Title: Till Death do us Part
Chapter 1 – What Happens In Vegas…

Summary: AU After Shay's death, Kelly Severide heads to Vegas hoping to forget about his miseries for a while. After Nadia Decotis's death, Erin Lindsay heads to Vegas also hoping for a few days escape. But one night changes everything for both of them, putting them on a new life course filled with tension, romance and danger.

Disclaimer: Chicago Fire, PD and Med and its characters are the property of Dick Wolfe, NBC. I only own my evil muse (Alice-love her!) and any OCs that might come along.

A/N: We're back! And with a new Erin/Lindsay adventure! Yay! This will focus on them again but of course you know I'll have some beloved Sevasey broments as Matt helps Kelly try to cope with…well everything lol don't want to give too much away. So lots of danger/action/tension/hurt/comfort and romance to come! So this starts with the line from season 3 eppy 5 (Nuclear option) and then goes AU from there (I've rewritten that scene from eppy 6). Hope you all like it and please enjoy!

He wanted to forget…run away…disappear…anything to make the pain stop – the pain of watching his best friend die before his very eyes.

'Shay…Shay!...she's gone…shut up…I'm sorry….she's gone….NOOOOOOO'

He'd stay up each night…drinking or doing whatever he had to to try to make the pain go away. Nothing seemed to help. Matt was well meaning but after a while the well-meaning…just needed to go away. They all did. But as he said those words another thought formed…maybe he could go away? Just a holiday!

"You know what we need…a Vegas weekend…this weekend!"

He had mentioned it on a whim…after a few bottles and a beer buzz while playing poker at Molly's. A Vegas weekend sounded like the perfect getaway and with his team there…he wouldn't get into too much trouble – the gambling kind.

"A squad weekend…a team thing…don't make me order you…" he snickered and then went about playing his game. But the more he thought about it, the more it started to grow in his mind…in his heart. He had moved in with Matt to try to lessen some of the pain at Shay's absence but spent more time on the couch, floor or in the bed of total strangers than his own.

Anything to lessen the pain. Nothing so far was working.

A Vegas weekend…could just drink…play some cards…hang with the guys…forget about here….for a while…

But one by one the squad team bailed on him, most with flimsy excuses until he was sporting a complex as big as his headache and just as hard to remedy. In reality he couldn't blame them, as he wasn't exactly the best person to be around these days.

"Hey…"

Kelly looks up to see Matt in his doorway and leans back in his chair. "Hey…" he replies as Matt remains in place. "It's safe to enter," he adds lightly.

"Thought you might be ready to rumble like last time," Matt retorts with a slight smirk.

"I had a few hours of sleep last night…the last time…"

"I know," Matt starts as he quickly raises his hand to stop his friend's speech. "So…Vegas huh."

"Yeah…Vegas. Wanna come?"

"Can't…too much to do here with Christie and the whole divorce thing," Matt huffs as he slumps down onto the counter opposite Kelly's desk and rubs his face. "Jim's…he's something else but I think I'll be able to get him to see the light. Plus I wanna be here for Christie and Violet right now. New place…new start. Wanna support them."

"Yeah…makes sense," Kelly nods in agreement. "Just watch your back around that guy. Sounds like a real prick."

"Oh he is that," Matt replies as he looks at his friend in concern. "Kelly…you know I worry. I don't think you should go alone."

"I promise I won't drink and drive and I'm not taking that much to play the tables with. I just…I just wanna go and forget life for a few days. I…I asked the guys. Ah maybe it's my own fault. Doubt I'm good company these days."

"I wish I knew what to say…" Matt mutters in an undertone as Kelly looks up with a small smile.

"I'll be fine. I'll plant myself at some table…find some hot chick and just…forget about life for a few days," Kelly looked up with a grin as Matt shook his head just as his phone buzzed.

"I gotta go."

"I'll see you in a few days."

"Kelly…if you need anything…even if it's just to come down there and stop you from doing something stupid…call."

"I will."

Kelly watches Matt take his leave and felt his agitation somewhat settle as he sunk back into his chair. I'll just find a table and some hot chick and…"yeah…" Kelly groans as he rubs his face and then shuts off his computer and then stands up. He looks at a picture of him and Shay and feels a lump of emotion forming in his throat as he remains frozen in place.

He finally manages to pull himself away, grabs his duffle bag and heads for the front of Firehouse 51; Boden coming to Matt as both of them watch Kelly get into a cab and pull away.

"Think he'll be okay?"

"I hope so," Matt replies somberly. "I just hope he doesn't do something he'll regret."

XXXXXXXX

"Where are you?"

"At the airport and don't try to stop me. I have a few day's holidays coming and…and I need this," she replies in a soft tormented whisper; her watery eyes looking at the picture in her left hand.

"You shouldn't be going alone."

"Hank…I need to do this. I'll be fine. A few days. I'm gonna…"

"Fall off the wagon," he states flatly. "You know I'm not gonna sugar coat it."

"I can't…I'm the reason she's…I just need a few days away from here."

"Vegas?"

"I got a good deal. I'll see you on Monday."

She quickly hangs up and then looks at the picture in her grasp once more before she hears her own voice echoing in her head.

'Nadia? Has anyone heard from Nadia? I have tried to call several times…my fault she went out…it was for me…I did this!'

Her eyes instantly well and she quickly swallows; her brain reminding her that she was in public and to wait until she was in a private hotel room before she was to break down. Get a grip Erin…she inwardly scolds…don't walk onto the plane looking like you're about to break down.

She checks her ticket before she slowly stands up to answer the boarding call, not knowing in that moment that on another airline, one that had just left, was someone who was about to have a major hand in changing her life completely. Someone unexpected but someone that in the long run would be just what she would need.

"Vegas…here I come."

XXXXXXXX

His mood on the plane was misery-laden at best. He kept seeing Shay lookalikes everywhere or heard the name Lesley…or someone who sounded like her. He worried that his short escape would be fraught with misery and his plan to have a good time would backfire in the worst possible way. But as soon as he stepped into the hotel, the sound of laughter, music, the slots and just merriment in general lifted his mood and chased away most of his melancholy.

"Kelly Severide," he tells the desk clerk as he checks in. He takes the key to his room and heads for the elevator, anxious to just dump his stuff and park himself at a table for the next few hours. He had practiced tossing the dice and could only hope that lucky number eight would offer his wallet a few extra dollars.

Dressed in his plane attire, black dress shirt and blue jeans, Kelly takes only his wallet and keys and heads for the elevator and then down into the gambling arena on the main floor. He pauses for a moment at the entrance to just take in the exhilarating sights before him, a small rush starting to course through his system, promising some fun times ahead.

"Now…where is that craps table," Kelly states with a grin as he pulls away from his place and heads for the nearest table. He puts down his chips, leans over the table and tosses his first set of dice. No win. His mood remains the same, somewhat melancholy despite all the joy and mirth around him. He tosses them again. Seven. No win. What the hell am I doing here…alone?

Around the same moment he entered the gambling arena, she wandered into the same area, only from another entrance. Erin's lips tried to paste on a happy smile but it was a façade, an outward display to those teeming around her that she was just like them, there to escape their dismal lives for a few days but tell everyone looking that it was what they wanted not actually needed.

"Why…am I here…" she moans while pausing for a few seconds to consider going back to her room to just order in room service. You can hide away later…just walk around a bit and…her inner thoughts pause as she hears the faint beat in the distance calling to her. The club…go get a few drinks and dance your sorrows away.

She would do just that. But in order to do that she'd have to traverse the sea of gambling faces before her. Her eyes briefly wander from table to table, scanning the various faces as she slowly meandered toward the club, her brain wondering if there will be one who will catch her eye for…he's…she stops, her gaze focusing on one male figured slightly leaning over the craps table.

The black shirt hugged his well-formed upper frame, her eyes resting on his taut arms as they rested on the sides of the table; the rest of his body just as perfect. Personal trainer? Police officer? Whatever he does he keeps in shape! She was on a mission but couldn't help but just pass by a bit closer, wanting to observe and enjoy the view a bit longer but not wanting to be discovered doing so. That plan is rendered moot.

She nears the table and looks at the other gamblers, trying not to let her gaze wander over to the two sapphire pools now looking at her in wonder. They trade smiles and an instant spark is felt between them both; so much so that as soon as she turns to leave, tries to flee, his words pull her back.

"Play craps at all?"

"Nope…good luck."

"Hey wait a minute…come back. New girl luck…works every time, please? Come on. You're the shooter. Just…aim for the back wall," Kelly tells her with a smile; a smile that makes her feel weak in the knees. His eyes drop down to her shirt, a few top buttons open but leaving plenty to the imagination which he didn't mind in the least. Her jeans hugged every curve and he wondered what it would be like to have her legs wrapped around him.

"Eight easy!"

"Okay…what are we going for this time?"

"Another eight."

"Eight hard!"

She smiles and her dimples force his smile to grow and lean in a bit closer. Small electrical sparks continue to fly, starting to gain greater strength as the two of them draw a bit closer; the sounds of the happy crowds around them starting to be drowned out by their two rapidly beating hearts.

They could have blamed anything they wanted…the heat of the moment, the adrenaline rush from the back to back wins or the alcoholic buzz playing with their emotions and rendering them a bit helpless to the other's silent feral call but when their lips locked, everything changed. Warmth flooded through each of them, super charging their hearts and making their minds race with sexually charged thoughts.

But a passing remark, "hey…get a room," by a stranger, forces them to instantly take stock of reality and slightly pull apart.

"So…"

"So…"

Both of them utter at once and then smile; Erin's cheeks still flushed and warm and Kelly's entire frame on fire.

"I won."

"New girl luck," Kelly reminds her as both remain in place.

"Here…are your winnings," the clerk hands a small pile of chips to Kelly.

"Wanna get a drink or…something…spend them together," he urges with a smile that was driving her to want to just jump him right there. "Seems only fair. Or…did you have other…plans?" He asks hoping she wouldn't say she was on her way to meet…someone.

"I was going to…the club. Just want to dance and forget…life for a while. Sorry if that seems…morbid," Erin gently stammers as Kelly shakes his head.

But it didn't. In fact it was just what he wanted to do. Dance…get drunk…have some hot sex and forget about the intense inner pain still eating away at him, due to Shay's death. That was the plan…some of it would happen, but not in the order he wanted.

"Sounds great. Are you…meeting someone there?"

"No. Just me. Unless you come with me," she invites, her heart racing at top speed that his answer would be yes. Please…please you gorgeous stranger….say yes so I can lose myself in you for a few hours and then…go back home. her plan was almost the same as his. And much like his, it wouldn't go as planned.

"I'm Kelly by the way."

"Erin."

And that was it. No jobs…no oh where are you from? What do you do? Why are you here? Just…two people, two names and two reasons to want to forget about life for a few hours.

They enter the pulsing club, instantly ordering drinks and then hitting the dance floor – food being put on hold for a later time. The first drinks are consumed and the pulsing base seems to get louder, the pace a bit faster and their bodies coming a little bit closer.

Another round of drinks. His hands on her hips. Her body grinding into his as they start to think they are the only two on the dance floor…in the world.

Another round of drinks. A few bites of food and then back onto the dance floor to try to use up a bit more of the growing sexual tension.

"So…anything else you wanna do in Vegas?" Kelly's hot breath whispers in her ear; his voice holding a bit of a drunken slur. And despite the fact that her skin was already on fire, the warm air tickles her sensitive ear lobe sending new shivers down to her feet.

"Wanna…see Elvis," she retorts with a slightly slurred giggle.

"Me too!" He tosses back with a wide grin.

"Damn you're hot!" She growls as her hands latch onto his cheeks and pulls his lips back to hers; her mouth devouring his while their bodies continue to bounce with the beat.

"Mmm likewise," he adds as his hands slide down her back and rest on her butt.

"Hey you two…get hot and heavy in your room!"

Kelly looks at the couple beside them with a heavy frown and is about to make an angry when Erin's hand rests on his arm.

"Whoa tiger! I like that idea!" She states over the music as he turns back to her with a nod and grin. "I just want do crazy things for the next few days but I want them all to be legal!" She had mentally meant that she didn't want to end up in jail; but didn't audibly qualify that.

"Okay!" He answers back as he takes her hand and snakes his way back to their small table. "I need food."

"Let's find a room…and order in room service."

They finish the final round of their drinks, now being completely inebriated and not really in the best frame of minds to make sound decisions; especially serious ones. Instead of heading back into the belly of the large hotel and up to one of their rooms, they head for the exit doors and emerge outside into the cool night air; the pulsing beat still ringing in their ears.

They end up on the strip where the bright lights and loud sounds instantly start to assault their senses. "Too loud," Erin groans as she looks around, moving too fast and cursing as the world around her starts to spin a bit faster than wanted or desired.

"Hey…Elvis!" Kelly suddenly points as Erin turns to see a couple dressed in full Elvis & Pricilla 60's-esque attire.

"Let's follow!"

With a sloppy grin, Kelly's grip around her hand tightens and the two of them follow the costumed couple into a small building with soft lights and soothing music.

"Welcome," a man dressed in white greets them. "Please wait a few minutes."

"Sure," Kelly shrugs as he looks at Erin with a warm smile before he leans in and kisses her on the lips. Once again, their drunken stupor gets the best of them and their arms intertwine. But a polite, "ahem," forces them to break apart and once again offer sheepish smiles.

"I can…fast-track you two if you want."

"Legal right?" Kelly laughed, honestly thinking it was a joke and what he…what they were about to do wasn't that serious.

"We want," Erin grins as she leans into Kelly a bit more.

If they had had any kind of nutritional substance in their systems, to counterbalance the alcohol or a few less drinks, they might have been able to think clearly…maybe contemplate the real consequences of their actions a bit more…or consider just what they were doing. But that wasn't to be and ten minutes later the two of them were once again walking out of the small building, hand in hand and all smiles.

"My room…or yours?"

"I have a King sized bed," Kelly wags his brows, making her smile grow wider.

"I have handcuffs," she retorts playfully as his face flushes further.

And by the time they finally make it back to his room, their hands are rapidly undressing the other, tearing off and tossing various articles of clothing in various directions. Kelly's black shirt goes flying, the shirt with a neatly folded piece of paper tucked into the upper pocket; a piece of paper he put in there without stopping to read it.

A piece of paper that simply but 'legally' read: "State of Nevada…Marriage Certificate."

A/N: well…how did you all like the start to this new adventure? Oh boy…what happens when they realize just whats happened? When will that actually happen? In Vegas or back home…thinking what happens in Vegas…? How are those at 51 and 21 gonna react when the news comes out? And how will our couple react to their life changing news? Would love your thoughts so please do review before you go and thanks so much!