Meredith sat at Joe's bar throwing back shot after shot of tequila. Seeing Derek and Addison strolling around the halls of Seattle Grace was way harder than she thought it would be. It left a big hole in her. One that she felt would never be filled no matter how hard she tried. She was in love with Derek she hated him and herself for it but couldn't get herself to stop. Meredith was truly broken, Derek had messed her up so bad she felt like she was going to be ripped apart every time she laid eyes on the man.

She felt the form of a human male pressed against her back and she turned around.

"Hey sorry I bumped into you. I'm Mark Sloan by the way", and attractive guy said.

Meredith smiled. "Would you like to buy me a drink?"

In answer, he sat on the barstool next to her and ordered one shot of tequila and one shot of gin. They downed them and started to flirt. After what seemed like an hour Mark leaned in and kissed her. He as an amazing kisser but somehow thoughts of Derek flew into her mind. Needing to be closer to Mark and farther away from thoughts of Derek she took his hand and led him out of the bar, to her car, to her house, and into her bed. After they both had orgasmed she realized that even though it was Mark in her conscious mind, Derek was the one she had been imagining subconsciously.

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The next day, having had breakfast and realized that they worked at the same place Meredith and Mark drove to work in Meredith's car since Mark had left his at Joe's. On the way in, Mark grabbed Meredith's hand. As they passed through the hall on their way to the elevator, everyone stared at them with shocked looks on their faces. They stepped into the elevator and the door was almost closed when Derek stopped it. Staring at them with a shocked look on his face, he stepped inside.

"What the hell?", he asked.

"What do you mean what the hell we are just in the elevator", Mark answered.

"Are you seriously with him now?", Derek turned to Meredith.

"Hey you don't get to do this to us you were the one that chose Addison. You didn't choose me so you have no control over who I choose to be with".

"Are you aware that he's ass of an ex best friend that had an affair with my wife?".

"Wait just let me explain you were never there for her so she needed someone", Mark interrupted.

"Well Mark proved himself trustworthy last night. If you will excuse us we need to go or we will be late", Meredith grabbed Mark's hand and stormed out of the elevator.

If she had bothered to look behind her she would have seen Derek looking longingly after them and Mark shooting Derek a smug look.

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Derek was standing on the bridge looking out over Seattle and thinking about his current problem. What the hell was Meredith doing with Mark? And what did she mean he proved himself trustworthy last night? A horrible answer to both questions clouded his mind. They had slept together last night. But Meredith wasn't stupid what could she possibly see in Mark? Well Mark was pretty damn charming, he could be manipulating Meredith into thinking he was some great guy that he wasn't. So Meredith was with Mark now. The guy who had destroyed his marriage and their friendship. The guy who he hated with all of his being. Suddenly Derek got an extreme urge to vomit as he thought about the fact that Meredith and Mark had slept together last night. He imagined Mark's hands all over Meredith's body as she arched into him. He envisioned Mark plunging into Meredith again and again. And worst of all he thought of Meredith's face twisted in pleasure screaming Mark's name as she came just like she used to do for Derek. Meredith was trembling and shaking and moaning all over Mark. That thought was the last straw as Derek rushed over to the nearest trash can and preceded to vomit violently into it. Is this what Meredith had to think about him doing with Addison whenever she looked at him? It was truly too much. He was surprised as his pager suddenly went off signaling him to report to the OR. He made his way up the stairwell and reached the OR. He was scrubbing in when Meredith walked in and began to scrub in also.

"So your sleeping with Mark now?", he asked in a hurt voice.

"He told you?", she asked.

" I kind of figured it out".

Derek stared at Meredith with hurt written all over his face.

"Seriously Derek what was I supposed to do? You are with Addison now. It's not like I can just pine for you all the time. You've clearly moved on and its time that I do too. And Mark walked into Joe's last night while I was downing tequila shots thinking about you and Addison. Being with him was the first time I have had my mind taken off of you for a long time. And it was something I needed. He's what I need to get over you and I would appreciate it if you could be happy for me. Or at least not make it so hard on us. I need to move on because there is simply no other option".

"Just so you know I'm not sleeping with Addison. Its not for lack of trying its just anytime we are anywhere close to sleeping together all I can think of is you and I don't want it to be that way. And its not that I don't want you to be with other guys. Its just Mark is not a good guy. He leads you on, manipulates you, and then breaks your heart."

"Derek no offense but when you chose Addison you sacrificed all rights to protect me. I have to take care of myself now because I can't rely on you. I'll just fall harder if that's even possible. I have to learn to be independent. I'm going to be really honest with you for a second. Its not because I want to hurt you I just need you to know. When you chose Addison it felt like my heart was being ripped from my chest. I'm just trying to learn to live without you and Mark can help me do that."

Just then Bailey walked in. She signaled for them to go into the operating room and for the rest of the operation, they were focused on the operation instead of their love lifes.

A/N: I hope you guys liked it! I am a new fan of Grey's Anatomy so I am only on the second season. However, I have heard a lot about Mark and got this idea. So Mark's character won't be very specific because he hasn't even been introduced into the show where I am yet. Anyway I am a huge MerDer fan. Please review!