Disclaimer: Nope. Not me. Cause Shonda has the cast over for her birthday. Or at least that's how I imagine it. Me? The only thing I got to see of Grey's on my birthday were a SGH mug and Season 2 soundtrack. Oh, but there's a new episode this week. And last week. So I'm good. :D

Mark sighed.

"How can that not be enough?" He asked her and she shrugged, biting her lip.

"It's just not. He didn't tell me about his girlfriend so how much could he have 'loved me' to begin with?" She asked him, saying the word loved sarcastically. Mark sighed.

"Meredith, did you hear a word of what I said? Derek doesn't cheat, he doesn't do anything out of the ordinary, and then he meets you and he breaks all of that, he goes against the rules that make up who he is, and he calls me on the phone to talk about a girl! It makes me feel like a fucking girl, and if I had to listen to him talk about you, you're going to listen to me, talk about him, talking about you!" Mark exclaimed, frustrated beyond belief.

Meredith raised her eyebrows.

"Fine."

Mark opened his mouth, prepared to yell again when he stopped. "Fine? As in-"

"Fine as in yes, yes I'll do it." She snapped.

"Alright then… so come by to the place tonight-"

"What?" Meredith asked, starting to panic.

"I can't, I mean… his place? Your place? The place where he lives, where he is with… her? I can't….."

"Meredith." Mark moved forward and placed his hands on her shoulders and spoke to her in a low calming way.

"Everything will be fine. Trust me, I know what I'm doing. Just know…" He hesitated for a moment before continuing. "Just know that I'm going to say things… a lot of things. Things that are normal for me, because trust me this is not the normal Mark Sloan. I don't do the whole gentle, concerned thing and if you tell anyone I'll have to hurt you." He stopped. "Maybe not, because Derek would kick my ass. The point is, I won't mean any of the things I'm going to say, at least not completely." He grinned. "So go along with me."

She nodded in agreement, wondering what would happen.

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Derek paced his bedroom floor, frustrated with himself, trying to figure a way out of this mess that he had created. His hair was wild from frequent run-throughs, and the edge of his jeans that hung over the back of his shoes were worn from being stepped on so many times. He frowned as he took a deep breath and looked at his door. He strode forward and quickly unlocked it, opening it and stepping out into the hall. He walked to the living room and he found Addison sitting on the couch, still in his shirt… her shirt… still in the shirt, much to his displeasure. She was sitting with her knees to her chest, watching TV with a sullen expression on her face. She looked up when he entered the room and her frown deepened. He opened his mouth to speak when there was a noise at the door, and in the next moment it was open.

"Alright, come on in, Meredith."

Derek heard a familiar voice say a familiar name and his stomach clenched. He quickly ignored Addison who was trying to talk to him and went to the front door where he saw Mark lead Meredith in, and she…. He couldn't believe it, she was wearing Mark's jacket. There were beads of water on it and he looked behind them to see that it was raining outside.

Meredith stepped in after Mark and she looked up and found Derek's eyes. They stared at each other for a moment before she quickly broke the gaze and slipped Mark's jacket off her shoulders. She handed it to him and he gave her a grin.

"Alright Meredith, you just ruined a two hundred dollar leather jacket. What are you going to pay me with in return?"

They had discussed this before. Mark was going to use whatever lines he could, no matter how cheesy as long as they were in front of Derek. She was to act either somewhat repulsed or to make some advances that went along with it.

"Oh Mark, that was horrible." She grimaced at him. He placed his arm around her shoulder and Derek felt his blood boil. "You know it could get a whole lot better." He winked at her and Derek's fists clenched and he took a step forward.

"Oh yeah." Mark yawned behind his hand, his arm still around Meredith. "Derek, Meredith, Meredith, Derek."

He grinned. "Excuse us Derek, but now that we're all introduced, Meredith and I have some ah… business to attend to. Studying, lots of studying. Research. Complicated research, very frustrating, so if you hear any screams or… moans, just ignore them."

Derek's face had gone white and his non-existent nails were digging into his palms, his jaw was clenched and a vein in his temple was throbbing. Any screams and moans that cam from Meredith's mouth would be because of him and they would be his name that came from her. They would be covered by his mouth, echoed by his voice.

"Come on Meredith." Mark led her to the living room and Derek followed, still livid. It didn't help when Mark's hand traveled down to Meredith's ass and she slapped it away, but she laughed. She never meant anything when she laughed. He swore that he might have burst a blood vessel.

Addison looked up from the couch and her jaw dropped when she saw the three of them enter the room.

"Mark? Meredith?"

Meredith forced herself to smile and she nodded to her.

"Derek, what's going on?" Addison asked, getting off the couch.

"That's my shirt." Meredith thought. She quickly pushed aside her anger and moved closer to Mark.

"What the hell is she doing?" Derek thought angrily.

"Well Addison," Mark began to answer her. "Meredith and I are just going to get… acquainted… study… we're going to do some… stuff. In my room. Very frustrating stuff, so just ignore the screams…." Mark grinned, but Meredith noticed it was a different grin, an angrier one. Addison's jaw dropped as Mark led Meredith to his room.

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Derek watched them leave and his jaw tightened even more when he heard the lock turn. He started to stride towards Mark's door but stopped and turned on his heel.

Fine. If this was how she was going to play it… that was low, going after his best friend, his best fucking friend. Ex-best friend, if he heard even one whimper that sounded suspicious coming from that room, he would break down that door.

Meredith was his. They both knew it, no matter how fucked up things had gotten, she was his. His only, the minute things got straightened out he would claim her as his own, over and over again in the only way he knew how. He would make her say that she was his and his alone, that she belonged to him, to never let another man touch her again.

The thought was making him slightly hard and he swallowed before going to the kitchen to get a glass of cold water. He drank it slowly, letting it pour down his throat and he took a deep breath before going to the living room.

Addison was still in the middle of the room, frozen as she looked at Mark's door, her jaw still open. Derek gave her a strange look before scooping her up in his arms and taking her to his room.

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Meredith laughed.

"So seriously, what the hell was up with that line you first used?"

Mark chuckled. "I was nervous, I've never used a line before that I didn't actually mean."

Meredith opened her mouth to say something when she heard a noise from a near by room. She furrowed her brow as she struggled to hear it and when she did she gasped. The sound of a body being pressed against a door, and a soft moan was all she needed to hear to confirm her worst fears. She started to cry softly and when Mark heard what was going on he went to his stereo and started to blast the music. He held her as she cried against his shirt and a moment later there was a knock at the door. He laid her down on his bed and she held onto the pillow, crying into it as he went to unlock his door. He opened it a little and scowled at Derek.

"What do you want?"

"Could you turn it down in here?" A shirtless, very agitated Derek huffed. Having sex, rather trying to have sex with Addison was not on his list of things that brought him endless joy, but if Meredith was doing… whatever it was she was doing with Mark, then so be it. Just then he caught site of her sobbing on Mark's bed and his eyes widened.

"What the hell did you do to her?" He shouted and he pushed by Mark. In an instant he was by her side, pushing her hair off her face gently.

"Mer, what's wrong?" He asked trying to soothe her, forgetting all about his anger for one moment.

"No-nothing! Just go back to your girlfriend! Your fucking perfect, Isabella Rossellini girlfriend! I'm not your bed warmer anymore, I'm not you damn dirty mistress!" She yelled at him before curling up even more.

Derek stayed there for a moment shocked at her outburst.

"Bed… bed warmer? Dirty mistress? Is that… is what you thought you were?" He said to no one in particular.

"You're… God, Mer…" He quickly moved away from her, feeling sick to his stomach at what she had said. She was anything but his bed warmer and she wasn't his mistress she was his… everything.

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AN: So, I'm not sure if I'm entirely happy with this chapter. Because a lot of stuff happened but it was kind of awkward for me to write it. I don't know why it just was. I knew that I wanted to have Mark take Mer back to his and Derek's. I knew that I wanted Derek to be pissed and I knew I wanted a reaction from Addison. The implied start of Addek sex though was completely unplanned though. Let me tell you, I was seriously choking back some McVomit when I wrote that. And then the other stuff kind of got planned as soon as that stuff happened. Derek knows what Meredith thinks she is now, and it makes him sick, literally. Because she's so much more to him than that, he can't even comprehend how she could think that little of herself, of them and he just… can't believe it. So yeah. This chapter was basically just about anger, jealousy, and plots. And then… I guess deep down there's some love. He didn't feel that way for nothing.

Oh, and happy birthday to me:D

Lol.

You guys… as always, your reviews just… yeah, I'm going to stop talking now, because I could go on forever trying to find words. So thank you, really, they mean so much to me. Final chapter? Not for awhile yet, but when it comes there's going to be a big list to you guys. Thank you so much.

As always, thank you for reading and please review!

-Mer/Em