A new story! I know I should finish the other one first, but hey, this idea popped into my head and I wanted to write it. Anyway here is the story

Prologue

Six weeks. Six weeks had passed since Meredith Shepherd's world had fallen apart. Her husband of four years, Derek, had revealed to her that he had been having an eight month affair with his ex-wife Addison. According to Derek, it had started as a drunken mistake at Joe's one night and had continued from there. But now there were complications that had arose from the affair. Addison was pregnant, and Derek felt the need to tell Meredith. She knew that he would not have told her if Addison had not gotten pregnant, but she knew that she soon would be the laughingstock of the hospital. So she had moved out into the Archfield Hotel, conveniently (or inconveniently depending on one's point of view) across the hall from her husband's very sexy former best friend Mark Sloan. And it had been five weeks since Meredith had begun an affair with the very man her husband hated over all men: Mark Sloan.

The puking coming from the bathroom at 4:30 awoke Mark Sloan from his restful sleep. He and Meredith had not gone to bed until about midnight, as other activities were occupying their time. Reluctantly, Mark rolled out of the warm bed and went to the bathroom, where he saw the petite wife of his best friend paying homage to the porcelain god. He knelt down beside her and pulled back her dirty blonde hair, rubbing her back as he did so. When she finished, he sat back against the cool tile wall and after brushing her teeth, she crawled into his lap.

"Are you feeling okay Mer?" Mark asked, genuinely concerned about his lover's health.

"It's nothing, just a little stomach bug." But he could tell, he could tell she was lying. What was so horrible that she couldn't tell him? And then it hit him. Was she pregnant?

"You're lying," he said delicately.

"Maybe."

"Mer…please just tell me."

"I'm pregnant." She began crying into his chest. He soothed her, rubbing her back as he was freaking out in his head. Was the child his? Was it Derek's? Would he make a good father? Would he be a part of the child's life? He and Meredith had never talked about their future; they were simply having a good time.

And the question he could no longer hold in came bubbling to the surface. "Is it mine?"

Meredith buried her head deeper into his chest. "I don't know" she whispered. "I don't know how far along I am."

"What are we doing here Meredith?" Mark asked her.

Her beautiful green eyes came up to meet his. "What do you mean?"

"Are we just fucking or do you see a future for us? Are you going to divorce Derek?" His words came out a little harsher than he expected, or had wanted them to come out. He saw her eyes dim a little, and he knew he should apologize but her next words stopped him.

"I don't know yet." Hearing those words made Mark's heart sink because underlying those words were these: "I'm still in love with Derek."

I'm sorry that it is short but I wanted to at least get some of it out so I could start getting feedback. I haven't decided whether it will be MerMark or MerDer, so tell me what you think! Thanks!