COMMANDO
A Lucky Stiff AU
Rated M

Never before has Rick been so glad to wear loose fitting pants. He's been half-hard all night, ever since Kate had changed into a short dress and coat that barely covered her ass and probably didn't do even a remote job of keeping her warm. Not with those bare, mile-long legs.

To top it off, she drives his Ferrari through the streets of Manhattan like she's been doing it her whole life, controlling it like he's sure she could control him in bed.

By the time she takes down a drug dealer in the middle of a busy nightclub without breaking a sweat, he could burst. He just needs a little relief, wants to sneak off to the bathroom, but he doesn't have a chance before reinforcements arrive.

"You coming, Castle?"

Rick jumps, his gaze flying to his partner's. "Um-wh-I-what? Oh," he stutters, telling himself that no, she was not speaking in euphemisms, she was ready to go back to the precinct.

Precinct.

Work.

The case.

Right.

Fuck, he can't even think. There's no way he'll be able to concentrate, especially if Kate drives his car again.

He points toward the back of the club. "Yeah, I just gotta-" He shrugs. "You know. I'll be right back."

Somehow he makes it to the men's room without walking weird - he assumes - or hurting himself, and it's blessedly empty. He almost sprints into the first stall and yanks his pants and boxers down. His erection springs free and he groans in relief, props himself against the side of the stall with one hand and curls the other around his length.

He swipes his palm across the tip, spreading the liquid weeping from it, and begins stroking, his hand a furious blur. Now's not the time for slow, for relaxed. No, he needs to be quick, just needs to take the edge off so he can function and not blow in his pants the second Kate looks at him. He's close, so close, groans when he feels the first tugs of his orgasm, when-

"Castle? You okay in here?"

His eyes snap open and he stares at the stall door. Shit. "I'm almost done," he manages, stilling his hand. "I'll just be a minute."

Kate's shoes appear on the other side of the door for a moment before moving away again. "All right. I'll tell the others to go ahead."

"'Kay." He resumes his strokes as soon as he hears her footsteps recede, and he mutters her name, imagines it's her hand instead of his, her mouth on him. That perfect mouth, it would feel so wet and warm around his-

He doesn't notice that she comes back in, doesn't realize that the stall isn't locked, that the door has swung halfway open, that he groans her name out loud. He's lost in himself, in his impending orgasm, and his hips jerk into his hand.

He doesn't know that she watches him come with a groan, his face turned into his bicep to muffle the sound as he spills onto the side of the stall.

When he finally opens his eyes and sees her he jumps, tugging his shirt down as he stumbles back. "Jesus Christ," he blurts, trying and failing to cover himself. "This isn't-I'm not-" He stops, glances around as he tries to figure out what he's trying to say. He grabs a wad of toilet paper and wipes the stall, his movements automatic and clumsy. "I thought you went back out," he eventually lands on.

Kate's eyebrows lift, but she doesn't move from her spot, just shifts her gaze to his cock. "I heard you say my name, so I came back in after I told everyone to leave," she explains, her cheeks pink, eyes dark. She takes a step towards him, her tongue darting out to wet her lips. "I thought you needed me, I had no idea that-"

"I do," Rick interrupts, his mind suddenly clear. "Need you." He steps forward, meeting her in the door, his hands lifting to frame her face. "I can't stop thinking about you, Kate. Since we kissed-"

She interrupts him with the hard press of her mouth against his, the kiss bruising, teeth clashing as they open their mouths, seeking each other. Rick grips her arms and turns them, pinning her against the wall, sliding his leg between hers. Her tongue finds his and she curls her arms around his back, grips his shirt.

When she sinks down on his thigh he jerks his head back in surprise, his eyes searching hers. "Are you-" He stops, swallows around the lump in his throat.

All of a sudden he's glad he didn't have the thought to pull his pants up. He'd expected to feel fabric, cotton or lace, but there's nothing between his thigh and her, nothing preventing her wetness from coating his skin.

"You're not wearing underwear."

Kate shakes her head as she rolls her hips, her eyes falling shut with a moan. "Took 'em off when I saw-oh." She shudders, and he watches her face as she comes, feels her coat him more. Her eyes flutter open and she meets his gaze. "You saw me before I could touch myself."

Rick slides his hand down her side to the hem of her dress and tugs it up, gives him room to slip his hand between her legs. "You're so wet," he groans, slicking a finger through her. "From watching?"

Kate cries out when his thumb brushes against her clit. "Yes," she gasps, her hands falling to her side, fingers curling around her bunched up skirt. "God, Castle, fuck me."

Rick shakes his head, some of the fog of lust clearing from his brain. "I-are you sure?"

Kate reaches down and wraps her fingers around his length, starts slowly stroking. "We can't go back to work like this," she teases in a low voice, "especially not you."

Rick's head falls back with a groan. This is a terrible idea in a number of ways, but goddammit he wants it so bad he can barely breathe. He grabs her wrist, stilling her movements lest he come to soon, and he can only watch as she glances around and moves over to the row of sinks.

"No condom," he blurts, but she just lifts herself onto the edge of the sink and leans back.

"Pill, and I'm clean. And single," she adds, her breath catching when she slicks her own finger through her folds.

Rick manages to tear his gaze from her center and yanks up his pants so he can move to her without tripping. "Me too. Well, not the pill. But-you know." He tugs her to the edge of the sink, causing her to gasp and grab onto his shoulders for support, and he grips his cock and enters her in one smooth thrust.

Her fingers curl into his shoulders as he moves, setting a punishing pace that has her gasping immediately. Their mouths meet in a hard kiss, and she arches into him, sinks her teeth into his bottom lip when he grips her ass. She soothes the sting of her teeth with a swipe of her tongue, and when his fingers find her clit she cries out.

He can't hold back as she spasms around him and he comes with a shout, his head dropping to her shoulder, mouth open as he tries to catch his breath. She smells like sex and sweat and whatever damn thing she uses that smells like cherries, and he wishes they didn't have to go to the precinct and work, wants instead to take her someplace private and take his time learning her body. Now that he's touched her, been inside her, he wants to explore her.

"We should go," she says a minute later, her voice at his ear, her hands squeezing his shoulders. When he steps back and slips out of her she winces, and he realizes that hanging off the edge of the sink is less than ideal for her.

"Right," he agrees, grabbing a few paper towels so they can clean up a little.

Kate shoves her skirt back down over her hips and she gives him a look that he can't quite read. "I'll be right out. Going to pop into the ladies' room."

Rick nods in understanding, and takes a moment after fastening his pants to examine his reflection in the mirror. He runs his fingers through his hair a few times, but has to pause when it hits him what had just happened.

He fucked Kate Beckett against a sink.

His best friend, his partner, the woman he loves, had caught him jerking off and they'd fucked in a nightclub.

This was absolutely not what he wanted their first time to be like.

He tucks his shirt in, checks one more time that he's relatively presentable, and leaves.

Kate meets him in the short hallway outside the bathrooms, her cheeks still pink, although from what he isn't sure. "Ready to go?" she asks, her voice a little too high pitched to match her casual attitude.

Rick takes her arm when she passes, stopping her. "Hey," he starts, "listen, about that-"

"Later," she interrupts. She presses her hand to his cheek and lifts herself to her toes, meeting his mouth in a tender kiss that's the exact opposite from what they'd just done.

He leans in for another kiss, her lips too tempting, too addicting. "We'll talk," he says when they part and she steps away.

She winks, her lips curling in a teasing smile. "And if talking leads to other things, well…"

Her laugh echoes throughout the hallway as she walks away, getting obvious entertainment from his strangled groan. He tries to think of literally anything else, but his gaze drops to her ass, an ass he swears is swaying more than usual.

God, she's going to be the death of him.

They don't talk.

She shouldn't be surprised that, when he shows up at her door later, hair still damp from a shower, she forgets everything she was going to say, drags him inside, and launches herself at him. He smells of soap and shampoo, his cheeks rough with the day's growth under her palms, and she feels the first pulse of desire low in her belly.

When she reaches for his belt he steps away, groaning when they part. "Wait," he gasps, his eyes opening, his dark gaze meeting hers. "We were going to talk."

Kate shakes her head and grips the front of his sweater. He doesn't wear sweaters very much anymore, not since the early weeks of their partnership, and she wishes that he would. The cashmere is soft under her fingers, almost as soft as his lips, as the caress of his tongue.

"Fuck talking," she breathes before she tugs him back to her, their mouths colliding in a frantic kiss. She finds the hem of his sweater and she drags it up his torso, has her mouth back on his as soon as it's over his head. She splays her fingers over his chest, brushing through the light dusting of hair, smiling against his mouth when he shivers at her touch.

He cups her jaw with his hands, his thumbs brushing over her cheeks in a tender caress as he slows their kiss. "Slow down," he whispers when he lifts his head for a breath. "There's no rush."

Kate slides her hand down his torso to the front of his jeans, traces the bulge there. "I don't think this agrees," she says with a squeeze and a nip at his jaw.

He groans and pushes his hips into her touch, panting as she continues rubbing his cock through his clothes. He stills her movements with a grip of her wrist and spins around, pinning her to the door and thrusting his legs between hers. His hand slips into her leggings and he groans when his fingers encounter her wet heat. "No underwear again? Jesus, Kate."

She chuckles, then throws her head back when two fingers curl inside her. "Oh, God, yes," she moans as her hips roll against his hand. Her fingers dive into his hair and she tugs, brings his mouth to hers in a sloppy kiss. He presses his thumb to her clit and she tears her mouth from his, arches into him with a loud cry as she shudders through a climax.

His fingers slow as she recovers, and when she opens her eyes he meets her gaze and smiles. "That will never get old," he says, pressing his mouth to hers.

"What?"

He trails his lips along her jaw down her neck, nudges the loose collar of her shirt to the side and nips at her shoulder. "Watching you come," he mutters. He lifts his head and pulls his hand from her pants. His hands curl at the back of her thighs and he lifts her into his arms, holds her tight against him. "Bedroom?"

Kate loops her arms around his neck and dips her head so she can kiss his jaw. "Down the hall," she mutters, scraping her teeth along his stubble. "If you drop me, I'm kicking you out."

Rick manages to get them to her room in one piece, and he unceremoniously drops her to the bed. "Nuh-uh," he stops her when she reaches for her shirt. "I wanna do that."

Kate leans back on her elbows and peruses him, her gaze moving down his body then back up, lingers on his groin. "Well, then, you better get to it," she says, licking her lips.

His eyes darken to almost black and he moves over her, straddles her hips with his knees and reaches for her shirt. She hadn't bothered with a bra after her quick shower, and as soon as he drags her leggings off he steps back and stares at her.

She has no reason to be self-conscious, but the way he's looking at her, like he wants to both devour and worship her, makes her squirm. His eyes follow her movements - the man misses nothing - and finally, finally, he runs his palms up her legs, presses gently on the insides of her knees to part them.

Her breath catches when he kneels on the floor and he looks up at her, holds her gaze when he dips his head and runs his tongue along her folds. She can't stop her hips from jerking, or a cry from escaping, but he just presses one forearm to her abdomen, holds her in place as he uses his mouth on her.

There have been countless times in their partnership when she's wanted nothing more than for him to shut up. And she's fantasized plenty about other uses for that mouth, has wondered if his tongue is as talented here as it is with words. As he slides two fingers inside her and uses the tongue in question on her swollen and sensitive clit, her mind goes blank and her vision fills with stars.

He is so much better than she imagined.

Her body trembles with aftershocks for she doesn't even know how long after her orgasm, and when she eventually regains her senses she realizes that he's still between her legs, watching her.

"I love how you taste," Rick grumbles against her thigh, pressing one final kiss to her skin before sliding back up her body.

She can taste herself when she tugs him to her for a kiss, and she buries both hands in his hair as their tongues meet. They kiss for what seems like hours but eventually her desire for his cock inside of her wins, and her hands fall to his pants once again. This time he doesn't stop her, and she unbuttons and unzips his jeans, dips her hand inside to find him hot and very, very hard.

"Why, Richard Castle," she teases, her hand encountering no other barriers, "had I known you were also going commando…" She lets her sentence trail off and she curls her fingers around his length, pulls it from its confines.

He props himself on his elbows as she strokes him, a slight twist of her wrist eliciting a low groan, and when he starts to thrust his hips into her touch she stops, nudges him to his back. As tempted as she is to take him into her mouth and give him as much pleasure as he gave her, she's almost shaking with the need to have him inside her again.

She grips his cock and slides over it before shifting and sinking onto him. His hands grab onto her hips and she leans forward, bracing herself with her palms on his chest as she rolls her hips.

She doesn't believe in fate or destiny or people being brought together by the universe. That's Castle's area. But as they move together, in sync as they are, as he fills her so perfectly, she decides that she'd entertain the idea that they were made for each other.

They find a rhythm almost immediately, her fingers digging into his skin with every drive of his hips to meet her downward thrusts. It only takes a few moments for her to feel the early tugs of orgasm, and she gasps when Castle slides one hand between her legs to tease her where they're joined.

Her hips jerk when he brushes her clit with his knuckle, and she falls forward, her hands landing on the mattress as she cries out. She feels her inner walls spasm around him but he doesn't climax with her, flips them instead so he's on top.

Her legs part to welcome him, and he hooks his arm under one thigh, lifts her leg before sliding home with a loud groan. His hips set a punishing pace, and he slides his hands under her ass, lifts slightly to change the angle.

"Kate," he gasps, his movements becoming more erratic. "I'm close." He sounds frantic, almost panicked, like he's desperate to make her come again.

She loses all sense of time and place, giving herself over to the sensations around her: his low grunts of passion, his hips driving against hers, his cock filling her. Her hand drifts to her clit and she teases it, draws her moisture over it, makes it easier to touch.

His hand joins hers and she arches into him, her breasts crushing against his chest, and as she locks her ankles around his back and shudders she hears him cry out, feels him pulse inside of her and eventually still.

They lie together for a few minutes, a tangle of arms and legs, and once Castle's breath slows he rolls off her, collapses on his back with a loud exhale. "That was incredible," he says, his voice sounding strained. Kate stays silent, and a minute later he chuckles.

Kate turns her head to find him grinning, his hands on his chest and his gaze on the ceiling. "What's so funny?"

Castle meets her gaze, the corners of his eyes crinkling in amusement. "You have a potty mouth," he teases.

"What? No I don't."

"Sure you do." He shifts to his side, props his head in his hand. "When you came, here and at the nightclub. Swore like a sailor."

She opens her mouth to reply, preferably with something sarcastic, but all she can come up with is a "whatever" before she sits up. She winces at the ache between her legs and pads to the bathroom. When she catches her reflection in the mirror while washing her hands she takes a moment to examine her reflection.

Her hair is mussed and there's a large hickey on her neck - at least it's still cool enough for her to wear a turtleneck or scarf for the next few days - and if she looks close enough, she thinks she sees the outline of finger-shaped marks on her hips. Her fingers trace the marks, and she can't help but smile.

God, they're good together.

Castle is still lying on the bed when she returns, and his eyes peruse her body. He pulls himself to a sitting position when she props herself on the edge of the mattress. "So," he says after a long silence.

Kate draws her bottom lip between her teeth. "So." She pauses. "I don't swear like a sailor when I come."

Castle barks out a laugh. "You do," he insists, reaching a hand out to pat her knee, "but I like it. It's charming. And, I imagine, a surefire way of knowing whether you're having a good time."

Kate can't help but laugh at his logic. Considering she'd almost blacked out when she'd orgasmed, he's probably right, not that she'll give him the satisfaction of knowing just how good it had been.

Castle continues. "Of course, this means that when we're at my place, we'll have to make an effort to be quiet. Or only be there when we can be alone."

"Wait." Kate turns to face him. "When we're at your place?"

Castle's eyes turn serious. "I don't intend for this to be just a one time thing, Kate," he tells her, gesturing between them. "I want you. All of you. I don't want to just sleep with you, I want more. That being said," he continues when she hesitates, "I won't push you for more than what you want. If you want to pretend like tonight never happened, it might kill me, but I'll do it."

Kate looks down at her lap, where his hand rests on her knee, and places hers on top. "What if we don't work?" she asks, her voice barely above a whisper. She swallows around the lump in her throat and lifts her gaze to his. "You're the best part of my life," she admits. "If we try a relationship, and it doesn't work, what if it gets weird? Or we can't be around each other?"

"What if we never try?"

She nods and looks back down at their joined hands, squeezes his fingers. "Okay," she finally breathes, her lips lifting into a smile. "I'm willing to give it a shot."

-FIN-