Summary: While on shift at the firehouse, a severe migraine hits you hard—accompanied by the dreaded aura and vomiting. Matt and Kelly know exactly how to help, offering support and reassurance when you need it most. Though you insist you’re fine, they refuse to let you push through the pain alone, guiding you through the worst of it and making sure you rest.
Warnings: mentions of vomiting, nausea, needles and injections
It started as a dull throb behind your eyes, a familiar feeling that you tried to ignore. You had learned to push through migraines on shift before—after all, being at the firehouse was no place to show weakness. But today, the pain crept in faster than usual, quickly escalating into something unbearable.
The flashing lights and the sounds of the firehouse faded into the background as your vision started to distort. It was a warning sign that you knew all too well: the aura. Your hands shook as you tried to keep your composure, but it was becoming increasingly difficult. Each throb in your skull felt like an electric pulse, and the nausea was a relentless wave that threatened to overwhelm you.
You staggered to the back of the station, hoping to escape to a quieter area. But as you walked, the world around you spun—spinning faster than you could control. Panic crept in as you fought to steady yourself, but it was a losing battle. You could feel the sweat on your skin, the tightness in your chest. Then came the dreaded sensation of vomiting—your stomach turning in knots before you finally doubled over.
“Y/N!” The voice that broke through the haze was Kelly’s, followed by the sound of Matt’s heavy boots pounding toward you.
You managed to look up just as they reached you, concern written across both of their faces. Kelly was the first to reach you, gently guiding you into a chair while Matt held your shoulders steady, trying to keep you from collapsing under the weight of the pain.
“Hey, hey,” Kelly said softly, his hand warm and steady on your back. “Breathe. We’ve got you.”
You blinked up at him, the world still swaying and your vision a blur, but you didn’t want to show how bad it was. “I’m fine, Kelly. It’ll pass. I just need a minute.”
Matt crouched down in front of you, his hands on your knees. He was more than familiar with migraines—he knew how they could escalate in an instant, how they could leave you feeling completely helpless. “Y/N,” Matt said gently, his voice firm yet comforting, “I know it’s tough, but we’re not letting you push through this alone. It’s not worth it.”
You shook your head, trying to argue, but the words fell short. The aura was still making everything feel out of focus, and the nausea continued to roll in waves. Your stomach churned with each passing second, and the dizziness made it impossible to think clearly. You took a deep breath, still unwilling to admit just how bad it had gotten.
Matt didn’t push back. He knew you hated when things got out of control, but he also knew the signs. He looked at Kelly, and the two of them exchanged a silent understanding. Kelly nodded, then turned back to you.
“Y/N, you need to take your sumatriptan,” Kelly said, his tone calm but insistent. “It’ll help. We’ll make it as easy as possible for you, but you have to take it now.”
You looked at the small injection in Matt’s hand, the familiar sting of the needle already making your body tense. You hated the idea of taking it, the vulnerability it made you feel, but deep down, you knew it was the only thing that would give you any relief. You gave a reluctant sigh, not wanting to admit how bad the pain really was.
“Fine,” you muttered, holding out your arm, not meeting either of their eyes. “Just… just get it over with.”
Matt’s expression softened as he prepared the needle, then gently administered it into your arm. The sting was sharp, but it was over quickly. He didn’t say anything at first—he just sat back and rubbed your shoulder, letting you adjust to the sudden wave of warmth that came with the medication.
“Thank you,” you whispered, your voice strained and hoarse from the vomiting. You hated that you needed the help, but it was a relief to know that Matt and Kelly were there, that they wouldn’t let you fall apart alone.
“Of course, Bug,” Kelly said, his voice soothing as he ran a hand through your hair. “We’re here. You just need to rest. It’s okay to take a break.”
Matt stood up slowly and gently helped you to your feet, his hand never leaving your back. “You’re not going back to work, Y/N. Not while you’re like this. Let’s get you to my office so you can rest.”
You tried to protest, tried to tell them you were fine, but your body wasn’t listening. The medication was kicking in, but it hadn’t fully taken hold yet, and the pain was still strong. Kelly and Matt didn’t give you the chance to argue. They guided you to Matt’s office, a quiet, dimly lit space away from the chaos of the firehouse. Kelly helped you settle into the worn-out couch, his touch gentle as he tucked a blanket around you.
“You’re going to rest, okay?” Matt said, sitting beside you. His eyes were soft with concern. “I’m going to stay right here with you. You don’t have to push through this on your own.”
You closed your eyes, trying to block out the world. “I’m fine,” you muttered again, but the words were weak, and you knew they weren’t true. You could feel the exhaustion creeping in, the relief slowly beginning to take hold.
Kelly smiled, his voice warm as he gently rubbed your back. “We know. Just close your eyes. We’ve got it from here.”
Matt pulled up a chair beside the couch, never taking his eyes off you, staying vigilant but calm as he kept a hand on your arm. The minutes passed slowly, but gradually, the world started to return to its usual clarity. The sharp pain in your skull began to dull, replaced by a softer ache. The nausea, too, began to subside.
“Better?” Matt asked quietly after some time, his voice full of that unspoken care you had come to rely on.
You nodded, your body feeling lighter, the worst of the migraine now behind you. “Yeah,” you whispered. “Much better.”
Kelly’s hand stayed resting on your shoulder, his touch still warm and comforting. “You just needed a little time, Bug. You don’t have to go through this alone.”
Matt smiled softly, his gaze steady on you. “You’re strong, but it’s okay to lean on us when it gets tough. We’ll always be here.”
As the pain receded and your body began to relax, you allowed yourself to sink into the softness of the couch, comforted by the presence of Matt and Kelly. The firehouse might be busy, chaotic, and loud, but in this small, quiet space, you knew you were safe. You weren’t alone. And for once, that was enough.
Guys I’m back kinda, I thought I’d share this - since I haven’t been all that active I’ve been back at work. Only a month to go! But I hope you all enjoy this and thank you for all of the continuous love on my other Chicago fire fics! 🫶🏻
Matt Casey is married to his dead best friend Andy Dardens little sister. Y/n is the PIC on ambo 61 and her partner on ambo is Gabby Dawson.
Y/n and Matt are taking care of Ben and Griffin since Heather is in prison. Everything is good between Matt and y/n, they are doing the best they can with taking care of two boys.
Y/n finds out that she is pregnant and one evening when the boys are asleep y/n tells Matt that she’s pregnant.
A little smut if you can get that in to the story, and of course if you feel comfortable with it.
Aunt & Uncle to Mom & Dad
Here's my first Matt request! Comments really appreciated ❤️
“Thanks Gabby. I’ll ride back to the house with Matt.” I called over my shoulder getting out of the passenger seat of our ambulance truck. She waved bye to me as I quickly went inside the school. Moving down the hallway I found my brother's older son Griffin sitting outside the principal's office. Putting a hand on my hip I shook my head at him asking. “Is Casey already talking with him?”
“Yes, aunt Y/n.” Griffin nodded before I opened the door and shut it behind me seeing Matt was already talking with their principal and hadn’t noticed I was there just yet.
“Believe me, Griffin and I are gonna have a long talk the minute I get off shift. This won’t happen again.”
The principal sighed heavily sitting at his desk. “I have to say, Matt. This whole childcare situation doesn’t exactly instill me with confidence.”
“We’re making the best of it.” Matt told the principal simply.
“And who exactly is we? If you don’t mind me asking?”
Waving to the pair I finally introduced my presence in the office, walking up to the principal I shook his hand sitting down beside my boyfriend. “I guess it’s time I introduce myself, I’m Y/n, Y/n Darden. Ben and Griffin are my nephews. My brother Andy was also best friends with Matt here, that’s why we were both asked to take care of them by their mother Heather.”
“And how exactly do you know Mr. Casey?” The principal shifted his gaze between the two of us.
Gently looping my fingers through Matt’s I responded knowing this all is a bit much, especially considering we aren’t even married yet. “He’s my boyfriend. And as I said a minute ago my sister in law Heather asked both of us to watch out for them until she gets out.”
“Well it’s good to know that neither of you is having to raise these two young boys by yourself.” The principal nodded and thankfully he let us take the boys home after that. Matt and I had called into our captain and let him know we weren’t going to be able to finish out our shifts tonight but that we would them up another time.
Once we all had finished eating dinner I sent the boys off to get ready for bed. Matt was cleaning up the kitchen while I went to check on the boys, finding that Ben was asleep but Griffin was still awake so I whispered into the room getting his attention. “Can’t sleep, buddy?”
“I miss my parents.” He sniffed beginning to let some tears fall down his face.
Sitting down on the edge of the bed I gently ran a hand down his back knowing it always made me feel better when my brother would do it when I was upset. “Yeah. I miss your father too, Griff. I’m going to tell you something that most people say but when I say it you should know that it’s the truth.”
“What’s that, Aunt Y/n?” Griffin asked me, looking up at me.
Tracing patterns on his back I sniffed back some tears that were appearing in the corner of my eyes when I began explaining to him. “The same pain that you feel about missing your father I feel it too. I lost my brother. A lot of people will try to understand or claim that they know what you’re going through and some do and then some don’t. But I can tell you right for certain that I understand 100% what you are feeling when it comes to missing your father.”
“Thank you, Y/n.” Griffin spun around and flung his arms around my neck, crying some happy tears.
Wrapping my arms around his waist I kissed his forehead gently holding him tightly against my body until I smelled the fabric of his shirt suddenly feeling sick to my stomach for some reason. “You’re welcome - urgh!” Separating myself from the kid I dropped down on my knees grabbing his trash can in the corner and puking the dinner that I had eaten.
Griffin jumped down from his bed running over to me with concern. “Aunt Y/n, are you okay?”
“Uh - I guess dinner isn’t setting right for me.” Wiping my hand across my mouth I cleared my throat, sending my nephew a weak smile. “I’m alright. You don’t need to worry. Now get some sleep, you’ve got school tomorrow.”
He nodded going back over to his bed and climbed underneath the covers. “Goodnight Aunt Y/n.”
Leaving the two boys' bedrooms I entered my shared bedroom with Matt going directly to the bathroom. Rummaging around in the cabinet until I found a box of pregnancy tests I had recently bought at the store. Locking the door I sat on the toilet peeing on the stick and waited for the results, hearing a knock on the other side followed by my boyfriend’s voice. “Y/n, Y/n, are you okay. Griffin told me you got sick a few minutes ago in his room.”
“Give me a minute, Matt.” I called back to him, reading the time on my phone and seeing the test should be ready. Slowly opening the bathroom door I found my boyfriend leaning in the doorway until he saw me holding a pregnancy test in my hands. “There’s something I gotta tell you. I know that you’ve always talked about having kids and I know we haven’t really been trying but it’s -“
“You’re pregnant.” A huge grin crossed Matt’s face, stopping me from finishing my sentence, scooping me up into his arms and connecting our lips in a passionate and slow kiss.
Matt signaled me to jump and I wrapped my arms around his waist still holding the test in one hand. He walked me over to the bed and I tossed the test onto the bedside table. We fell down onto the mattress finally breaking the kissing to catch our breath. “So you’re happy, Mathew?” I giggled watching him begin to remove his shirt and I shrugged my own over my head throwing it somewhere onto the floor.
“Hell yeah I’m happy.” He chuckled, nuzzling his nose with mine, helping me remove my clothes and I did the same thing to him until he was hovering over me completely naked. He scanned my face more so asking about me having his kid then having sex. “Are you okay with all this? I know your nephews are enough of a handle right now.”
“We’re first responders, Matt. Having a baby has to be easier than the things we face on a daily basis.” Laughing playfully I wrapped my arms around his neck drawing him in for a kiss. He slowly slid his body into mine and the maitress began squeaking underneath our movements.
Matt bent his head down leaving kisses down my neck until he reached the crook of my neck, I moaned instantly when he kept kissing that particular spot. “I love you, Y/n - you’re gonna be a mama.”
Grabbing the sides of his face I pressed his forehead against my own. “Love you too. You’re going to be a daddy, Matt Casey.”
Matt smashed his lips upon mine with my back being pressed against the mattress some more. “Our next goal is finally getting your name changed to Mrs. Y/n Casey.” I threaded my fingers into his already messy hair, our bodies molded together letting us get lost. Our family of four would soon become a family of five and we couldn’t be happier.
Featuring: Matthew Casey, fem!reader, Kelly Severide, Christopher Herrmann, Wallace Boden, Firehouse 51 ensemble
Warnings: the whole station meddling, idiots in love
This time you really have no excuse. Matt didn’t even ask you to do this. But the thing is, he’s Matt now. Your Matt – in your mind at least. It’s been six months since the almost kiss on New Year’s Eve. And you’re still... friends. And because your FRIEND Matt is working on the 4th of July with his men, you decided to take charge of the catering.
On a normal day they find the time to cook and sit down to eat. Today that is unlikely. Since human beings take any excuse – and preferably holidays – to turn off half their brain. With a sigh you get out of Matt’s truck and grab the first cooler along with a box of sports drinks.
You’re about 20 feet from the bay door when Herrmann hollers, “Casey! Your girlfriend is feeding us again!”
The heat spreads all the way down the neckline of your summer dress. In Herrmann’s defence though – he, Cruz and Otis immediately get up to help unload the truck. It looks as if you interrupted them checking gear after a call. You enter the common room and nearly collide with Matt. He grabs your arms and takes a quick step back.
“Hey. So, that’s what you needed my truck for. You’re feeding us – again.”
Before you can summon a protest, he’s taken the cooler and the drink box from you and carried them over to the kitchen counter.
“Well, I figured you’d be busy on the 4th of July.”
“Yeah, we usually are. And with the heat we’ll get even more calls.”
The others bolt through the door, loaded with more supplies. Herrmann looks at you, “You mind setting up a quick lunch? We just came back and still have to put the truck back in order.”
You smile, “That’s what I’m here for.”
“So, would you go out with me?” that’s Kelly’s voice from behind you.
“What?”
He shrugs, “Until now I thought you just kept bringing food to have an excuse to see Casey. But if you’re not – I’d never turn down a pretty lady.”
“Well, tough luck, Kelly. I’m not even remotely interested,” you latch onto the second half of his statement.
Any possible answer is cut off by the next alarm.
For the next seven hours the guys come in, grab something to drink, take a quick bite and the next alarm sounds. They’re even splitting between who checks over the truck and who takes a short break. By the time the sun finally sets, they resemble a group of grouchy, sweat-soaked, exhausted gremlins.
The Gremlins have polished off the food and the drinks you brought for lunch and dinner by six. So, you make a resupply run to the store. When Chief Boden notices the bags and boxes, he comes over to where you’re prepping the next batch of meat filled pastries.
“Hand me the receipt, please.”
“Ugh, that’s really not necessary, Chief.”
He looks at you, “I say it is.”
You hand the receipt over and he hands you twice the amount. Apparently, he’s decided to fully financially cover the holiday catering. Given your mortgage, you say, “Thank you, Chief.”
Waving you off, he takes one of the muffins you brought.
You snuck onto the roof as the fireworks started and enjoyed watching them illuminate the skyline. The guys are still out on a call, probably because of fireworks. Which makes you like the colourful spectacle in front of you a little less. You sincerely hope people finally go to bed or at least stop doing dangerous nonsense.
It’s close to eleven by the time the calls have stopped somewhat. The gremlins get to shower and emerge as very tired, freshly dressed firemen. This time everyone gets to sit around the table and demolish the leftovers as a late-night dinner.
You’re mentally calculating the time it’ll take you to finish cleaning the kitchen and storing the rest. Your eyes are starting to burn and your feet hurt. In the quiet at the table Kelly speaks up, “Casey, get your woman to bed. She’s asleep just sitting there. We’ll take care of the kitchen.”
You blink, “What!?”
Matt looks at you, “Kelly is right, you’re dead on your feet. Do me a favour and lie down in my quarters. You shouldn’t drive home like this.”
You huff and go to lie down. You’re lacking the energy to argue.
Waking up, you nearly fall out of the bed as you try to turn over. Huh. Also, the blanket is only a sheet. But the pillow smells nice. Wait... the pillow smells like Matt?! Right. Alright. You went to bed in Matt’s quarters. Because you were exhausted. But where did your poor man sleep then?
You push off the blanket, get up and remake the bed. You look at your phone to check the time. The screen is black. Yeah, you didn’t charge it at all yesterday. There’s a gentle tap on the door window.
“Come in.”
Matt smiles at you, “Good morning.”
“Good morning.”
“Ready to head home? The guys packed the truck so I can drop you off at home.”
“Yes, thank you.” You follow him out into the dormitory.
Matt turns. “For what? You were the one who cooked and catered to the whole house for hours on end on a holiday.”
You shake your head. “You were working – on a holiday.”
You both have reached the bay where everybody is lingering. It’s like they’re waiting for something. Then Herrmann calls out, "For God's sake, get married already."
You stare at him, "We're not even dating."
A chorus of voices answers, “That's the problem.”
Followed by Herrmann adding, “Casey, have mercy on the poor woman and ask her out already.”
While Matt replies, “Herrmann, stay out of it.”
You hurry out the bay in the direction of Matt’s truck. Matt doesn’t unlock it immediately after he catches up. Instead, he leans over the truck bed in the early morning light and looks at you. "Would you like to?"
“Like to what?” you shoot back irritated.
“Go out with me,” Matt clarifies.
You take a breath and grip the door handle tighter, yet your answer comes out as a quiet huff, “Yes, please.”
This is the official companion to No Resolutions for New Year's Eve
Hence these idiots wouldn't leave Herrmann, Kelly, or me alone.
My contribution to the 4th of July celebrations of 2026. Happy holiday, dear readers across the pond!
Description: May 14th was always a hard day in the Firehouse, most of all for Matt and Kelly. Remembering Leslie's death was never easy but thankfully, Kelly now has Stella and Matt has you by his side.
Warning(s): references to character deaths, Matt's PTSD, mental health talks, if I missed anything lmk!
The 13th of May.
You knew from the moment you woke up it would be a tough day. Matt joined you in the kitchen, solemn as he accepted his cup of coffee.
“Morning…” You kissed his cheek and he wrapped his arms around you. There was a heavy silence as you stood in the kitchen, thinking about the day ahead. Rarely did you see Matt struggle but there were a few days a year that always struck a chord; the anniversary of Darden’s death and the anniversary of Shay’s were the most predominant.
Your morning routines passed in near-silence, the two of you occupying your shared space with gentle touches and quiet reassurances. You’d tried once to convince him it would be okay to take the shift off but he’d been firmly against the idea, wanting to keep himself busy with the Firehouse.
“Call if you need anything, okay?” you requested gently as you walked Matt to the door and handed him his keys.
“Promise.” With a tender kiss on the forehead, Matt left. It made your heart ache to watch how much this day hurt him. You had been told by fellow firehouse wives that it was never easy to see them out the door before every shift. They’d told you that being married to Matt would mean being married to the job most of the time too.
But for the most part, in the five years you’d been together, you’d never known him to bring the job home. Sure, there were times when he came home and didn’t want to talk or even think about the shift he’d had. Sometimes it drove you crazy, knowing he was keeping it all to himself. But losing Darden and losing Shay had been two losses he’d never kept secret from you.
So when you got the chance, you stopped by the Firehouse on your way back from work. Everyone greeted you with a smile and friendly wave, accepting of your presence in the Firehouse from pretty much the first day you’d started seeing Matt.
“He’s in his office,” Herrmann assured you, pointing to the door at the end of the corridor.
“Thanks, Herrmann.” You stopped outside of his office and knocked on the door. He called out for you to step inside.
“Hey, sweetheart…” He looked up from his desk and sat back in his chair. Matt opened his arms for you to join him in his lap and of course, you obliged.
“How’ve you been?” you asked as you settled in his lap, draping an arm around his shoulders and pressing a kiss to his temple.
“I’ve felt better,” he admitted with a quiet sigh, accepting your affection without argument.
“I bet. Look, once you’re off shift, I was thinking we take a nice hot bath, order takeout and watch a few crappy movies, hm?” Your fingers traced through his hair, hoping to soothe him.
“Sounds good…” he agreed quietly, resting his head against your chest.
After that, it was a matter of waiting until Matt came home and making sure everything was set up and ready for the two of you to relax.
As promised, he came home, and the two of you took a bath, Matt sat in front of you and let you dote on him, easing the aches from his muscles with each tender touch, whisper and kiss. Then, once you were done, takeout was already on the way. Settled on the sofa, Matt draped himself over you, face buried in the crook of your neck. Tangled together, it made the ache in your chest ebb away ever so slightly.
“You’re so brave, Matt, doing the job you do… And you can talk to me about it, don’t ever feel like you can’t,” you assured him softly, fingers running through his hair, listening to the sounds of your breaths mingling together.
“Thank you…”
“She’d be so proud of you, Matt.” He hummed softly, falling into a lull, knowing he was safe.
Featuring: Matthew Casey, fem!reader, Kelly Severide, Christopher Herrmann, Wallace Boden, Firehouse 51 ensemble
Warnings: the whole station meddling, idiots in love
This time you really have no excuse. Matt didn’t even ask you to do this. But the thing is, he’s Matt now. Your Matt – in your mind at least. It’s been six months since the almost kiss on New Year’s Eve. And you’re still... friends. And because your FRIEND Matt is working on the 4th of July with his men, you decided to take charge of the catering.
On a normal day they find the time to cook and sit down to eat. Today that is unlikely. Since human beings take any excuse – and preferably holidays – to turn off half their brain. With a sigh you get out of Matt’s truck and grab the first cooler along with a box of sports drinks.
You’re about 20 feet from the bay door when Herrmann hollers, “Casey! Your girlfriend is feeding us again!”
The heat spreads all the way down the neckline of your summer dress. In Herrmann’s defence though – he, Cruz and Otis immediately get up to help unload the truck. It looks as if you interrupted them checking gear after a call. You enter the common room and nearly collide with Matt. He grabs your arms and takes a quick step back.
“Hey. So, that’s what you needed my truck for. You’re feeding us – again.”
Before you can summon a protest, he’s taken the cooler and the drink box from you and carried them over to the kitchen counter.
“Well, I figured you’d be busy on the 4th of July.”
“Yeah, we usually are. And with the heat we’ll get even more calls.”
The others bolt through the door, loaded with more supplies. Herrmann looks at you, “You mind setting up a quick lunch? We just came back and still have to put the truck back in order.”
You smile, “That’s what I’m here for.”
“So, would you go out with me?” that’s Kelly’s voice from behind you.
“What?”
He shrugs, “Until now I thought you just kept bringing food to have an excuse to see Casey. But if you’re not – I’d never turn down a pretty lady.”
“Well, tough luck, Kelly. I’m not even remotely interested,” you latch onto the second half of his statement.
Any possible answer is cut off by the next alarm.
For the next seven hours the guys come in, grab something to drink, take a quick bite and the next alarm sounds. They’re even splitting between who checks over the truck and who takes a short break. By the time the sun finally sets, they resemble a group of grouchy, sweat-soaked, exhausted gremlins.
The Gremlins have polished off the food and the drinks you brought for lunch and dinner by six. So, you make a resupply run to the store. When Chief Boden notices the bags and boxes, he comes over to where you’re prepping the next batch of meat filled pastries.
“Hand me the receipt, please.”
“Ugh, that’s really not necessary, Chief.”
He looks at you, “I say it is.”
You hand the receipt over and he hands you twice the amount. Apparently, he’s decided to fully financially cover the holiday catering. Given your mortgage, you say, “Thank you, Chief.”
Waving you off, he takes one of the muffins you brought.
You snuck onto the roof as the fireworks started and enjoyed watching them illuminate the skyline. The guys are still out on a call, probably because of fireworks. Which makes you like the colourful spectacle in front of you a little less. You sincerely hope people finally go to bed or at least stop doing dangerous nonsense.
It’s close to eleven by the time the calls have stopped somewhat. The gremlins get to shower and emerge as very tired, freshly dressed firemen. This time everyone gets to sit around the table and demolish the leftovers as a late-night dinner.
You’re mentally calculating the time it’ll take you to finish cleaning the kitchen and storing the rest. Your eyes are starting to burn and your feet hurt. In the quiet at the table Kelly speaks up, “Casey, get your woman to bed. She’s asleep just sitting there. We’ll take care of the kitchen.”
You blink, “What!?”
Matt looks at you, “Kelly is right, you’re dead on your feet. Do me a favour and lie down in my quarters. You shouldn’t drive home like this.”
You huff and go to lie down. You’re lacking the energy to argue.
Waking up, you nearly fall out of the bed as you try to turn over. Huh. Also, the blanket is only a sheet. But the pillow smells nice. Wait... the pillow smells like Matt?! Right. Alright. You went to bed in Matt’s quarters. Because you were exhausted. But where did your poor man sleep then?
You push off the blanket, get up and remake the bed. You look at your phone to check the time. The screen is black. Yeah, you didn’t charge it at all yesterday. There’s a gentle tap on the door window.
“Come in.”
Matt smiles at you, “Good morning.”
“Good morning.”
“Ready to head home? The guys packed the truck so I can drop you off at home.”
“Yes, thank you.” You follow him out into the dormitory.
Matt turns. “For what? You were the one who cooked and catered to the whole house for hours on end on a holiday.”
You shake your head. “You were working – on a holiday.”
You both have reached the bay where everybody is lingering. It’s like they’re waiting for something. Then Herrmann calls out, "For God's sake, get married already."
You stare at him, "We're not even dating."
A chorus of voices answers, “That's the problem.”
Followed by Herrmann adding, “Casey, have mercy on the poor woman and ask her out already.”
While Matt replies, “Herrmann, stay out of it.”
You hurry out the bay in the direction of Matt’s truck. Matt doesn’t unlock it immediately after he catches up. Instead, he leans over the truck bed in the early morning light and looks at you. "Would you like to?"
“Like to what?” you shoot back irritated.
“Go out with me,” Matt clarifies.
You take a breath and grip the door handle tighter, yet your answer comes out as a quiet huff, “Yes, please.”
This is the official companion to No Resolutions for New Year's Eve
Hence these idiots wouldn't leave Herrmann, Kelly, or me alone.
My contribution to the 4th of July celebrations of 2026. Happy holiday, dear readers across the pond!
tag list (UPDATED—if you’ve already filled the old one out, please fill this one out instead) || kinktober tag list
ao3
buy me a coffee!!
warnings: SMUT MINORS DNI–praise kink, unprotected sex, squirting, language
the first time your praise kink was discovered, it was when you were at the firehouse visiting matt. you had volunteered to make food and none of them complained. matt whispered, “you did a great job, baby” and nibbled your ear. he knew immediately something happened when you just stood there. he looked at you with a knowing face.
when he got home, he found you sitting on the couch watching a show. he paused the show and you looked at each other.
“don’t think i didn’t see what me telling you that you did a great job today had on you. does my baby have a praise kink?”
you nodded and he smirked. he pulled you onto his lap so you were straddling him. he was wearing sweatpants and a sweatshirt and you were wearing his sweatshirt and black lace panties.
he moved you to his thigh and started to move you. the pleasure was instant.
“fuck! matty, please”
“please what?”
“help me”
he snaked one hand down and started rubbing your clit.
“that’s my good girl. look at you getting yourself off on my thigh. keep going baby”
you felt like you had to pee and you asked him to stop, but he knew what was coming, and continued to rub your clit faster.
“are you gonna come for me? yeah? that’s it. good girl. come for me baby. good girl”
the bubble burst and fluid was gushing out of you and onto his gray sweatpants. he helped you ride your high out while whispering praises to you. when you came down, you fell against him and he kissed your head. the realization hit you and you popped up.
“did i just squirt?”
he laughed a bit
“yeah you did baby. who knew it took me saying ‘good girl’ for that to happen?”
“well i’m still horny as fuck and i can tell you are too. take me to bed and continue to praise me?”
he kissed you and spent the rest of the night praising you.
Silence the Green-Eyed Monster - Matt Casey x Reader
Anonymous: hey love! you absolutely smashed the last fic! can I request another casey x reader? could imagine they’re in a relationship and keep it a secret. somehow someone gets jealous and they can’t hide it anymore? thanks love x
Thank you so much, you’re too kind! ❤️ Ugh, I can’t explain how much I love the ‘secret relationship’ fics, so thank you for requesting this. I kinda went off on a tangent but it’s all Casey fluff so I’m not sorry 😝 Also went a little more protective Casey for the big reveal but there’s still some jealousy in there. Enjoy this long ass fic! 😊
Warning: Mention of and reference to smut, nothing particularly detailed.
wc - 6,257
You took a deep breath as you awoke, the warmth of the room from the sun shining through the gap in the curtains mixing with the smell of fresh sheets was a moment you treasured each morning. It’s what kept you grateful. You knew in your line of work that all it took was a bad call to have your future ripped away from you. That you knew from personal experience. Only this morning, along with the previous few, there was a different scent swirling into the mix. It was a cosy combination of something very musky and woody, with a hint of smoke.
Taking a moment to cherish how lucky you were before you fluttered your eyes open, you remembered the events of last night, which brought a light blush to your cheeks, as you became aware of how you were both completely naked. Matt had his chest flush to your back, an arm draped around your waist and hugging you softly and his breath was ever so slightly tickling your neck.
That’s when a smile grew on your face, one of those grins that were impossible to hold back, not that you wanted to. For the past three days, Sylvie Brett, your best friend, partner and roommate, had gone back home to Fowlerton to face her parents for the first time since she broke off her engagement with the Chaplain. She had spoken to them over the phone, of course, but as soon as the chatter died down in her hometown about her antics and she had worked up the nerve to show her face again, she decided to take a few days off and visit them.
And while you were going to miss your best friend, even if it was just for five days, you were excited to finally be able to spend a couple of nights with your boyfriend. You and Matt didn’t get to do this often (unless you booked a hotel room, which was becoming an expensive endeavour), and it wasn’t just about the sex. You loved the domesticity of it all, cooking dinner together, laughing, talking, listening to music, cuddling on the couch whilst watching a movie. You felt complete when you were with Matt, and it was something you were never going to get tired of, and neither was he, if your relationship continued in the direction it was going in.
When you and Matt first started seeing each other, it was just over a year after Gabby left. You had replaced her on Ambo, quickly becoming a part of the 51 family with little to no grievances towards you. You were pretty sure Matt actually wasn’t a fan of you at first, seeing as you technically took someone’s place who he didn’t want to be gone, but he soon got past it, and you both actually became good friends. You had the same sense of humour, a similar taste in music and you both liked the same movies, so you had a lot to bond over. And you fell hard.
At first you were angry at yourself. How on earth could you fall in love with a colleague - a superior - let alone one who was still grieving from his divorce? Only, however hard you tried to stop yourself, you just ended up making it worse. For example, if you tried not to meet his topaz blue eyes as he smiled, you became more aware of how gorgeous his laugh sounded and decided immediately you didn’t get to hear it enough. See the problem?
But one night at Molly’s changed everything. It was Christmas time last year, and after saying a last goodbye and happy holidays to everyone before you went back to your hometown, you left the bar just as Casey was entering.
You were practically beaming from ear to ear as you approached the door. Herrmann had a loop of classic Christmas hits on throughout the evening, and you were still feeling the rush from when Casey dragged you into his little office back at the station earlier to exchange gifts with you. You argued that you weren’t technically allowed to open it yet, seeing as Christmas wasn’t for a couple more days, but Matt had persuaded you by telling you how much he wanted to see your face when you opened it. Of course you couldn’t say no to such a sweet admission, especially from Matt. It was totally worth it when you excitedly ripped off the wrapping paper to reveal a photo album full of memories from the past year and a half. It brought a tear to your eye and a smile that lit up your face, as did the expression that Matt wore. He was so elated that you loved it, enjoying how he got to see the smile he adored so much.
So you said a last goodbye and then swung open the gorgeous wooden door, stepping out into the freezing Chicago night. That’s when you ended up being so close to Matt Casey that you could feel the warmth of his breath before it got cooled down by the air.
“Oh, sorry, Matt.” You laughed slightly awkwardly as you took a step back.
“No, it was my fault. I was in a bit of daydream.” He smiled.
“Well, I, er, was just heading out. Wanted to say goodbye before I make my way home tomorrow morning.”
“Oh, okay, well, have a good Christmas, Y/N.”
“You too, Matt.” You smiled back, raising your eyes away from his face (because your heart was telling you to just lean forward and do what you’ve wanted to for months) to look up in hopes to catch a glimpse of the stars. Only, you didn’t see them, you saw the little bunch of green leaves adorned by white berries, and your eyes widened.
Matt was confused by your expression, so he followed your eyeline, being met with the same thing; mistletoe. When he looked back down once again at your face, you were biting your lip, your eyes flickering between his mouth and his eyes dangerously. You’d never know how desperately he wanted to use his thumb to free your bottom lip from your teeth, but the thought soon disappeared when you leaned in.
He met you halfway, lips brushing against one another’s in uncertainty before you pushed forward, pressing a not-so-chaste kiss to his mouth, something which he didn’t expect but wasn’t mad about. It quickly became heated, all the pent-up sexual tension you both harboured for months being poured into the kiss, the way your hands wrapped around his neck, how his found your waist and then your ass when you pressed him against the wall behind him.
Breathless, you pulled away, painfully aware of how you were still in the doorway of Molly’s, letting out a little laugh. “We should probably get out of here, before someone finds us.” You smirked. All Matt could do was nod, wearing that boyish grin of his with a hint of lust in his eyes, before he pulled you quickly to his truck to make a quick getaway.
One thing led to another, and after finally admitting your feelings for each other that night, you became a ‘thing’ that had now been going strong for about six months. ‘Thing’ is the only way you felt right describing it, seeing as you two were exclusive but no one knew about it yet, apart from both of your families.
That had been Matt’s idea, to keep your relationship secret. He felt worried that the house might have a bit of a problem with it, seeing as the wound from Gabby leaving is still a little tender for some of them. And though you didn’t share the same concern, you understood and therefore agreed. Plus, it was going to be fun sneaking around for a while, possibly even sexy.
Little kisses being trailed along your shoulder are what informed you Matt was coming out of his slumber.
“Good morning, sleepyhead.” You smiled even though he couldn’t see it.
“Morning, babe.” He mumbled against your shoulder, still half dazed, before letting out an almighty yawn.
“Still tired?” You chuckled, gently turning over to face him.
“Do you blame me? We were at it like rabbits last night.” He grinned wide at the way your cheeks flushed.
“Well, too bad we have to get up for shift, otherwise you could’ve given me a reminder.” You winked before sitting up, pulling the sheets with you to cover your chest.
“We could always take a shower.” Matt teased, reaching out a hand to draw shapes on your thigh.
Though the motion cause goosebumps to raise on your skin, you shook your head lightly, biting your lip in his direction before standing up and pulling on one of your oversized t-shirts.
“No time. I need to drop you off home, remember? How about I make some quick breakfast whilst you get dressed and then I’ll drive you.” You offered.
“Sounds lovely.” He said, finally moving to get ready whilst you slipped away to the kitchen.
You were halfway into making some French toast when you heard the keys in the door. At first you thought you imagined it, blaming it on the fact you were still a little drowsy. But you knew you couldn’t imagine Sylvie standing right in front of you.
“Something smells good.” She exclaimed, which really woke you up.
“Sylvie!” You practically shouted, both out of shock and as a way to alert Matt about your unexpected company. “I thought you weren’t coming back for a couple more days?”
“Wasn’t planning on it, but I knew as soon as I got there that five days was gonna be too long, especially when everything there was reminding me of being with Kyle.” She visibly shuddered, taking a seat at one of the stools at the breakfast bar. “I just felt trapped, you know? My parents understood and were fine with me coming back early. I called Boden last night to let him know I’d be available for shift today, and I also called you, but you didn’t pick up.”
“Sorry, I didn’t even realise, I was a little busy.”
“I can tell.” She smirked. You raised an eyebrow at her. “Whoever you were getting busy with has left his shoes at the door.”
Your eyes went wide in shock as she chuckled. ‘Shit’ you thought.
“Would you like me to go hide in my room whilst you get mystery man out of here?” She smiled. God, you love this woman.
“Yes please.” You replied sheepishly.
She slid off the stool and went to pick up her bag by the door. On her way past you she stopped, smiled over at you and said, calmly, “Oh, and say hi to Casey for me.” whilst pointing nonchalantly at the CFD captain’s jacket hung on the coat rack before practically skipping to her room.
You were absolutely gobsmacked. You quickly served up the French toast before going back into your room to find Casey sat on the edge of the bed with an amused look on his face.
“Did you…?” You asked, gesturing with your thumb to the kitchen.
“Yeah, I did.” He chuckled.
You shook your head, the shock finally wearing off as you went to pull on a pair of sweats from your drawer. “I swear she should’ve become a detective.”
***
You and Brett along with Truck 81 and Engine 51 were making your way to a vehicle accident just five minutes after your shift started. You hadn’t had a chance to speak to Brett yet about this morning, so you saw the drive there as the perfect opportunity.
“Listen, I owe you an explanation.”
“No you don’t.” Brett smiled sincerely, flickering her eyes over to me to show she was being genuine before looking back to the road.
“Well, I want to. It wasn’t just last night, me and Casey. We’ve been seeing each other for nearly six months now, and I really wanted to tell you, I did, but Matt asked me to keep it a secret, just for a bit, so I did, and…I’m sorry.”
“I know, Y/N. I figured it out a little while ago. I’ve seen the way you look at each other and have your little hushed conversations and comfort each other discreetly after a tough call. It’s okay, it’s none of my business, and I’m not mad.” She chuckled, and I let out a deep breath in relief. I figured she wouldn’t be, but I wasn’t sure. “By the way, I think you’re really good together.”
“Thanks.” You smiled at her as you pulled up to the scene of the accident.
You pulled up just after Truck, surveying the scene as you slowed to a stop. A car had collided with a parked van, its engine letting off a lot of smoke. You and Brett hopped out, grabbing the jump bags and then making your way over to the car where Casey had already begun talking to the patient.
Herrmann came over with a halligan to pry open the driver’s door while Casey went around to the passenger side, smashing the window and climbing inside. You thanked Herrmann before peering in, seeing that the guy had his leg pinned in, which is why Casey had climbed in.
With gloves on, you examined the laceration the guy had on his forehead, most likely from slamming it on the wheel on impact.
“How’s he doing?” Brett called from behind you.
“He’s alert. Laceration to the face, left leg is pinned.” You replied, looking over to Casey who shifted in his seat to get a better angle before jamming his halligan into the footwell to free the driver. Meanwhile, you put a c-collar on him, noticing his rapid breathing at the same time and so you tried to calm him down by making small talk.
“How is it you managed to crash into a parked vehicle?”
“I looked down to change the radio station. It was an emergency; they were playing Justin Bieber.” He let out a strained laugh.
“Say no more.” You chuckled.
“I knew you’d understand.” He managed to get out in panting breaths before he focused on you. “Your eyes are incredible by the way.”
You were a little taken aback by his last sentence, seeing as he was struggling to focus on keeping calm, let alone your face. You glanced over to Casey, still working diligently as he spared a look your way, his brows furrowed in confusion.
“I think you must’ve hit your head.” You smiled, just as the hood of the car burst into flames.
You ducked away, painfully aware that Casey was stuck inside the car. You trusted your colleagues in putting out the fire before it could harm anyone, but still your heart worried for any unexpected turns this could take, putting the driver and Casey in danger.
He managed to free the driver’s leg, shouting to the rest of Truck for a backboard. They safely extracted the driver, and almost immediately after, Casey swan dived out of the car, just as a fireball exploded from the car.
Stood by the gurney, you gazed over, your heart in your stomach as you waited to see if he was okay. A few seconds later, Casey was up on his feet on the other side of the car, and you let out the breath you didn’t realise you were holding. He looked over, trying to meet your eyes, and when he succeeded, he gave a little nod to tell you he was okay. And that’s all you needed to be focused once more, ready for the patient to be delivered to you by the firefighters.
***
It was a few hours later, just as you were finishing up restocking the ambo, when Casey emerged from the common room doors looking for you. You had sent Brett inside a few minutes earlier so she could get something to eat, offering to finish up on your own.
You smiled over at Casey as you ticked off the last box on your checklist, jumping down from your rig. He was making his way over to you when you heard, “Hey, there she is!” from a familiar voice behind you. “It’s the miracle worker with the big y/e/c eyes.”
You turned, being met by the guy you saved from the crash earlier today holding a bunch of yellow lilies and wearing a smile from ear to ear.
“Oh, hi…erm…”
“Mason.” He said, offering you the flowers.
“Yes, Mason, of course. Thank you so much, these are gorgeous, but you didn’t have to bring me anything.” You smiled at him, conscious of Matt standing a few feet away near the truck to make it less awkward. “How’s your leg?”
“Oh, they did an MRI, just a muscle tear, it’s no biggie. I just wanted to thank you for taking such good care of me.” He explained. His voice seemed smooth, seductive even, but you thought you were just reading too much into it, so you just smiled a little wider and tilted your head sincerely.
“Ah, well, just doing my job.” You said, and it came out a little more awkward than you would have liked, but he didn’t seem to notice.
It was then you felt extremely lucky as a call came over the intercom for ambo, so you took a deep breath before walking past him and moving to get into the rig. “Well, I gotta go, but thank you for the flowers.”
“I never got your name.” He followed you, looking through the window as you sat in your seat.
“Oh, um, Y/N.” You offered a small smile, but you desperately wanted to get out of there. You turned to your right to place the flowers down in the space in the console before turning back to him, only he was leaning his forearms on the windowsill and offering you a business card.
“Well, Y/N, I would be over the moon if you let me buy you lunch sometime.” His grin was a little creepier now he was so close, and you could smell the bitter coffee on his breath.
You took the card to be polite, but as soon as Sylvie jumped into the passenger seat, you sped off, looking in the wing mirror to see Casey leaned against Truck with his jaw tense and fists stuffed into his jacket pockets.
***
When you returned from Med after the call, Casey was nowhere to be found. You looked all over: the common room, Boden’s office, his own office, restroom, locker room. Nowhere. And you couldn’t ask around, in fear of being suspicious, although you could have lied and said you borrowed a book or were requesting some furlough, but you didn’t want to be caught out on that later.
In the end, you decided to go stand out on the apron for some fresh air and a good think. You were worried that he was upset about Mason coming and speaking to you earlier or about you taking the card, although you would be majorly surprised if he would be annoyed over that, seeing as he is one of the most understanding people you have ever met. What did surprise you, though, was when you looked up and saw him sitting on the roof of the firehouse in a fold-out chair.
“Jesus Christ, Casey, what are you doing up there?!”
“Just taking a moment.” He replied, and you finally noticed the ladder he had used to get up there propped up against the building. You started walking toward it to join him when you heard him stand up and walk over to it, his footsteps on the metal ringing out above your head. He slid down it skilfully, impressing you in the process.
“I would have come up there, you didn’t have to come down.” You shrugged, smirking at him slightly.
“With your fear of heights? No chance.” He chuckled.
You smiled at him. He didn’t seem annoyed. Just a little…off.
“I can see the cogs turning, Y/N. What’s up?” He said as he slyly hooked his little finger into yours. You both did this often when you wanted to show affection to one another at the firehouse but had to be discreet, just in case someone was watching.
“Are you okay?” You said, your voice a little higher than usual and brows slightly furrowed.
Matt raised an eyebrow at you. “Yeah? Why wouldn’t I be?”
“That…um…just with that Mason guy coming round earlier. I only took his card to seem polite, I have no intention of-“
“Y/N.” Matt interrupted, an amused twinkle in his eye, which made you relax slightly. “I know. I trust you, always have and always will. I love you.”
“I love you too.” You sighed contently. “And you have no idea how much I want to throw my arms around you and kiss you right now.”
He chuckled. “Me too, but Gallo’s coming this way and I’m pretty sure you don’t want to give him a show.”
You drew your hand back slowly, just in time for when Gallo emerged from the door.
“Lieutenant, Y/L/N, food’s almost done.”
“Thanks, Gallo.” You turned his way and shot him a genuine smile before following him in, Matt hot on your heels.
***
You thanked whoever was looking down on you for those minutes of peace within the firehouse, where no one was out on a call and you all got to relax, play cards, talk, read a book. The latter was one of your personal favourites, seeing as you were always engrossed in one novel or another. Talking with your friends was also another. You loved to hear about Herrmann’s kids, Gallo’s sad excuse for a love life, Severide and Kidd’s weekend getaway (although you weren’t too fond of the details, but luckily they usually skipped past those with merely a wink at each other). Right now, you and Brett were talking about the upcoming wedding of one of a previous mutual partner.
“Have you got your dress yet?” You asked her.
“Yep, got it last weekend. It’s a gorgeous blush pink maxi dress, and its so comfy. What about you?”
“Mine’s about knee length, a dark green silky material. I can’t wait to go, plus Maddison is going to look gorgeous.”
“She really is!” Brett gushed, looking over your shoulder at Matt, who was sitting three seats down at the end of the table. She lowered her voice, “Are you taking Matt as your date?”
Your eyes got a little sadder and you looked down at your fingers. “I’m not sure. I’d love to, and I probably could get away with if we said we were just going as friends, but I don’t know if we’d be able to keep it up or if they’d get suspicious.” You murmured. “I need to talk to Matt first, because it’s his call. Whatever he wants to do, I’m up for.”
She nodded gently, offering you a small smile before sitting up straighter and opening her mouth to speak, but before she could, Capp shouted from the doorway.
“Hey, Y/L/N, there’s someone outside to see you. Says his names Mason?”
You rolled your eyes, inhaling deeply before casting a glance over to Matt carefully. You got up from your chair slowly, with all eyes on you, and made your way out onto the apparatus floor.
“Hey, Y/N, how are you?” Mason beamed, making his way over to you with his arms wide open, as if he was coming for a hug.
You stayed still, arms crossed, showing him you didn’t accept the hug, and he stopped just short of you, smile a little weaker but barely altered.
“Hi Mason. What’re you doing here?” You tried to smile politely.
“Well, I wanted to ask you something. You see, I think you’re really pretty and you were so kind to me that I knew I couldn’t miss out on the opportunity on asking you out on a date. So, how does this Friday at seven sound?”
Your eyes almost shot out of your head, and you heard someone choke on their own laughter over at the squad table. ‘Glad someone’s enjoying the show.’ You thought.
“I…erm… that’s, um, very kind of you, Mason. And I really appreciate the offer, but I’m so sorry, I’m going to have to say no.” You answered, trying to convey how apologetic you felt on your face. You glanced around you, mainly at the squad table to see how they were all trying to act like they weren’t listening.
He didn’t seem to back down though, which furthered your observation of him being a little creepy. “Oh, come on, Y/N, just one date, you won’t regret it, I promise.”
Before you could reply, Severide shouted, “Hey, buddy, she said no, now get lost.” He was walking over to you to back you up, which you were extremely thankful for as you had no idea how to handle this situation to stop it getting out of control. Usually, you were pretty good at standing up for yourself and speaking your mind, but that doesn’t mean you don’t appreciate the back up from your friends when offered.
“This doesn’t concern you, pretty boy.” Mason snarled, and Severide squared his shoulders.
“What’s going on?” Matt called, coming through the common room doors to stand beside you. ‘Oh god, this could get messy.’ You thought, and you knew you had to diffuse it, and fast.
“Nothing, Casey. Mason here was just leaving, weren’t you?” You answered.
Mason seemed to soften up when you spoke. “Yeah, I was. Well, call me later, Y/N, and we can confirm that date.” He gave a toothy smile and a wink which sent a shiver down your spine, then left through the open door.
Once he was out of sight, you turned to Severide. “Thanks, Kelly, I owe you.”
“No problem, Y/N, but be careful with that guy. Something’s off about him.” He patted your shoulder as you nodded in reply, then went back over to sit at the squad table.
Casey didn’t say a word before walking through the double doors, but instead of going straight on to the common room, he took a right, walking down the corridor towards the bunk room. You waited for a moment before following him, slightly concerned. At this moment, you didn’t care if you raised anyone’s suspicions; you had a gut feeling something was off, and you needed to make sure Matt was okay.
You walked cautiously down the same route as Matt, entering the bunk room and looking straight towards his office. He was sat down at his desk, pen in hand and head rested on his fist, his brows knitted in either concentration or frustration, and you were pretty sure it was the latter. After a quick survey of the bunk room and being satisfied you were alone, you advanced towards his office, gently rapping your knuckles against the door to let him know you were there. He looked up, a blank expression on his face, and gestured for you to come in before looking back down at his incident report.
You opened the door but didn’t walk in, deciding to lean against the door frame and gauge the atmosphere first.
“Hey, you okay?”
“I’m fine.” He said a little snappily, not tearing his eyes away from his report for a second.
You bit the inside of your cheek in thought, then went and perched on the end of his bed, closing the door softly behind you. He made no effort to acknowledge your company, but he also didn’t object.
“Matt, baby, what’s wrong?” You almost whispered, despite no one being in earshot but your boyfriend.
“Nothing, like I said, I’m fine.”
“Well it doesn’t seem like it.” You said, and although the words could have been interpreted as snarky, you didn’t intend for them to be, and so you internally winced. “I didn’t mean it like that. You can talk to me, Matt, I want to listen.”
He stopped writing, and you were hopeful that he would explain, but a few minutes passed and still no words left his mouth. He turned around in his chair to face you, his eyes showing you that he was sorry, but his jaw was clenched and his left hand was still in a tight fist.
So you thought, you thought really hard as to what he was feeling and why he would be feeling like this. Had you forgotten something important? No, your anniversary wasn’t for a few more months and neither was his birthday. Had you forgotten to do the dishes? No, you both did them together last night after your meal.
And then it hit you.
He was jealous. Matthew Casey was jealous. And you smiled. A beaming smile that shone brighter than a lighthouse, because although it was annoying for him, you found it pretty funny and also very cute.
“Matt Casey…” You teased, standing up slowly and stalking towards him with your arms crossed and a tilted head. “Are you jealous?”
“What? No.” He splutters, trying to be convincing but it doesn’t work in the slightest.
You smirk at him. “Aww…Matt…”
“Fine, I guess I am a bit. It’s just…that guy, the way he was looking at you like you were his next meal, it just…it made my blood boil.”
“I know. Me too. It’s fair enough that you’re angry but you have nothing at all to be jealous of, I love you and only you.” You offer a smile, which he returns, before you check out of the window.
Seeing nobody, you placed your palms down on each arm of his chair, leaning down so you were inches away from his face.
He squinted his eyes playfully at you, smirking. “Risky.” He teased.
“Shut up.” You laughed, then locked your lips with his, giving him a searing hot kiss, your tongues meeting and fighting a battle for dominance, which he won. You explored each other’s mouths, not worrying for a second if someone would see because you wanted him, needed him, and he needed you. He bit your lip, causing you to moan into his mouth, and his lips tugged upwards into a smile.
You pulled away, breathless, and smiled, catching your bottom lip between your teeth as you dared to look into his eyes. It was a dangerous move, as his irises had turned a sinful shade of blue and all you desired was to pull him over to his bed and draw the blinds. Actually, fuck that, his chair would do.
But you managed to stand upright, clearing your throat as you felt your cheeks reddening. You regained enough composure to look back into his eyes, and he seemed more relaxed, barring the bulge that was now evident in his pants, which you were proud of causing.
“By the way, I love you too. And you didn’t have to prove it, I already know, not that I’m complaining about getting that kiss out of it.”
“Yeah, well, you’re gonna get a lot more than that tonight, seeing as you’re extremely hot when you’re jealous.” You teased, taking pleasure out of the way his eyes grew wider.
You winked at him before turning and leaving his office, swaying your hips a little more than usual, chuckling when you heard the curse he let out under his breath.
***
It was next shift, and thankfully you hadn’t heard any more from Mason, mainly because you hadn’t called him or been at the firehouse, so you were a little on edge as you turned up this morning. But it was after lunch, now, and you were convinced that he had finally come to his senses and moved on.
You were reading your book, sat at the long table facing the rest of the common room with Matt one chair away, once again sat at the head of the table. You felt his foot tracing patterns on your ankle, and when you looked up from your page and over to him, he was looking through his eyelashes at you as he read over his reports from last shift. He had a devilish smirk on his face, and he knew I was thinking of the other evening, when he pulled me into the showers to fulfil my promise, trailing hot, wet kisses along my jawline, down my neck and over my collarbone, slowly working his way down until he was on his knees in front of me, unbuckling my belt as I stood in a blissful daze, my heart racing and my breathing rapid.
In fact, I could feel it picking up again, and I knew what he was doing. It was unbelievably arousing how the risk of being caught felt, something we discovered after that event in the showers. And now Matt had begun playing a game, and so had I. A squeeze of my ass when I was folding laundry later on that day was what started it, but I got him back when I trailed my fingertips up his thigh at dinner, cupping his clothed member in my hand, which caused him to almost choke on his bite of food.
We were enjoying it, and after talking the other day back at my apartment, he told me how he didn’t mind if the others found out, but at the moment it was still fun sneaking around, which I agreed with.
“Y/L/N?”
Severide’s voice from the door startled me, but I didn’t jump, thank goodness, before I turned to look at him.
“That Mason guy is back again. Want me to kick his ass out?”
You smiled at Kelly, shaking your head gently. “Yes, but politely please, Severide.”
“Are you sure?”
“Positive.”
He nodded and left, and you went back to ‘reading your book’. That was until you heard shouts coming from the apparatus floor moments later, followed by the sound of someone bursting through the double doors.
“Hey! You can’t go in there!”
“Y/N?!”
‘Oh, for crying out loud’ You complained internally, rolling your eyes before looking over to the door to see a very frantic Mason.
“There you are, Y/N. That moron was trying to stop me coming inside.”
“Yes, Mason, that’s because I asked him to.” You explained, softly, standing up and circling around the table to stand in front of him. “C’mon, lets go talk out in the corridor so we don’t disturb anyone.”
“No! I want everyone to hear this. Y/N, just give me a chance. I’m a nice guy, I’m funny, I’m smart, I’m good looking. Just say yes, you won’t regret it.”
You had to stop yourself from groaning. This guy was ridiculously desperate, and you couldn’t understand how he didn’t get the message. It was actually starting to annoy you now.
“Mason, I’m sorry, it’s a no, it’s always going to be a no. Now please, leave, before you get dragged out of here.”
“Please, Y/N, just one date, that’s all. I don’t know why you won’t agree to it.” He was walking closer and closer, but you stood your ground, despite the nervousness starting to grow within you.
“Hey! She said no.” Casey said sternly, on the verge of shouting, as he got up from his chair and came to stand beside you, wrapping his arm tightly around your waist and bringing you closer to him. “She’s said it about five times now. You’ve got your answer, now get the hell out of here before I knock your ass out.”
Mason just stood there, dumbfounded, his eyes darting between your face, Casey’s and his arm around you. “oh, man, I’m so sorry, I didn’t realise she was…I…I guess I’ll…er…” He stuttered, turning and leaving so fast you were surprised he didn’t leave scorch marks.
You exhaled deeply, scratching your forehead before turning towards Matt.
“You okay?” He asked sincerely, searching your eyes for any unease.
“Yeah, thank you.” You smiled, leaning your head on his shoulder and breathing in his scent to comfort yourself. He brought his other hand around to draw soothing circles on your back, and your heartrate began to slow back down to normal.
And then it dawned on you that you had an audience.
You heard someone clear their throat, so you straightened up slowly, leaving Matt’s embrace almost fully as you look around the room. Brett and Kidd are struggling to stifle a chuckle, Cruz looks like someone’s told him he’s pregnant and Mouch looks more confused than when he was trying to solve that crossword puzzle this morning.
“Did we…er…miss something, or are you guys just putting on a show for that guy?” Herrmann asks, trying to make sense of everything.
You and Casey smile, enjoying the revelation, albeit more prematurely than you both would have preferred.
“No, Hermann, you’ve all just been blind for the past six months.” Casey chuckled.
Herrmann’s eyes almost fell out of their sockets. “Six months?!”
You both burst out into laughter, then you turned to face Matt once again, leaning up to kiss his cheek, which is tugged upwards into a smile.
Then you both went and sat down where you were before, now only closer and with your hands intertwined upon the table, ready to be bombarded with questions from your family, ready to share your love for each other with the world.
Summary: With Jay deep undercover and completely off-grid, Y/N Casey is staying at her big brother Matt’s house—where she’s surrounded by love, safety, and the ever-watchful eyes of her brother and his husband, Kelly Severide. But when a quiet day at home turns into a cascade of seizures and neurological symptoms, Y/N finds herself vulnerable, scared, and struggling. Matt and Kelly step in without hesitation, doing everything they can to keep her stable and comforted. In the absence of Jay, the two men who love her endlessly remind her she’s never truly alone—even on the worst days.
The morning started off quietly—sunlight spilling across the hardwood floors of Matt and Kelly’s home, the smell of coffee lingering in the air. Y/N sat curled up on the couch, blanket tucked around her legs, her favorite oversized hoodie swallowing her frame.
Jay had been deep undercover for nearly two weeks now, radio silent, and she missed him more than she let on. Being at Matt and Kelly’s helped—more than she could admit—but today… today just felt off.
Her head ached, vision swimming every few seconds. The familiar pressure behind her eyes warned of trouble. She’d already had two focal seizures since waking—small, disorienting ones—but enough to leave her drained and anxious. Her muscles were sore, her limbs trembling. Her speech felt thick, her coordination off.
Matt noticed first when he came in from the kitchen, coffee in hand. “Hey, Bug,” he said gently, crouching in front of her. “You’re pale. When was the last time you ate something?”
Y/N blinked slowly, as if processing the question took extra energy. “Not hungry,” she mumbled.
Kelly came over, frowning. “You’re shaking.”
“I’m fine,” she said quietly, though the words slurred slightly, betraying her.
“You’ve had seizures, haven’t you?” Matt asked softly, concern rising.
She didn’t answer. But the way she curled deeper into the couch was all the confirmation they needed.
Kelly gently pulled the blanket tighter around her. “That’s it. Couch day. You’re not lifting a finger.”
Matt disappeared for a moment, returning with her rescue meds and a hydration pack. “Take this, just in case. And we’re keeping track of timing now, okay?”
Y/N nodded, though her eyes looked far away. “I miss him,” she whispered. “Jay.”
Matt’s heart cracked just a little. “I know, sweetheart. But you’re not alone, alright? We’ve got you.”
Kelly kissed the top of her head. “Always.”
By midday, things got worse.
She had a full tonic-clonic seizure in the hallway, collapsing as she tried to get up for the bathroom. Matt caught her just in time, lowering her to the floor while Kelly called for an ambulance.
“She’s postictal, barely responsive,” Matt told the dispatcher, panic tightening his throat. “She’s not bouncing back like usual.”
When Stella and Violet arrived with Ambo 61, Stella’s face went pale. “How many seizures today?”
“Three that we know of,” Kelly answered. “She’s not herself. Speech is slurred, keeps blinking like she’s seeing double.”
“Neurological flare,” Violet murmured. “Let’s get her to Med—now.”
Connor was already waiting in Trauma 2 when they arrived.
“Put her on oxygen—let’s get an EEG and neuro labs going,” he instructed quickly. “She’s tachycardic and confused—possible non-convulsive activity happening.”
Y/N whimpered as they laid her down, eyes glassy and unfocused.
Matt stood at her bedside, rubbing her arm, his voice cracking. “You’re okay. We’re right here.”
She blinked at him. “Matty… ‘m scared.”
“I know,” he whispered, swallowing his own fear. “But we’ve got you. I promise.”
It took hours for the seizures to stop—hours of meds, EEG monitoring, and slow stabilization. She drifted in and out of awareness, clinging to Matt’s voice and Kelly’s hand.
Connor stepped in just as things started to settle. “It’s been a tough day, but she’s past the worst. We’re admitting her for monitoring—she needs rest and full neuro workup. And hydration. Her body’s exhausted.”
“She’s not the only one,” Matt murmured, brushing her damp hair off her forehead.
That night, while Y/N slept in the quiet room onthe nuero floor, Kelly draped a blanket over Matt and handed him a cup of hospital coffee.
