Matt Casey x FBI Halstead Girlfriend Reader (One Chicago x Criminal Minds)

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Summary: The BAU gets a case in Chicago. The team knows you have a boyfriend; they just don't know who he is or where he lives.
Pairings: Matt Casey x FBI Halstead Girlfriend, BAU x Reader, Intelligence x Reader, Firehouse 51 x Reader
Warnings: Fluff

The serial arson case was in Chicago and you were excited to be back in the Windy City after being away for months. You texted your boyfriend and brothers after you were situated on the plane.

"What's got you all smiles," Prentiss asks, setting her bag down.

"Chicago's my home. I was texting my brothers that we were coming," you tell her as a text from Jay pops up.

Jay: new case?

You: yeah why?

Jay: Voight called the FBI a few hours ago

"Apparently my brother's boss called us," you say as the rest of the team boards the jet.

"Who's your brother," Morgan asks.

"I have two. Will's a doctor and Jay works with the Intelligence Unit at 21st."

"Hank Voight called us," he asks, surprised.

"Yeah, according to Jay."

You land a few hours later and head to the 21st. You see Trudy at the front desk and she gives you a hug before buzzing you guys in. You walk up the stairs and Jay sees you walk over to him.

"Hey, sis."

"Hey, big bro."

Voight and Hotch do the introductions and assignments; Reid, Ruzek, Prentiss, Rossi, JJ, Antonio, Hailey, and Burgess to the scenes, while you, Jay, and Morgan went to Firehouse 51. Jay looked at you and chuckled when he saw your eyes light up. You practically ran to the SUV and called dibs on driving before Jay and Morgan could open their mouths.

"What's got her all excited," Morgan asks.

"Her boyfriend works at 51," your brother explains.

Twenty minutes later, you pull up in front of the station. You see Sylvie and Emily at the ambulance, and the Squad crew at their table. Sylvie sees you and smiles, quickly handing her clipboard to Emily before running over to you.

"What are you doing here," she asks.

"Serial arson case. We need to talk to Matt, Kelly, and everyone else," you tell her.

Matt walks onto the apparatus floor and sees you talking to Sylvie on the apron. He makes his way over to you with Kelly in tow.

"Hey, baby Halstead," Kelly says, hugging you.

"Hey, Sev."

You turn to Matt and smile.

"I've missed you so much, babe," he tells you.

"What am I missing," Morgan asks.

"Der, meet PIC Sylvie Brett, Lieutenant Kelly Severide of Squad 3, and Captain Matt Casey of Truck 81. Guys, meet SSA Derek Morgan with the BAU."

"And Casey's your boyfriend?"

You nod your head.

"Jay, you take Matt, Der you can take Kelly and I'll take Hermann to start," you say.

You find Hermann and take his statement in the conference room. After you finish, you interview Stella, Sylvie, and Emily. Jay takes the rest of 81 and Morgan takes Squad. You walk out of the conference room and make your way over to Matt.

"How long are you gonna be here for," he asks.

"However long it takes to get this bastard," you tell him.

"Then it's back to D.C., huh?"

"Maybe. I'm gonna ask Hotch if I can take a few weeks off and stay with you guys."

Jay and Morgan walk over to you guys after they finish talking with Chief Boden.

"Hotch says Reid has the profile," Morgan says.

You nod your head and turn back to your boyfriend.

"First round at Molly's, after the case is wrapped, is on me," you say, kissing him.

"I'll hold you to it," he replies, kissing you back.

"Let's go, lovebirds," Jay calls from the SUV.

You head back to the station and deliver the profile. Three days and ten fires later, you wrap up the case.

"First round on me," you ask everyone.

Both teams, minus Hotch and Voight, nod in agreement. You head to Molly's and see the firehouse is already there. Matt makes his way over to you and your team with Kelly and Sylvie in tow.

"Team, meet PIC Sylvie Brett, Lieutenant Kelly Severide of Squad 3, and Captain Matt Casey of Truck 81. Guys, meet SSAs JJ Jareau, Emily Prentiss, David Rossi, and Dr. Spencer Reid."

"Captain Casey is Halstead's boyfriend," Morgan adds.

"And this is my other brother, Dr. Will Halstead," you say as your ginger-haired brother walks over.

Everyone makes their rounds as you and Matt sit at the bar.

"I talked to Hotch. I can stay in Chicago but I'll still be working on BAU cases remotely," you say as Hermann puts two beer bottles in front of you.

"Good. I miss having you in Chicago," he says, kissing your lips.

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