A/N: This will likely remain the only piece of smut that I'll write for a good long while – I just keep feeling like someone is going to burst into the room and try to see what I'm doing, and it really throws me off my game. Hell, I typed most of this in hours past midnight, hiding under my doona because I was so paranoid about it.

That being said, I hope you enjoy it!

.:':. .:':. .:':.

York looked up in surprise as Carolina stopped by his door, clad in a tank top and sweatpants. She smiled at him. "Hey. Can I come in?"

"Sure." He nodded his assent, sitting up on his bunk as she strode into the room. The door closed behind her with a muted swish. She glanced around the room before settling her gaze on his desk, grabbing one of his lock-picking books. She raised her eyebrows as she flicked to the first page. "I didn't know you could pick physical locks as well as digital ones, York."

"I'm a man of many talents." Grinning easily, he laced his fingers together behind his head. York enjoyed flirting with Carolina. Even though she constantly rebuffed his advances, he knew she was going crazy for him.

True to form, she rolled her eyes at him. "It'd be more impressive if you could open a lock in the field without triggering some sort of alarm."

"Hey, I already told you. Those weren't my fault."

With a graceful movement (and another eye-roll), she folded herself up and sat on the edge of his bed, hand sliding gently down the page as she began to read. "Typically, in pin-tumbler and wafer-tumbler applications, a lock in the rest position is closed. The key has a series of grooves on either side of its blade, which limit the type of key the lock can slide into. As the key slides into the lock, the grooves on the blade of the key align with the wards in the keyway, allowing or denying entry to the cylinder..." Her voice was low, almost husky, and York shifted his legs up as he became aware of the front of his pants tightening. She had punched him hard enough to bruise when he'd asked for a good luck kiss before a mission, what would she do if she discovered she was giving him a hard-on? What was she even doing in here, reading him one of his lock-picking books anyway? Why was he only just now realising that texts on picking physical locks were just one big goddamned innuendo?

It hit him when he saw the slight smirk curling her lips as she glanced at him from under her eyelashes.

Holy shit she's doing this on purpose.

She seemed to sense he'd reached this epiphany, because her smile grew wider and she stopped reading. "Have you got something to say, York?" Her tone was somehow both innocent and sultry.

"Just that I hope you don't punch out my good eye for doing this," he replied as he leant forward and kissed her.

Carolina's lips moved instantly against his, which he took as a sign that his vision was safe. She slid the book onto the desk behind her before climbing forward, pushing him up against the wall and straddling him. His hands seemed to move with a mind of their own, his warm, calloused fingers creeping underneath the back of her shirt, tracing the smooth column of her spine. Quickly gaining confidence, he pushed the fabric up further. She lifted her arms and he pulled the shirt free, unceremoniously tossing it onto the floor.

He couldn't help the grin that stretched across his face when he saw her bra - a rather appealing combination of lace, silk and deep turquoise. "Been planning this for a bit, have you?" She glared at him and opted out of answering by way of pressing their lips together once more, her hands curling around his shoulders. Her mouth was hot and earnest against his, and it wasn't as if he was going to deny her anything that she clearly wanted. His lips parted, tongue darting out and tracing the curve of her cupid's bow.

They both knew York had more experience in the field of making out, Carolina easily letting him take the lead. That wasn't to say she had relinquished control of the situation - she was still in charge, deciding exactly what rate their pace was going. Not that York minded much. She obviously wasn't taking the slow and steady approach, if the way she was gracelessly tugging his shirt over his head was any indication. Their lips crashed together again, teeth narrowly avoiding clashing. York's fingers skimmed along the gentle curve of her back, lingering at the dimples just above her hips. Emboldened, he slipped his hands down further and squeezed her ass. She pulled away, resting on her elbows and digging into his chest maybe a little bit on purpose. "Someone's feeling assertive today."

York grinned and moved his hand up to the back of her head, pulling her hair out of its perpetual ponytail. The loose strands cascaded around her shoulders. "You should let your hair down more often. It suits you." The double meaning of the phrase was not lost on Carolina, but she played along anyway.

"It gets in the way enough already," she replied, unsuccessfully trying to toss her fringe out of her eyes. "Sometimes I just feel like grabbing a pair of scissors and cutting it as short as CT's."

His gaze turned serious. "Don't you dare. I like you just the way you are." And with that sentiment, he started kissing her again. He deftly unhooked her bra, the material falling easily from her arms and onto the floor, joining her discarded tank top.

Another smirk drifted across her face. "If only you could work that quickly in the field," she mused.

"Hey, I can either be mocked, or kissed. You can't do both at the same time."

"I'm not sure about that. I've always been a bit of a multitasker-" she cut herself off as York took one of her nipples into his mouth, tongue swirling and flicking until it hardened.

"Or you could mock and I could kiss, that works for me too," he murmured, hot breath ghosting along her chest. She arched into him and he chuckled, one hand snaking up to cup her other breast, the other toying with her waistband.

He briefly considered rolling them over just to see her spread out beneath him, but decided against it, knowing they would likely fall out of his bunk. It was just as well that the bed was too small, really - she probably would have put him in some sort of jujitsu headlock out of pure instinct if he'd tried it. Instead, he settled for sneaking his hand below her waistband, gripping the firm skin of her buttocks with a cheeky grin.

Not to be outdone, Carolina rocked her hips against his, grinning triumphantly as he twitched and stuttered below her at the unexpected friction. He tried to say her name, but most of it was swallowed in an embarrassingly breathy moan, leaving only a strangled "'Lina." York immediately decided he liked the nickname. "God, 'Lina, you're so damn beautiful."

Later, York would wonder how she managed to work her way out of her pants whilst still straddling him, but at the time he was more preoccupied with the fact that he was in bed, naked, with a gorgeous woman who was as into him as he was into her.

She smiled lazily at him, curled into his side and not seeing any need to cover herself up in her post-coital bliss. York had a wide grin plastered to his face and an arm hooked around her shoulders, tracing slow circles on her back with his thumb. "That was fun," he told her, humour dancing in his good eye. "We should do this more often."

Her teeth flashed as her smile widened. "I guess it couldn't hurt to let my hair down every now and again."

"I'd like that," he replied softly. She kissed his jaw affectionately, then sighed.

"I should probably go. I've got a training session with North soon, it'll look suspicious if I turn up late."

He held her tighter. "I don't know, I'm quite comfortable like this. Do we really have to keep it a secret?"

"You know the protocols about intimacy between agents."

"Protocol?" He snorted. "Don't you go turning into Wash on me. You're far more attractive."

"York..." she growled warningly.

"Okay, I'll try."

"And if you go boasting about this, I will make you regret it in our next sparring session." She punched him playfully in the side for emphasis.

False innocence oozed off of him. "Me? Boast? I would never do such a dishonourable and egotistical thing." Carolina raised one eyebrow sceptically.

"Has anyone told you you're a terrible liar?"

The virtuousness melted into something far more devilish. "Then you know I'm telling you the truth when I say I want you for the rest of my life."

She swatted at him. "Down, boy." With another wistful sigh, she began gathering her clothes from the scatter pile strewn around the room and putting them back on. "I really have to go," she told him, the tone of her voice saying she would really rather do the opposite.

"So, I'll drop by your room the same time next week?" he asked hopefully.

Carolina finished retying her hair, her mouth quirking up as she headed for the door.

"Surprise me."