Author's note: So I've been working on this story for a long time, and going back and forth as to whether to post any of it. But today I decided to post the first chapter, and then we'll see. I'm up to chapter 18 on my laptop!

This is set sometime after the end of season 3 of Chuck, but goes kind of AU, so I'd advise not trying to pin it too closely to the timeline! None of the characters belong to me, etc etc – if they did, I would be in bed with Casey, not writing this.

The first few chapters are pretty heavy on the smut, but like all relationships, the plot increases and the smut decreases over time!

Chapter 1

John Casey stood at the hotel bar nursing a scotch. The place was full of men in suits with an overinflated idea of their own importance, and Casey was reaching the point when he'd have to leave before the growl that was building up in his chest actually escaped. It was bad enough being stuck in Washington as it was, without having to put up with these assholes in order to get a drink.

He picked up his glass and knocked back the last mouthful, and then he saw her. Striding into the room, heading confidently towards the bar as she simultaneously surveyed the place, a tall brunette with her hair escaping from a stubby ponytail, dressed in a khaki shirt and jeans so tight he could almost pick out the individual muscles in her long legs. She looked a little travel worn and her heavy desert boots were filthy, but there was something about her that made heads turn. She sat down at the empty bar stool next to him and signalled the barman.

"Scotch, double, straight up." Her accent was British with just a hint of a US twang.

Casey gestured the barman to put it on his tab and refill his own glass too. He was intrigued, and he figured there was no harm in buying her a drink. She turned to him as the barman poured.

"Thanks, I wasn't sure they'd actually serve me, underdressed as I am." She shot him a grin, and as their eyes met the attraction was so instant that Casey had an irrational urge to take her mouth there and then. Her lips parted for an instant and then she snorted with laughter and he noticed the dimples in her cheeks that matched the laughing sparkle in her narrow dark eyes. She was probably around thirty five, and strikingly attractive.

"You look alright to me." He raised his glass in a toast to her, their gaze still locked, and she grinned again.

"Well, I guess I can't compete with those ladies over there," She indicated with her head to a pair of women sitting further down the bar in tiny cocktail dresses and impeccable makeup, "But then I guess they're at work, right?"

Casey snorted slightly at her candid assessment of the women as high class prostitutes. He'd made the same judgement himself, but then sizing people up was his job.

"Whereas in my line of work," she said, glancing down at herself, "This is practically evening wear."

"So what is your line of work?" He skimmed his eyes up and down her form, taking in again the casual outfit, muddy boots and mussed hair. If he was honest with himself, he was also taking in the long toned legs, full breasts and curving waist. No point pretending otherwise, she had a knockout body. Curvy and fit, just his type.

She shot him a cheeky smile and then very deliberately gave him the same once over he'd just given her. Her eyes took in his muscular form, and he felt his cock twitch as her gaze lingered candidly on that area before moving up to take in the broad chest, finally coming back to meet his eyes again. "Wouldn't it be more fun to guess?" She knocked back her scotch in one.

He smirked back at her. It had been a long time since he'd met a woman like this, since he'd felt attracted and challenged and intrigued.

"I need another drink first though," She turned slightly to attract the barman's attention, and Casey noticed a slight pull in the back of her shirt. He couldn't swear to it, but he was pretty sure she had a weapon tucked into her waistband. Curiouser and curiouser. For a second he considered the possibility that she'd been sent here to target him in some way, but he dismissed it. Nothing to gain, not here in Washington, and besides, anything to make this trip more interesting...

Drinks replenished, he took his shot at assessing her. "You're not military, not got the bearing for it, but judging by the way you ran your eyes over everyone in here as you walked in, I figure you're no stranger to dangerous places."

She inclined her head slightly, a small smile playing on her lips.

"I don't figure you for medical personnel, or aid worker, and you clearly know how to handle yourself," He leaned forward slightly and ran a hand down her back, lightly tapping that slight bulge in the small of her back - a knife. She shivered slightly at his touch, but then the dimples were back. "So I'm going to go with journalist. War correspondent maybe." Ilsa… No, nothing like Ilsa. Ilsa was a spy, remember?

She laughed. "Not bad! Documentary film maker actually, but you're pretty much on the money. Just got back from a few months with the boys in Afghanistan. Just me, my camera, and a few dozen marines."

She smirked again. "Now my turn." She took a sip of her Scotch. "Military background, for sure. Only got to look at you to see that. But I don't think you're still in uniform, and you don't look too natural in that suit either, although…" She reached her hand inside his jacket and ran it across his chest. Feeling the hard muscle under her fingers she let out just the tiniest gasp, but Casey heard it all right. Outstanding. For a split second their eyes met again and he saw the desire in hers mirroring his own, but then the smirk was back as she discreetly tapped the shoulder holster.

"I saw a lot of guys like you, when I was in Iraq. I figure security contractor - the proper kind, dangerous men in dangerous places doing dangerous things. So how did I do?"

"Close enough." It was a cover he could adopt with very little effort.

"So now we know." She shifted just a little closer to him, and traced her hand across his chest again. "How long are you here in Washington?"

"Couple of days." Casey reached out and ran his fingers lightly along the side of her thigh. He would never have pursued this in LA, faithful to the cover of John from the Buy More, and one hundred percent focussed on the mission, but here in Washington he was could let himself off the leash for a night.

"Same here. Little bit of R&R as you military boys would call it. To be honest, I just wanted to sleep in a real bed and have a shower when not surrounded by thirty men!"

"Unisex showers huh?"

"Oh yeah. I was one of the boys by the end. Morning PT drills and everything."

"Seriously?" He pressed slightly harder on her thigh, picturing her down in the dirt with his Marine Corps buddies, and she tensed the muscles in response.

"Very seriously." Damn, those dimples were hot.

Casey glanced down at their glasses. Almost empty. Time to make the call. "So, what's your plan for tonight?"

"Well, after enjoying a nice long shower when I first checked in…" She paused and he pictured her in the shower, which was probably her intention.

"…I was going to down a Scotch and get an early night." She fixed him with a completely naked look of confident desire and leaned in to murmur in his ear. "But now I'm thinking I'd like you to pin me against that brick wall of a chest of yours, knee my legs apart, and drive yourself into me until I can't see straight."

Casey almost choked on his last mouthful of Scotch as his cock reacted immediately to that extremely attractive proposition. "I like a girl who gets to the point."

"Well, that'd be me." She drew back slightly and smirked again, a disarming mix of cocky tomboy and devastatingly attractive woman. "So, what do you think?"

Casey kicked the door to her room shut behind them, and pushed her straight up against the wall, capturing her mouth with his and kissing her hard. Their tongues stroked and slid against each other, and she tasted of whiskey and something sweeter. He hungrily ran his hands up and down the curves of her body while she pulled at his jacket and pushed it to the floor, exposing his shoulder holster. Without moving his mouth from hers, he removed the holster and threw it onto the dressing table next to them, and she wasted no time pulling his shirt off, losing a couple of buttons in the process, running her hands across his chest with a moan before wrapping her arms around his neck. His hands were inside the back of her jeans, feeling for her ass, pulling her tight against him. Christ, he'd forgotten just how good this felt.

He grabbed her hands and pinned them against the wall above her head for a moment, pulling back from her mouth, giving them both a chance to breathe as he consciously slowed things down, reasserted control over himself. He was so damn close to ripping off her clothes and pounding into her, but he had all night. Still keeping his eyes on hers, he started to open the buttons of her shirt. She was panting slightly, breath catching in her throat as he exposed her upper body, pushing the shirt down her arms, pulling it away and throwing it behind him, taking in the full breasts encased in a plain black bra, and the narrow strap around her waist holding that sheathed knife against her back.

"Don't move." He growled, and she gasped slightly, her pupils dilating. He undid the strap at her waist, reaching round her to carefully take the knife with one hand and unsnap her bra with the other. The knife went on the dressing table with his gun, the bra went over his shoulder to join the shirt. He captured her mouth with his again as he cupped the round heaviness of her breasts in his hands and ran his thumbs over hard nipples. She arched into his touch, and he bent and took a nipple in his mouth, sucking and nipping, as he reached down and unbuttoned her jeans, exposing plain black cotton panties, already slightly damp with arousal.

"Not much call for lace in the desert," She quipped, but there was a tremor under that cocky tone that hadn't been there before. He bit her nipple gently before closing her mouth with a brief, forceful kiss, and then spun her round, pressing her breasts against the wall, her hands above her head, pinning her with his chest. He was still in control, but the edges were fraying again.

He nipped her shoulder, grazing her with his teeth, and then crouched to pull the tight jeans down and expose those amazing legs. He made quick work of unlacing her boots, and those and the jeans were flung away, leaving her in just those black cotton panties. Her body was shapely, beautiful curves and toned muscles. He ran his hands slowly up her bare legs as he returned to standing, and took a firm hold of her hips.

"Like what you see?" She turned her head, but left her hands in place against the wall.

"Very nice." He murmured. "You weren't kidding about the PT huh?"

"No sir!" She was still sparring with him, but he could feel her body trembling and as tattered as his self-control was becoming, he was confident he'd last longer than she would.

He swallowed her laugh in another kiss, and then ran his lips down her neck and across her shoulder. Holding her tight against the wall, he slipped his fingers round to the front of her panties, her soft moan fuelling his desire further as he pulled the soaked cotton aside and slowly slid his finger along her cleft. She was burning hot and so wet he almost lost it again. He gritted his teeth and moved his mouth against her ear, speaking in a voice so soft it was almost a whisper.

"You know what I think? I think you've had to be one of the boys for so long that what you really need right now is to feel like a woman. So I'm going to give you exactly what you asked for." He closed his fingers around the crotch of her panties as she gasped and pressed her hands harder against the wall. "I hope you're not too attached to these," He growled, and yanked them hard, ripping them from her body. He kneed her legs apart and slid two fingers into her, unbuckling his belt with the other hand. She threw her head back and moaned. "Oh god, please, now, please…"

She was unravelling, and it was hot as hell, and Casey knew how to give her what she needed, but he needed it too, God how he needed it, and at the sight and feel and sound of her, he nearly lost control completely. He took a deep breath and let his pants and boxer shorts drop to his ankles, kicking them off along with his shoes. He was so hard it almost hurt.

"Please what?" He pressed her against the wall again, his fingers still thrusting inside her. "You were happy telling me earlier."

"Please fuck me!" Her voice was breathy, full of need.

He thrust his hardness against the soft curve of her ass, suppressed a groan, fought the desire to give in and jackhammer her into the wall.

"That's not what you said before. You were a lot more descriptive."

She groaned, pushing back against him. "Drive into me until I can't see straight!"

"That's my gal," He gasped, enjoying the fact that even half crazed with desire, she could still manage a hint of that disarming smirk.

Wait, fuck, wallet... "Condom?"

"You're good, just do it!" She moaned, and the realisation that he was about to feel her - tight, wet and wanting - around his unwrapped cock tore away the last vestiges of his restraint.

He reached down and held her open with his fingers as he bent his knees and thrust up hard into her burning wet heat. It had been so long, too damn long, that he very nearly shot right then, surrendering to the caress of her inner muscles. But he drew out and thrust back in, setting a hard, fast rhythm, burying himself hilt deep every time, hardly hearing her moans and gasps as he lost himself in the sensation of her tight heat around his cock. He joined one hand with hers on the wall above her head, the other reaching around her, finding that melting spot between her thighs, rubbing in time with his thrusts as she bucked back against him, knowing he wasn't going to last much longer.

She threw her head back onto his shoulder and let out a long keening moan as her whole body spasmed, and Casey let himself go, grabbing her hips tightly as he bucked up into her one final time, spilling himself inside that hot, tight haven between her trembling legs.

He came back to earth, feeling her slump into him, her hands sliding down the wall as he turned her to face him, staggering slightly himself, holding her against his broad chest. He cupped her chin with his hand, tipping her face so he could look into those dark eyes, now velvet soft instead of flashing a challenge.

"That what you wanted?" He managed.

She turned her face against his hand. "Exactly what I needed." Her body felt drained of all energy as she leant against him.

He wrapped his arms around her waist and half lifted her onto the bed, collapsing beside her. They were both bathed in sweat, completely spent.

"Can't sleep," She murmured after a moment. "That would be a waste." Her eyes were almost closed, but her dimples were back in full force. Casey could only muster a grunt in reply.

Suddenly her eyes opened. "God, I don't actually know your name!"

He snorted with laughter. It suddenly seemed kind of ridiculous. "Ca- John, I'm John."

"Nic." She held out a hand, smirking slightly. "Nice to meet you."

He took her hand, then leaned over to kiss her, savouring the taste of her. She opened her mouth and kissed him back, their tongues entwining, lazily this time. Moving incrementally, he closed the gap between them, slipping his arm around her waist as her fingers found their way into his hair.

"I'm so tired." She murmured against his mouth.

"Do you want me to go?" He asked, hoping she'd say no but prepared that she might.

"I'd like to rest against that chest of yours and sleep for a while." She looked so vulnerable suddenly that something constricted in his throat and he had to swallow it down. It should have been a cue to make his excuses, but for some reason, he didn't want to. Besides, what difference would a couple of hours make? It wasn't like they were going to see each other again after tonight.

"Fine with me." He lay back and pulled her against him so that her head was pillowed on his chest, one of her legs slung over his, her hand resting on his stomach. She was soft and warm and it felt unexpectedly good to hold her. He rested a hand on her hair, stroking a few strands away from her forehead. It only took a few minutes for her breathing to settle and slow, and he knew she was asleep. If it had been a long time since he'd last had sex, it had been much, much longer since he last had a woman asleep in his arms. As he closed his eyes, he tried very hard to ignore how good it felt to be touched, to be intimate. It's just the dopamine talking. He'd sleep it off, leave before she woke up, no harm no foul.