Summary & Notes: Lexi Shay (Leslie Shay's twin sister), a Detective in the Intelligence Unit, deals with her sister's death, the end of her relationship with Severide and her budding relationship with her partner Halstead. What happens when she finds out she's the reason for her sisters death? How will she cope? How is an old case she worked involved? Notes: Jay/OC, Kelly/OC. Cameos of characters from Chicago PD and Chicago Fire. Lindsey doesn't exist. Burgess is a Police Officer within the intelligence unit.


Chapter 1 – Undercover.

Lexi Shay sat at the edge of the pool, her feet swaying back and forth in the water. It was a rare moment of peace, she was enjoying the cool night air and the house being empty.

The last four months had been none stop, being undercover was taking its toll. Lexi had started as a Police Officer working for the Intelligence Unit 6 months before, she was new to Chicago, so they had taken advantage that no one had seen her before and put her to work straight away to go undercover with the East side Cartel or the E.S.C as they liked to be called.

Lexi had spent a month working her way in with the top dealer in Chicago, Benny. The E.S.C were running drugs, mainly pills up and down the East coast. She had been living as Lexi Jones, with three of the top dealers for three months.

Benny was the top dog, he was a bit of an idiot, but the supplier trusted him, and he was the one who bought Lexi on board. Calvin was a weird guy, Lexi was very cautious around him and was glad she had a lock on her bedroom door, then there was Jay, Jay was a whole other story. Jay had moved in two weeks after Lexi had. He was a good guy, he was smart and could handle himself in any situation, he had been an Army Ranger, so she understood why Benny had recruited him.

In two days, Lexi would be in the same room as the drugs, the dealers, the money and the supplier, the task force would bust in and then her job was done.

Lexi heard the patio door slide open and turned to see Jay walking towards her, ok the last three months of living with three dudes hadn't been that hard to deal with, Jay made it easier. "Don't get any ideas" Lexi warned Jay as he got closer to her, he had a habit of throwing her in the pool whenever he got the chance.

"Wouldn't dream of it, Jonesy" Jay used the nickname he had given her as he squatted down and kissed her lightly on the lips, she pulled away after a few seconds, Jay frowned at her "hey, I wasn't done" she reached her arms up and he pulled her up to stand in front of him, she kissed him again and bit his lip a little as she pulled away again.

Jay smiled at her, she got butterflies in her stomach as he brushed her hair behind her ear. She felt like a fool, she was falling for this guy, a drug dealer, she was falling in love with a drug dealer. After three weeks of Jay moving in, he had kissed Lexi and they had been a couple ever since or acting as a couple as Lexi thought of it.

"Where are the guys?" Jay asked noting the relevant silence of the house.

"Benny had a date, and god knows what Calvin gets up to" Lexi laughed not even wanting to imagine what Calvin did when he had a night off. Lexi took his hand in hers and lead them both to the sun loungers a few feet from the pool.

Lexi put her feet up on hers and Jay sat on the opposite one, his feet on the floor, running his fingers absentmindedly up and down her exposed tanned leg. "So now we're alone, I need to talk to you"

Lexi didn't like the tone of his voice, he sounded worried, she had never heard him worried before, he had always been happy, funny, carefree almost. "okay, this doesn't sound good"

"It's not" Jay stared in to her blue eyes, he didn't know what he was doing or what he was about to say he just knew he had to do something to protect her, protect this girl he had only know a short time but already felt so strongly for. "Don't come on Friday" He meant the supplier drop.

Lexi laughed without humour "Don't do that" Lexi began swinging her legs off the lounger, so her legs were next to his and she was sat up. "Don't turn in to some over protective prick. I've earnt my place there just as much as you have"

"I'm not denying that!" Jay assured her taking her hands in his "I've got a bad feeling about the whole thing, I don't want you there, to get caught up in something that could go bad, fast!"

Lexi knew Jay's 'bad feeling' wasn't unwarranted, she knew they were all going to be arrested and all serve hard time. She smiled sweetly at him, "Jay it will be fine, it's a simple exchange of goods for cash nothing will go wrong"

"I'm asking you, I'm begging you" Jay shook his head "please don't go. I don't know what I'd do if something happened to you"

Lexi didn't like the intensity of his stare, she stood up and went to walk in to the house. "I'm not having this conversation Jay" he grabbed her arm as she passed him stopping her from walking away.

Jay stood up and kept his grip on her wrist, so she couldn't leave. "Lexi, I'm a cop!" He had just broken the number one rule of undercover work, he had blown his cover to protect a criminal, but he couldn't see her get hurt or put away. He studied her closely for a reaction, he couldn't tell what she was thinking. He had to make her see sense, had to get her to keep away from the deal, he had to help her. "The Springfield police department are going to bust in on that deal and arrest everyone"

Lexi's mind went in to overdrive, was this a trick to get her to confess? Was he telling the truth? If he was telling the truth, why didn't the intelligence unit know about him? Why would he break his cover? She searched his eyes, looking for any hint of a lie or a sign he was playing her. She was a cop, she had good instincts, she hadn't been recruited to the Intelligence Unit for her charming personality, her gut told her he was telling the truth. "Well you might want to tell them to coordinate with my boss at the Intelligence Unit of the Chicago police department"


Lexi sat in the passenger seat of the beat-up mustang that Jay was driving. He had asked Benny if they could both take the night off, Benny had agreed stating they all should take the night off, tomorrow was going to be a big day.

Lexi was lost in thought, her head resting on the glass of the window watching the scenery whizz by as Jay drove faster than he should be on the coastal roads. She had no idea where he was taking her, he just insisted she go with him.

Tomorrow was going to be a long day. The meet was happening at a disused warehouse at 2pm. The exchange would take place and as soon as drugs and money changed hands she would say 'it was a pleasure doing business with you gentlemen', then the Intelligence Unit and Springfield PD would burst in, take down everyone and arrest them all.

After they had both revealed they were working undercover, they had set a meeting with their respective bosses and they were all working together. Voight had told Lexi they would discuss the implications of her revealing she was undercover, without his permission, when the whole thing was over. She wasn't looking forward to that conversation.

Lexi's brain played every scenario through her head like a movie reel. She knew she wasn't going to sleep much tonight, if at all. Jay pulled her from her thoughts as he took her hand from her lap and put it to his lips, "worried about tomorrow?"

It would be her first take down, her first major bust, the finale of her first time undercover "a little" she admitted smiling at him. She took her eyes from him to look at the road as she felt the surface of the road change as Jay pulled off the road.

"It will be fine" Jay assured her kissing her hand again, pulling the car to a stop and killing the engine, "we're here" He had taken them to a cliff edge, the ocean a 100-foot drop below.

Lexi got out of the car and walked to the guardrail, peering over to see how far down the ocean was. It was a beautiful spot, the ocean crashing below and the smell of salty air. Lexi turned from the edge smiling to see Jay sat on the bonnet of the car watching her. "it's beautiful here" Lexi told him climbing up on to the car to sit beside him.

"Your beautiful" he told her kissing her softly. "They call it Lovers Look-out"

Lexi lay back on the windscreen looking up at the sky, the sun had set about an hour before, but the sky still had tinge of orange and pink as dark ominous clouds slowly rolled in.

Jay lay beside her entwining their hands. "I wanted to spend our last night together, just the two of us." Lexi turned her head to look at him, Jay continued realising she didn't quite understand the point he was making, "I figured after tomorrow is over, we won't see each other, we'll go our separate ways."

Lexi's chest tightened, she had been so worried about the actual takedown that she hadn't even thought about the fact that when it was all over Jay would go back to Springfield and she would go back to Chicago.

Tears filled her eyes and she had to look up at the sky to stop them from falling. She was being ridiculous, she had only known Jay a few months, and what did she actually know about him? They were both playing a part, playing characters they had created. Lexi thought about asking Jay some real questions, had he really been an army ranger? What was his real name? But then she realised it would be harder to say goodbye to him if she knew the real him.

"Lexi, I lo…" his words were cut off as she kissed him. She teased his mouth open with her tongue and sighed in to him. Jay knew she had kissed him to stop him from saying the words aloud. Maybe she was right, maybe saying it would just make things harder.


Lexi had given the breach phrase six minutes ago and all hell had broken loose. Flash grenades had gone off, smoke filled the warehouse and bullets began to fly. Benny had been sat beside Jay, Jay had never seen someone react so fast, the second the door had been breached Benny had leapt to his feet to escape. Jay had given pursuit.

Benny punched Jay in the face, Jay blocked his second punch and got an uppercut to Benny's gut. Jay heard Lexi scream, and looked in the direction the scream had come from. It wasn't a scared scream, more of a pained scream. Distracted Jay didn't notice the gun Benny pulled from his waistband. The shot to his leg bought him back to his fight, Jay launched at Benny, fighting for the gun, gaining control of the weapon, Jay pushed his knee in to Benny's back "stay down, stay down" he warned pointing the gun at the back of his head.

Two officers appeared from the smoke "Benny Lake" Jay told them "take him in to custody". They cuffed Benny and took him away.

The warehouse had quieted, the bullets had stopped flying, the smoke clearing. Jay sat on the cold ground of the warehouse, his face bleeding, the bullet in his upper left leg bleeding but not too heavily. He had lost sight of Lexi, where the hell was she? "LEXI" he called out getting to his feet. He tried putting weight on his injured leg and found he couldn't.

"Hey Jay" Jay turned to see his Sergeant, Sergeant Best, rushing towards him

"Have you seen Lexi?" Jay asked accepting the Sergeant's help to walk.

"No, sorry, let's get you some help, then we'll find her" Sergeant Best suggested aiding him to walk out of the warzone that had become the warehouse.

Jay sat on the gurney as two paramedics assessed his injuries, "your lucky" he was told "the bullet just grazed you" he wasn't listening he was too busy scanning every face of the crowd of cops for Lexi.

Sergeant Best thanked the paramedics on behalf of Jay, "Thank you, give us a minute and you can take him to the hospital"

Jay was becoming anxious, he couldn't see her anywhere. "Boss, where is she?" Jay pleaded as his Sergeant began searching the crowd also.

"Right here" Jay heard her voice before he saw her, she came from behind him and appeared at his side, holding her left arm across her body. He assessed the damage, her right eye and right cheek were beginning to bruise, she was breathing shallowly. She watched his eyes assessing her "a couple broken ribs, going to have a black eye and I'm going to be sore for a while" She smiled a little trying to show him she was ok. "Looks like I fared better than you" she chuckled pointing at his injured leg.

"I'll give you two a minute" Sergeant Best announced before walking away.

Jay placed his hand on her good cheek and pulled her closer to him, she rested her forehead against his and closed her eyes. The noise around them seemed to fade. He had been so scared when he had lost sight of her, he had seen her chase Calvin and then she was gone. "I heard you scream, I thought…"

"Calvin got the better of me" Lexi explained her scream "kicked me in the ribs, he had me pinned. Voight stepped in, just before I broke his jaw."

Jay laughed, he had wanted to break Calvin's jaw a few times over the last few months "sad I missed it"

Voight called her from a distance away, she could tell from his tone of voice it was time to leave. Lexi leant down and kissed Jay's lips lightly, a silent tear ran down her cheek. "I have to go" Lexi stood up straight breaking their bubble, wiping the tear away "the big brass wants a briefing"

Jay's eyes burned in to hers. "Lexi I…"

"Don't" Lexi interrupted him "Please don't" she sighed deeply, "I know what your going to say and it's just going to make this so much harder." Jay reached for her hand and she allowed him to take it before beginning to back away from him. Their hands fell apart and Lexi turned to walk away. "Hey, what's your real name?" Lexi called over her shoulder

"Halstead, Jay Halstead" he called after her.

She turned to face him walking backwards as she spoke "Lexi Shay. Look me up sometime"


One week later.

Lexi entered Molly's and scanned the crowd, seeking her twin sister, Leslie Shay. Spotting her at a table across from the bar with a Latino woman Lexi didn't recognise. Lexi made her way through the crowd to her sister's table. Covering her sister's eyes from behind, she whispered down her ear "guess who?"

Shay squealed and jumped up and down turning to face her sister "oh my god, your finally back" they embraced, and Lexi couldn't believe how good it felt to hug her sister.

"Oh ow, gentle" Lexi warned pulling out of the hug, holding her broken ribs.

"What happened to you?" Shay asked assessing her sisters bruised right eye and cheek.

"Oh, it's a long story, that needs tequila" Lexi said looking towards the bar.

"oh god, how rude of me, Lexi this is my new partner Gabriela Dawson" Shay told her pointing to the woman sat across the table from her. "Dawson this is my awesome sister, Lexi"

Lexi offered her hand and Gabriela shook it smiling at her "I've heard a lot about you" Dawson confessed.

"Ah the other Dawson" Lexi smiled "I hope all you heard was good" Lexi said eyeing Shay suspiciously. "I went by your place and Clarice told me you're not together any more, you moved fire houses and your living with someone called Kelly?"

Shay rolled her eyes "four months is a long time to be gone…" she was interrupted, "I heard my name" Kelly Severide announced approaching the table. Lexi and Shay turned to look at him at the same time "oh damn, there's two of you."

Lexi and Shay weren't identical twins, but their resemblance was unmistakeable, Lexi had a natural curl to hair, wore it longer than Shay and parted it on the left side rather than down the middle. Their eyes and noses were the same, Lexi always thought she had thicker lips than Shay and was a little jealous as Shay's seemed to fit her features better.

Shay laughed introducing them, "Lexi this is Kelly, Kelly this is Lexi"

"Please tell me you're not gay" Kelly pleaded shaking Lexi's offered hand.

Lexi chuckled, "not gay yet still not interested"

Kelly laughed, "we'll see", he stared at Lexi as she stared back and took his beer from his hand taking a long drink.

"Oh god, put it away Severide" Shay said walking between them and pulling Lexi to the bar. "Hey Herman, can we get some tequila's?" Shay called out.

"And two beers" Lexi added seeing Jay enter Molly's. She tiptoed above the crowd and waved him over. "Hey" she said when he got closer, then hugged him. She introduced Shay and then asked if Jay and her could have a minute alone. Shay took her beer back to the table, leaving Lexi and Jay sat at the bar. "How was the drive from Springfield?" Lexi was happy to see him, they hadn't seen each other since the bust had gone down and she had missed him.

"Long" Jay told her before taking a swig of his beer. "Especially because I'm not sure why you asked me here"

"I have an offer for you" Lexi explained, she pulled her badge from her hip and placed it on the bar between them.

"Wow, you made Detective" Jay picked the badge up examining it, he was genuinely happy for her, she deserved the promotion.

"So, did you!" Lexi told him, he looked up at her the badge still in his hand, he frowned at her a little confused, he was still only a Springfield Police Officer. "I told my Sergeant about you, your background, well the parts I knew to be true, I said you'd be a good fit for the unit and I need a partner"

"Partners?" Jay asked raising his eyebrows suggestively at her, he clearly had a 'I've seen you naked moment' as he looked her up and down and subconsciously licked his lips.

"It would have to be strictly professional"

"I can be professional"

"Well then, Detective Jay Halstead" she smirked saying his full real name for the first time "you start a week Monday"