AN: Thank you for all the love for this drabble collection! It's hard to start a new story but I'm so happy to see some of my regulars pop in as well as some new faces :) I can only say "Welcome" and I hope you'll enjoy!

Another written for Klarodrabblequest blog, based on this prompt (NSFW):

"Klaus is a professional trainer and Caroline is in need of one. They have sessions 3 times a week and one time, when they're alone in the gym things get sweaty and heated and smut ensues."

One thing was certain. Caroline was going to kill Kol.

Seriously, she had never hated a human being more.

Not true.

Klaus Mikaelson easily took that spot.

Especially now, when she was falling way behind him, every single one of her muscles burning as they jogged on what he deemed a "semi-rough trail for amateurs".

"Do try to keep up, love, we don't have all day," he called out, his tone annoyingly cheerful.

He was a freaking sadist, that's what he was.

Okay, so he owned one of the most exclusive security agencies and was basically a master of martial arts. Big deal. It didn't mean he had to be the one responsible for her pre-filming training.

Caroline had never been happier than the moment she got a call from her agent telling her that she'd won the role in the new Black Widow series – she'd be playing none other than Natasha Romanoff herself. With Kol Mikaelson, the young up-and-coming director, and a stellar script that she'd gotten a glimpse of, it would be a certain hit. However, her enthusiasm had subsided substantially since she'd gotten to know her new personal trainer.

That had been a total disaster.

There was no denying that Caroline had been excited to meet the person she would be training with for the duration of the upcoming month. She had even prepared a list of areas she thought she would need to improve, as well as her physical strengths and suggestions for a training schedule.

Caroline Forbes was nothing but thorough.

All she had known about her professional trainer was that, apparently, he was Kol's brother and as a favour Klaus had owed to his younger sibling, he'd agreed to get her into shape before they started shooting. Oh, and he had the weirdest name.

Klaus, really? What had these Mikaelson kids done to their parents to deserve their names?

Unfortunately, upon meeting him, Caroline discovered that he hadn't been as enthused by the prospect of them working together as her. On the contrary, he'd been nothing but aggravating and condescending, completely disregarding all her suggestions and imposing his own punishing workout regime.

Caroline had always considered herself relatively fit and quite flexible (thank you, yoga) but after two weeks of hell, courtesy of Klaus Mikaelson, it seemed he had proven her wrong.

And she hated that.

She hated showing up at his mansion – where she had to go because he'd claimed his private gym was equipped far better than anything the studio could provide.

It must have been true, given how much it resembled a torture chamber. Every day was filled with gym, stretching, combat training and… running. Caroline detested running. And Klaus forced her to do so outside in the forest surrounding his house, instead of on the treadmill like a normal human being.

It totally didn't help that while she was lagging behind him (and let's be honest, most of the time she was), she was treated to a delectable view of his perfectly muscled calves and ass. Which was highly distracting and had caused her to struggle for a breath on occasion.

"See something you like?" Klaus rasped in her ear as he slowed down to level with her.

Damn, he'd caught her staring.

Good thing that she was probably so flushed from exhaustion he wouldn't be able to spot her blush.

With a glare, its potency partly abated by her strained voice, Caroline panted, "Can't say that I do."

Also not true.

Because, as much as she tried repressing her reactions, Caroline couldn't help but notice.

His perfect, kissable lips. Late afternoon scruff. The way it would scrape against her shoulder blades whenever he hovered over her and fixed her posture or positioning. His warm hands on her body; gentle but firm, and his breath dancing on her skin.

Did she mention it was distracting?

And the worst part was, as much of a prick as Klaus was, he also cared. As much as he taunted her and tried to boss her around, as much as he pushed her limits and tested her patience – he also had this irritating knack for sensing her moods and being quite thoughtful.

By making sure she drank enough, ate properly, or that she was sufficiently warmed-up not to sprain a muscle – he went over and above on it all, even texting her to remind her to take care of herself.

He made her melt a little on the inside, and that was without all the tingly sinful ideas his potent gaze implanted in her mind.

And with the way his eyes would often linger on her, darkened with lust whenever he got her pinned to the floor; or how his fingers would trail over her skin for just a little too long – Caroline knew he must have shared at least some of her ideas.

"If you say so, sweetheart," he actually winked at her, glee dancing in his pale blue eyes.

"Could you be anymore full of yourself?" she asked gruffly, trying her best to mask how strained her voice was from running and talking simultaneously.

Determination to succeed was stronger than any animosity she felt towards Klaus. This TV show was the grand opportunity she'd been working for and even if it was the last thing she would do, she would get in shape to shoot all the action scenes. Plus, why give her trainer straight from hell satisfaction by letting it show just how exhausted she was?

Speeding up again, Klaus shifted and started leisurely jogging backwards.

"You fancy me, Caroline. Admit it."

His smug tone spurred her to run faster, it infuriated her so much.

"I do not!" she yelled after Klaus, shifting to sprint with the last of her strength to catch up to him.

His laughter rang in her ears as they raced towards his mansion and she couldn't help but chuckle too.

They charged past the door, both of them still laughing through their heavy breaths.

Leaning on opposite sides of the corridor, Caroline tried to inhale slowly and get her pulse under control, her heart seeming keen on beating out of her chest. She could feel Klaus' focused eyes raking over her form, her skin prickling with awareness.

Her gaze flickered to his and silence fell between them as their laughter gradually died down. Something in the air shifted and suddenly, Caroline was aware of every single inch of her aching body.

And her body was aching – to be touched.

Instead of his gaze, she craved to feel those firm hands stroking her from head to toe.

Dammit.

Klaus leaned towards her and she licked her lips, drawing his attention to her mouth. They stared at each other silently and she could almost hear the blood pumping in her veins.

After what felt like an agonizingly long time, his head tipped forward, in what Caroline was sure to be an attempt to kiss her. She held back a breath, as if afraid to move at all and ruin the moment.

The cell ring did it all on its own.

Klaus seemed genuinely startled, a flicker of disappointment flashing on his face

Before answering the call, he murmured, "Gym in 10 minutes. Don't forget to stretch, love. Sparring is next."

Watching his back as he retreated further into the house, Caroline refused to think about why she felt like such a shaking mess.

To be honest, when she entered the gym, Caroline was dead set on working out her frustration via exercise. But as soon as she walked into the small locker room and her back hit the bench, she found herself unable to move, sprawled shamelessly on a wooden surface.

"Working hard, I see."

His mocking voice shouldn't stir tension in her lower belly but it did.

Not bothering to stand up, she merely peered up at him.

"I don't think I'll be going anywhere anytime soon."

A look of concern crossed his face and he hurried towards her, settling on the bench next to her wobbly legs.

"You should've told me it was too much for you," he said quietly, a tinge of guilt in his voice.

Caroline shot him an incredulous glance.

"Klaus, we've run like, for 10 miles. It's kind of obvious it's too much for a normal human being," she deadpanned.

"It was closer to 5, but if exaggerating makes you feel better, I won't argue," he chortled, his gaze turning tender all of a sudden.

Her breath caught but she quickly shook it off.

"You kinda just did. And what would make me feel better right now is a massage, a mojito and a warm bath."

"Well, I believe I can accommodate you with all three, but how about that massage first?" Klaus offered and then added, noting the clear look of disbelief on her face: "It's the least I can do, being half-responsible for your current state."

Her eyes shot up defiantly. "Only half?" she teased.

"You should've told me you were tired," he grew serious, his tone stern, almost possessive. As if he was angry with her for overexerting herself.

A shiver went down her spine, her legs quivering but not solely from exhaustion anymore.

"May I?" he motioned towards them in question.

"Be my guest," she managed, her throat unexpectedly dry.

He started with her feet, fingers pressing into the soles, not too hard and not too gentle, but exactly right, working her into sweet oblivion. Teeth sank into her bottom lip so as to hold back a moan.

Slowly, oh-so-tortuously slowly, his hands moved up, running along her calves. Observing him from under her eyelashes, Caroline watched how the tip of his tongue nibbled on his raspberry mouth as Klaus appeared to be entirely fixated on bringing relief to her muscles.

Perhaps he could feel it, because he glanced up, his intense stare matching hers.

The room was sizzling, burning with tension, and it got utterly too hot between the two of them.

Still, she didn't want it to end, however reckless it seemed. Almost lazily, she propped her upper body on her elbows, her chest jutted forward, and cast him a look charged with challenge.

Doing the trick, it spurred him on further, his hands skimming higher up her legs as he palmed her thighs.

Except now, he wasn't looking at her body. His eyes never left hers.

His eyes never left hers when his fingers carefully kneaded every inch of her thigh, starting just above the knee; from the outside to the front. His gaze remained fixed on her as his hands leisurely wandered to the inside, patiently applying pressure.

Moving up. And up. And up.

Her breath hitched, goosebumps covering her skin, and Caroline could very distinctly feel just how damp her panties got.

As if out of reflex, she parted her legs wider, with feet falling on either side of the bench.

Klaus' gaze turned feral in response. Delving under the hem of her running shorts, he started drawing circles on the soft milky skin there.

Her chest was moving up and down rapidly as his fingers inched higher and higher. She fought the urge to clench her thighs and trap his hand exactly where she wanted it.

"Caroline?" His hoarse voice cut through the haze she was in.

They both knew what he was asking.

"Yes," she croaked wantonly, pushing her hips against his hand.

It seemed it was all he needed to go on, his eyes set ablaze with lust. In one swift move, he yanked down her shorts and underwear, then nestled between her legs.

Running his fingers over her slit, he revelled in what he found.

"So hot, swollen and wet, sweetheart. And all of it for me, isn't it, Caroline?" he rasped with his thumb on her clit.

"Yes."

"Do you know how difficult it was, to watch your tight pretty arse bend in those little shorts?" he mumbled huskily. "How bloody hard I was each time you managed to pin me down to the floor?" With each sentence, he pushed his fingers deeper and deeper between her silky folds, rubbing her clit furiously at the same time. "I spent nights imaging you wrapping your lean milky legs around my back, with my cock buried deep inside you."

"Oh," Caroline whimpered, his words making her core throb in anticipation as the images he painted filled her mind. "Klaus…"

If it was possible, his eyes darkened even more. "What do you want, Caroline? What do you need?"

She licked her lips, mulling over the question, and his gaze followed every move.

"Take off your shirt."

The clear demand colouring her tone coiled arousal down his body. Breaking the eye contact for only a few necessary seconds, he slowly pulled off his shirt and cast it away.

The sight was mouthwatering. He was slim but toned, subtly muscled. There was also a tattoo that she'd gotten glimpses of before, stretching from his taut shoulder to his left pectoral. She wanted to lick all over it.

Her gaze flickered from the sublime V-line down his abdomen down lower; to the visible bulge in his pants then back to his face.

The smirk she found there told her that Klaus was quite satisfied with her ogling.

"Pinch your nipples for me," he instructed, all honey and silk with a taste of steel, while his thumb brushed against her clit once more.

Caroline obeyed, tugging down her top and bra to expose her breasts.

Her nipples were already stiff with arousal when she encircled them with her fingers. Head tilting back, a low hum resounded in her chest as she kept playing with them, scraping and pulling and rubbing.

"Stroke your cock. I want it big and hard for me," she moaned, hips rolling under his hand.

His movements stilled but he obliged, his gaze burning through her skin as his fingers darted to his sweats and pulled them down enough to free his growing erection. Slightly unsteady, his hand closed around it, a hiss getting through his teeth.

Her mouth watered even more at the sight.

"I need you inside me, Klaus," she uttered and a pang of hunger surged through his body at the brazen want in her voice.

"Come here."

He sat astride the bench and she scooted over, bracing herself on her arms, back arched forward.

Hooking her legs behind his back, he took hold of her hips and impaled her on his length. Caroline gasped at the intrusion, the friction of his cock against her walls spreading heat in her lower body.

She felt so full and deliciously stretched, but she needed more.

Klaus had a different idea, setting a painfully slow rhythm, his eyes raking over her frame – bare but for a top and bra bunched up below her breasts, her flat stomach carved with subtle muscles that danced sensually as she swiveled her hips to meet his.

"You look glorious, love, so greedy and exposed, all for me. What shall I do with you now?" His tease ended in a guttural groan when she clenched her pussy around him in response.

"Fuck me…" she gritted her teeth, "Harder."

"Oh, I will." A wicked promise simmered in those dark irises. "I will make you come for hours," he whispered in time with a deep long thrust, eliciting a loud cry deep from her throat.

"Harder," she managed once more, her arms shaky under her weight as she used all her strength to meet his moves in reckless abandon.

Klaus shifted, scooping her into his arms so that she'd straddle him.

"Minx," he growled into her ear at the change of angle, her pussy taking him even deeper down.

His fingers trailed her spine and hers sank into his curls, a little damp from the sweat.

Caroline rode him frantically, her hard nipples grazing against his chest, his hands skimming lower to dig into her hipbones and slam her harder onto his shaft. His moan brushed against her clavicle and she bit into his shoulder to stifle her own as his thrusts grew longer and rougher.

He whispered against her skin, pet names and sweet nothings and all the dirty things he wished to do with her and when his fingers darted to rub her clit, Caroline fell apart, trembling uncontrollably as she went over the edge.

The spasms of her walls tipped Klaus over the edge and after bucking his hips a few times, he shuddered under her.

They stayed joined like that for some time as their breathing evened out, secretly content with the intimacy of it.

Caroline could feel a lazy smile forming on Klaus' lips as he adorned her chest and neck with warm butterfly kisses, her fingers pulling on the hair at the nape of his neck.

"That was worth at least a week's workout," she murmured dreamily, only half-joking.

Klaus' eyes flickered to hers and the devilish spark in his gaze told her all she needed to know.

They'd be getting far more than a week's worth done, alright.

Thank you for reading :) How did you like this one? Something you particularly liked or didn't? I'm always hungry to read your thoughts, haha. Also, my inner Marvel geek is coming out because how awesome it would be to have Black Widow TV series, right? And just imagine, starring Caroline Forbes - perfection!

Till next time,

Kate