A/N Hi! Thank you for all your comments after the last chapter, I'm happy you like how MerDer relationship is developing. They're going to get only stronger.

Important Note: About this chapter, it contains quite a bit mature content, so if you're sensitive about that, please skip that part!

Enjoy!

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"Hmmm."

Two men looked at each other worryingly. For the last three hours they nervously waited on any frown that appeared on the young doctor's face, any sigh of discontentment, any doubt or query.

When they saw the delicate Dr. Grey this morning, they were already congratulating themselves on signing an advantageous contract; that is, until they got to know her ferocious character. Dr. Grey clearly wasn't a person to be trifled with or taken for granted. She wouldn't rest until she fought the best possible deal for her hospital.

However, the two businessmen didn't learn the reason of her latest concern as her phone rang from her briefcase. With a stony face, she checked the ID of the caller and said, "Excuse me, gentlemen. Urgent call from the hospital."

"Of course, Dr. Grey," breathed hurriedly one of the men.

"Please, take your time, Dr. Grey," assured the other.

She took her cell and went out of the room into the blazing Californian sun.

"Hey, gorgeous," she smiled into the receiver. "Miss me already?"

"That should be my line," Derek's muffled voice feigned indignation. "I didn't disturb anything important, I hope?"

"Not at all," she said lightly. "I'm wrapping up the deal. I gather from your call that the hospital's still standing?"

"The hospital is safe and sound," he quipped. "Nice of you to have no concerns about my wellbeing. That feels good."

"Should I be concerned?" she asked amusedly.

"Yes, I'm in pain, it's ten, I'd say," he groaned.

"Where does it hurt, Dr. Shepherd?" she cooed.

"My heart, it's broken in two since yesterday," he his breath hitched in his chest.

Meredith burst out laughing freely. Since they officially became secret boyfriend and girlfriend, Derek kept turning increasingly cheesy, not that she minded much. She appreciated his attempts at romance, it took none of their passion at all. And she missed him; she came to terms with that fact when she woke up this morning. She missed him even if it was barely yesterday evening when she boarded the plane for Los Angeles where she was to buy new equipment for the general surgery unit.

"A heart broken in two?" smirked Meredith. "Thank God, you're treating brains, not hearts. Otherwise I'd have to fire you. Is there anything else you've got a problem with?" she asked seductively.

"Oh, yes," he whispered. "A very… prominent one."

She giggled and licked her lips. She was thousands of miles away from him but that didn't stop a pool of desire shooting through her core. "Do you think you can last till the evening when I can… attend to your… ailment?"

"I wouldn't entrust it into anyone else's care, Dr. Grey…"

"I should hope so," she murmured. "I am the very best."

"I'm aware of that," he laughed and then confessed soberly, "I miss you, I can't wait to see you tonight."

She bit her lip, "I miss you too."

"Yeah?" he breathed and she could tell he was surprised.

"Mhm, there won't be any sleep tonight, Derek," she promised sweetly.

He sighed excitedly, "Until later, Meredith. Have a safe journey."

She hang up and entered the room back imperiously. "Let's finish this, gentlemen. There's an urgent business in Seattle that demands my personal attention."

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Derek closed his cell and congratulated himself on keeping a playful note in his voice all through the conversation with Meredith. If he didn't miss her presence so much and longed to at least hear her voice, he wouldn't have called because Seattle Grace was one big mess that day.

The day started with an almost flood. Fortunately, the leak in the pipes was detected early enough to repair it without closing down the operating rooms. They learnt that if the failure came to be known just an hour later, water would flow down the corridors and even risk breaking down the ceilings.

Then there were his colleagues who, emboldened by the absence of their chief, tried to present their apparent skills and ranted for hours on end how they would run things differently. Meredith still wasn't accepted by a great number of her subordinates. For example, by Erica Hahn, who seemed decided on outdoing Dr. Grey's bitchiness, with quite pathetic results to Derek's mind. He himself stopped questioning Richard's choice a long time ago. He didn't fool himself; he wouldn't be a better chief. She was ideal for the job; she was born for it and probably raised for it. Having Elis Grey as a mother, it couldn't be different.

Meredith was also a woman full of contradictions, Derek witnessed the proofs of that almost every day since they started their thing, and that was already two months ago. She could be warm, supportive, loyal and faithful but that didn't stop her from turning into a cold… well, there wasn't really another word for it, a bitch who cut with equal acuity and easiness using her cruel remarks as well as with her scalpel. Derek suspected there were reasons for this other than the need to be tough in the surgical world but Meredith didn't let much on. She was giving him little things, he was learning lots of details about her but he felt they were still roaming around substantial questions. He hoped that gradually he'd earn her complete trust. He no longer saw his life without her, which was only proved by their current short separation, insufferable, it turned out, for both of them.

Derek heard the sound of hurried footsteps and turned his head towards the door to his office just in time to see a child in white hospital gown whizz past. He blinked and peeked out on the corridor, almost crashing into a resident.

"What's going on in here?" frowned Derek.

"I… sorry… my patient ran… away," the resident took a few desperate breaths and broke into a run after his charge.

"This place is turning into a madhouse without Dr. Model," Mark strolled lazily with a cup of coffee in his hand.

Derek grimaced involuntarily. Every single one of his colleagues insisted on calling Meredith Dr. Model and it vexed him to no end. She had a body of one, to be sure, he'd know better than anyone but it wasn't her most outstanding quality.

Mark seemed to understand his best friend's grim demeanor quite differently. "You know, I always take what I hear around here with a pinch of salt," started Mark.

Derek let out a sigh preparing himself for another tirade of Mark's. Most of the time, he was laughing his head off at the people assuming he and Meredith were ardent enemies. Not when it came to Mark, though. Derek knew his best friend was genuinely concerned about him. He spent a lot of time at hospital, far more than his schedule required. The occasions he went out with Mark were cut down drastically. He felt guilty for lying to Mark but he couldn't do anything about it. Meredith voiced her conditions loud and clear and he wholeheartedly agreed with her at the time. Derek didn't want to lose this amazing woman for anything in the world. No one was supposed to know the nature of their relations so no one would.

"What now, Mark?" asked Derek impatiently. "We've been over this, over and over."

"Have we?" insisted Mark. "You've been avoiding me for weeks now."

"You're imagining things," shrugged Derek.

"Am I?" growled Mark. "What is it with you and that woman? God knows people are still ranting, but they keep their mouth shut and do their work. And you always jump at her throat."

"I hate Dr. Model," smirked Derek. He wasn't even lying now, he hated that name.

Mark shook his head, "I don't think she wants to fire you, you're too good of a surgeon. But I won't blame her if she does. You must be a pain in the ass for her."

Derek bit his lip not to burst out laughing.

"Take it easy man, she's not that bad. She might've stolen your job but she's a hottie," Mark wiggled his eyebrows.

"I thought you were after Dr. Montgomery," gritted out Derek. He hated other men even looking at Meredith. And unfortunately, that happened alarmingly often.

"Oh, I am," chuckled Mark. "She's playing hard to get but she'll surrender soon enough."

Derek snorted, "I think she surrenders when you surrender your nurses." From what his secret girlfriend told him, Addison was waiting for him to mend his free ways.

"Whatever," dismissed him Mark. "Hey, you want to go to Joe's tonight?"

"Can't," Derek smiled to himself returning back to his office. "I'm busy."

Mark looked at him suspiciously but gave up seeing the red-head doctor appearing in the corridor.

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George picked up the tray with his eagerly awaited lunch. He was dead on his feet and the end of his shift seemed as distant as next Christmas. He was by now more or less accustomed to taking control in the hospital when Dr. Grey was not present but today was a completely different story. The knowledge that their Chief was on a business trip in another state seemed to let everyone loose. It cost him inhuman effort and countless battles with his colleagues to preserve the smooth running of the surgical floor. He was exhausted and hoping the meal to bring his strength back.

He was about to put his tray on the table in the cafeteria when Alex threw himself heavily in the chair without a word, taking big gulps of mineral water. He was followed by Izzie and Cristina who arrived with their food.

"I'll find another table," mumbled George under his breath and made to march off.

"George," Izzie stopped his hand. "Come eat with us."

He blinked at her and asked sarcastically, "Oh, it's George now? Not Dr. Model's lapdog or slave?"

"You still are," drawled Cristina, "but we're no longer angry at you for that."

"Great," snorted George. For two whole months he was forced to suffer their jeers and the loneliness they imposed on him and, now they were here at his side as though nothing had happened. "Maybe it's me now who's angry!"

"George, I'm sorry," pleaded Izzie. "We're all sorry. Right, guys?"

Alex just rolled his eyes while Cristina muttered opening her sauce, "Yeah, yeah, we were selfish and childish."

"I'm really sorry," Izzie went on. "Will you forgive us?"

How could he not? George deposited his tray down, took the seat wordlessly and started to devour his lunch.

"Tough day?" smirked Alex.

George only shrugged and chewed on his food.

"You're doing a great job," smiled at him Izzie.

"You don't need to suck up," said George trough his full mouth.

"She's not sucking up, she's telling the truth. Surprisingly enough," commented Cristina sincerely. "So, how's it going, the work with Dr. Model?"

"I wouldn't stand waiting on her bitchy moods," Izzie rolled her eyes dipping the fries in ketchup.

"I would," interrupted Alex with a grin. "One look at her assets makes up for her charming character."

"She's not bitchy," denied George indignantly. "She's kind and smart, and funny…" he trailed off noticing the furtive smirks and glances exchanged between their friends. "What?"

"You're so- Ouch!" Alex was kicked on the shin by Izzie.

"You like her, don't you?" she shot him a shrewd look.

"Of course, I like her," he shrugged continuing with his food.

"Dude, you have hots for her," Alex looked at him pityingly ignoring Izzie's glares.

"I… I don't!" George denied quickly, blushing furiously.

"You kinda do," nodded Cristina.

"I don't! She's my boss, she's all of our boss!" stammered George, shaking his yoghurt.

"If you say so," shrugged Cristina. "She's out of your league anyway.

"She's probably taken," added Alex. "Women like her don't like to be lonely."

"What? She's… she's not," George shook his head. "I would know, I work with her all the time!"

"Whatever," threw Alex disinterestedly.

George got lost in thought. Dr. Grey was a beautiful woman, when she walked all men, and some women, on her way stared only at her. Why would a woman like her be alone? But he would know, he assured himself; he would know because he saw her work at the hospital from dawn till dusk and even longer. When would she have the time to be meeting someone?

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"I hate to say this," breathed out Cristina joining everyone at the nurses' station, "but I can't wait when Dr. Model gets her little ass back here and shows Hahn her place! Who does she think she is? I'm a freaking attending and she treats me like her private bitch!"

Derek bit back a laugh studying his colleagues' tired faces. Though O'Malley was doing all in his power to keep the hospital under control, the absence of Meredith's strong character and discipline she so effortlessly maintained, was palpable, making some try too much and others slack. Everyone more felt it than consciously admitted but she became an important part of Seattle Grace.

"She's coming, Dr. Grey's coming," a nurse hurried to the counter and made frantic attempts to make it look clean and tidy. She hastily gathered the charts in an even row and threw a half-empty coffee cup in to the bin while everyone straightened up and smoothed their lab coats.

Soon enough, they heard quick clicking of high heels, a infallible sign that Dr. Grey was approaching.

Derek's heart beat faster as she appeared from around the corner, still clad in her formal clothes with a little briefcase swaying in her hand, her blond locks jumping with every energetic step. God, didn't he want her… Barely twenty-four hours passed since he last saw her, a little more since he last had her, but he could never drink his fill.

"Good evening," she said and breezed away, not gracing them with one look.

"Good evening, Dr. Grey," they answered in a slightly uneven choir.

She stopped in her tracks abruptly, whirled around on her heel and slowly made her way towards them, narrowing her eyes suspiciously.

"Did anything interesting happen when I was gone? Something I should know about? Any problems?" she asked as her searching eyes swept from one face to another.

"No!"

"Yes!" came two contradicting answers and they fell into an uneasy silence.

"Hmmm," she halted between Mark and Cristina and flashed a smirk at Derek. "I heard you had some troubles, Dr. Shepherd. Like you always do."

He squinted at her, little tease. She could make him hard just by her remarks and she knew it.

In the meantime, the thoughts of others were going in a completely different direction. If Dr. Model was so well-informed of the situation in the hospital, she had to have a spy who sent her reports on everything and everyone. All eyes obviously turned to George, who shook his head gently.

"And how was your trip, Dr. Grey?" asked Mark with a charming smile. "To your advantage, I hope?"

"Of course," she snorted. "I wouldn't have flown all the way to Los Angeles if I hadn't been sure it would. And now, ladies and gentlemen I can announce that Seattle Grace is the proud owner of the Da Vinci s.i.h.d. surgical system."

Derek watched his colleagues' eyebrows rise in awe.

"Oh no, you didn't!" Miranda Bailey… giggled like a girl. "You bought us a Da Vinci?"

"Oh yes, I did," smiled Meredith. She threw Derek a saucy grin and marched off, providing answers for Bailey's fervent demands for details.

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"Here you are, Dr. Shepherd," Meredith's voice made him stop and turn around to face her. "I've been looking for you."

He quickly looked around and seeing they were all alone in the corridor, took her in his arms reveling in her body and planted his lips over hers. However, before she could deepen the kiss, he already pulled away. Damn it, he yearned for her and he didn't have the time.

"Sorry, I have an urgent case," he sighed. "40-year-old male, creeping paralysis of an unknown cause."

"You're cutting blind," she stated knowingly. "Sounds like a long procedure."

"Yeah," he gazed at her longingly. "Want to give me a hand? I'm sure will finish quicker together."

"Sure," she smiled. "I'll be down in the scrub room in five minutes.

Some two hours into the procedure, Derek began to regret inviting his girlfriend over because apart from concentrating himself on finding the origin of his patient's ailment, he had to fight with his own body. He didn't want to check what it was like to work with a hard on.

Never before had an OR looked so… porny. With Meredith across the table, every gesture and every word acquired a double meaning. It seemed to be another of her natural talents, though he was sure the majority of her antics were deliberately targeted to make him hard and panting for her. Not like she had to make much effort to achieve it anyway.

After a two-hour search for what Derek believed was a clot, the two of them, working in their respective areas, didn't find anything. Still, the work was much quicker than what it would have been if he had to cut alone or in assistance of a resident.

"Are you sure all the scans and test results came out clear, Dr. Shepherd?" asked Meredith sharply from her place.

He saw the nurses flashing at her indignant glares but he wasn't affronted. The mischievous twinkle in her green eyes told him she had one thing on her mind – setting him off; angry passionate sex never failed. To tell the truth, any other didn't either.

"Aha, got it," Derek breathed out with relief. He didn't know how long he would last without abandoning the patient and lunging himself at his girlfriend. He was starving for her.

Meredith moved to help him and they finished their work in no time. They worked in a complete sync, as Derek noticed contentedly.

"It was a pleasure to work with you today, Dr. Shepherd," she said when they washed their hands, scrubbing out.

"Likewise," he whispered and stared at her lips. "Though, I daresay, the pleasure will continue."

They looked into each other's eyes and felt a dame break. The short separation, the few hours spent together in the OR, the surgery high… they needed to have each other or they would go mad with desire.

Meredith threw away a crumpled paper towel with impatience and stormed off, giving him fiery looks over her shoulder, ordering him to follow. She wanted to make it to her, or at least his, office but after a few steps her resolve melted. She stopped and pushed him into a supply closet. She kicked the door close and blindly reached for the light switch, the lamp kept flickering giving out a weak illumination.

"Wow, we even have visual effects," he chuckled looking mesmerized into his lover's eyes as she closed in on him as though readying herself to pounce.

"Who said we need more of them?" she muttered and tugged violently at the hem of his scrub top dragging it over his head leaving it deliciously messy.

"Now, Dr. Shepherd," she purred raking her hands over his hard chest. "We spoke on the phone today. I'm Dr. Grey and I'm here… to take care of your problems."

He chuckled feeling increasingly turned on and hard; they never played doctors yet. His laugh transformed into a moan when her lips descended on his chest, kissing him and licking with her hot little tongue.

"You… complained about your heart… I believe," she panted between each nibble on his skin.

"Mhm," he hummed and gripped her waist but she swatted his arms away.

"That's not very professional, Dr. Shepherd," she murmured. "Let me do my work."

Her skillful mouth closed on his left nipple and he grabbed the shelf to occupy his hands somehow, letting his vixen take control of his body and mind.

She lapped languidly at his flesh, bit and sucked, making his nipples and other part of his body harden painfully.

"There," she breathed soothingly at his chest. "All healed… Now… your other ailment…"

His breathing became increasingly difficult, as he waited with eagerness and anticipation for the next phase of her treatment. She smirked up at him, slowly lowering herself, her lips trailing a hairy trail down to his pants. He thought he was going to explode as her fingers lazily untied the cord. Then, she pulled down his pants and boxer briefs in one swift motion and cooler air hit his lower body, making him strain even more.

Her palms slid from his waist, over his firm ass to the back of his thighs and he watched her smiling mouth reach incredibly slowly towards his hard member.

She looked up at him wickedly with her heavy laden eyes. Her lips curled into a letter O and she blew a little on his sensitive tip. He swallowed back a moan; she was on the best way to drive him insane. One more minute of this torture and he'd lose control and grab her head to thrust into her moist cavern.

She must have taken pity on his internal struggle as her pink tongue sneaked from her mouth and licked the liquid that dripped from his opening. He couldn't block an uncontrollable groan that escaped him at the feel of her. He kept panting and growling, his breath hitching in his chest, as her skilful tongue glided all over his cock, from the base to the head, not pausing for long in one place.

One of her hands left his thigh and moved between his legs to fondle his balls. He jerked slightly forward, trying to stop himself from thrusting. God, he longed for release. She then took as much of him as she could into her throat grazing his skin with her teeth and all his self-control flew out of the window. He pushed a few times and erupted into her mouth with a roar, throwing his head back and hitting the shelf. She wallowed and licked every drop of him clean and stood up admiring her job.

"How… was that, Dr. Shepherd?" she panted. "I believe my therapy proved effective?"

He cracked his eyes open but one look at her swollen lips was enough to prevent him from forming a coherent thought.

"I… a…" he gulped heavily.

"My, my," she shook her head with a grin. "There are side effects, I see. Complete loss of the ability of speech. I must take care of that immediately."

Her lips landed on his and he tasted himself on her. He seemed to snap out of the haze and kissed her with abandon, pressing her to him as tightly as he could. He needed to come inside her again, this time in a different place. He didn't possess patience enough to undress her. He dived his hands under her top and dragged her bra down to grab her breasts roughly. She elicited sweet moans into his ear, tugging at his raven locks and driving him wild. His fingers insinuated themselves underneath her pants and pulled down exposing her butt when suddenly… the door burst open. They blinked with disorientation. The supply closet was much darker than the corridor and in their porny trance; they could only make out a blur of a silhouette that halted at the entrance. Before they were able to react in any way, the mysterious person quickly backed out, shutting the door.

Meredith sprang away from him with a yelp, readjusting her cloths and her hair.

"Meredith?" he panted searching her eyes with dread, getting dressed at the top speed as well.

She shot out of the closet but the corridor was silent and empty, not a living soul around…

She paced in the spot, rubbing her forehead absent-mindedly.

"Meredith," said Derek joining her and grabbing her arms.

"Did you see who that was?" she asked firmly.

"I… no." he shook his head with a wildly beating heart. "Meredith-"

"Not now!" she barked out and marched off without a second glance.

He let out a deep exasperated sigh and banged his head against the wall. He had no physical or mental strength to swear; it wouldn't bring any release anyway.

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A/N Any ideas on who that might be? As always I'm waiting for your opinions and suggestions!

Em :)