can't see" Casey's words echoed through his head.

"Hey man what happened?", Severide asked, as he got near Casey, his touch getting the other Lieutenant to jump.
"It's me. It's Severide." "
"Sev, I can't see you." Matt said pure panic filling his voice. He grabbed Kelly's jacket as if his life depended on it. Kelly looked straight into Matt's unfocused eyes.

"I know. We will figure that out okay? Come on, let's get you out of here." Kelly tried his best to sound as calm as possible.

"Is everyone else okay?"

"Yes. They are all okay." Kelly promised, guiding his best friend to his right site, while placing an arm around his waist. Matt placed his arm around Kelly's shoulder in return.

"I will get you out of here." Kelly promised moving forward slowly. Hermann got to Casey's other side as he could see how afraid Casey was to actually move and make a step forward.

"It's Hermann. Come on, lay your arm around my shoulder." Hermann said, feeling the fear as Casey grabbed onto him. He could only imagine how his Lieutenant was feeling right now.

Casey tripped a few times but Severide and Hermann kept him upright. As they finally reached the outside Casey didn't notice the change of surroundings.

"Casey? You okay?" Shay's voice reached his ears before he could feel a hand on his arm. It had to be Shay's.

"He can't see. He lost all his sight." Kelly explained quickly watching the shock in Shay's face. She was displaying everything he was feeling too.
"Alright Casey. We will get you to Lakeshore now. They will make sure you get better okay?" Shay said, but Kelly could feel that Casey was refusing to let go off him.

"I will go with you." Severide said getting a nod from Boden.

"Okay, big step up to the ambulance." Shay explained before leading Casey to the gurney.

"I will check your vitals during the right, okay? You just try to relax as good as possible." Shay said, before getting into her normal routine.

At Lakeshore Matt was rushed into a trauma room immediately while the doctor asked Kelly to wait outside.

"No please. Can he please stay? Kelly would you stay?" Matt ask in panic. Kelly could only imagine who vulnerable Casey's situation was right now.

"Of course I will." Kelly said walking into the room again. "I am standing right at your feet." Kelly said, laying a hand on Casey's leg so his friend could at least feel him.

"Alright. Lieutenant Casey, what happened before you got blind?" The doctor said, getting Kelly to swallow hard on his words.

The examination of Casey's head and what felt like his whole body took hours, nonetheless Kelly was by his side every step of the way, always making sure to touch Casey as he knew that his friend felt much more safe then.

The nurse had inserted some eyedrops into Matt's eyes before she had put some thick gauze onto it, bandaging his eyes.

"Any news yet?" Kelly asked.

"The eyedrops prevent the eyes from getting too dry as Mr. Casey is not blinking normally at the moment. I am sure the doctor will stop by soon." The nurse explained before leaving the room, giving Kelly and Matt their first seconds of privacy since the explosion.
"How are you holding up?"

"No that I have a bandage around my head I can tell myself that it's just that blocking my sight."

"I am sure you will be okay."

"Yeah? Because I am not."

"I am here for you okay. We will fight this together."

"I know. Thank you Kelly."

"You would do the same for me."

"I would."

As the door opened again Kelly told Matt that it's the doctor immediately.
"That's right I am." Dr. Herold answered positioning himself on Casey's left site.

"As you know we made a lot of scans to make sure the loose of your sight has nothing to do with your previous head trauma. We can't quite confirm that."

"Please tell me that it's not permanent." Casey begged the doctor, not prepared to get an answer.
"Well,there's a moderate concussion with some fleeting blindness. It's most likely due to small floating blood clots in the vessels around the eyes,demonstrating a C.V.I. or cortical visual impairment. "

"How long will his vision be affected?" Kelly asked, letting the information's sink in.
"Well, it's hard to say, really. The body's healing powers are unpredictable, but 72, more likely 96 hours is the normal. We must wait and see, so to speak. We think it's temporary" The doctor explained.
„You think?" Casey asked with an alarmed voice.
„It's a pretty rare condition you are suffering and we always have to look at it in combination with your previous head trauma so we can't be 100 percent sure and we will have to wait 72 till 96 hours and see if the vision comes back."
„And if it's not back by then I will stay blind?" Casey's voice was shaking now.
"If it's not back by then we will defiantly run some more tests."

"Does he have to stay in the hospital during the next 4 days?" Severide asked, knowing how much Casey hated hospitals. And in his situation Kelly was sure that he hated them even more.

"We want to monitor him during the night due to the concussion but you can take him home tomorrow morning. "

"I think I will ask them to stay here until my sight is back." Casey said after a while of silence. They hadn't talked after the doctor had left, needing to let the information's sink in.

"Don't be stupid. You hate hospitals."
"But what am I supposed to do? I can't go home like this."
"I will help you. As I said we will get through this together."

"You have to work and..."

"Boden can handle a shift without me. Hermann is covering up for you and he can get a replacement for me. That's not a problem and you know that." Kelly cut him off.
"I don't want you to babysit me."

"But I will because you need me right now and that's what friends are for right? I am pretty sure if you don't agree to this Hermann will force you to move in with him, Cindy and the kids during your recovery."

Casey laughed out searching for his friends hand that was laying on his arm.

"Thank you."
"You can get me out to a game once your sight is back." Kelly answered glad his friend couldn't see the fear in his eyes. What if Casey's sight wouldn't return during the next 72 to 96 hours?