Disclaimer: I don't own Grey's Anatomy or Private Practice if I did you can be sure that Mark and Addison would have ended up together.

Summary: Instead of giving the baby away Sloane died during child birth and left Mark alone to raise the baby. Enter Addison in the picture because she can't let her friend suffer through this alone. Mark will still be pining after Lexie and Sofia will still happen but the end goal is Maddison

A/N: This is my first shot at writing Grey's Anatomy I hope you guys like it.

Prologue

Seeing one of her oldest friends sitting in the OR looking utterly broken was probably the hardest thing that she had ever faced. Addison Montgomery didn't want to admit it but the man sitting by the body on her operating table was quite possibly the love of her life. She allowed herself a moment to stand back and study him before trying to go over and talk to him. After giving herself the time to take in the features of his muscled back she finally got up the nerve to go over and try to get him to leave.

Mark Sloan peered up at her a haggard haunted look on his normally handsome face when he felt her hand on his shoulder. His eyes were ghostly and hollow looking. His dry cracked lips were parted slightly like he wanted to say something to her, but the words wouldn't come. He couldn't make himself speak, so he just relaxed under her touch.

"Mark," Addison said stooping down in front of him, "come on you can't sit in here anymore it's time to go." She told him gently pulling him up off the stool he was sitting on. She was surprised that he allowed her to take control so easily. In the three hours since she had seen him last no one had been able to get him out of the OR.

Mark gripped her hand tightly in his larger one and he allowed her to lead him out of the OR. "I was just saying bye." He explained to her feebly.

"It's ok, Mark, I know." Addison assured him sweetly. "So, what do you say I take you to see him?" she asked and Mark shook his head. "Ok, then how about I take you home?" she tried again and again he shook his head stubbornly. "Then you're gonna have to tell me what you want, Mark."

"I just feel like I need to be here I just wouldn't feel right leaving them alone." Mark told her his voice sounding detached.

Addison smiled at him reassuringly. "Alright, then it won't hurt you to get some sleep." She was happy when he didn't object to her leading him to an on call room.

"Don't leave me, Red, I can't be alone right now." Mark begged as he gazed at her with pleading eyes. He just didn't think he was capable of being alone at the moment.

Addison sat down on the bunk beside him. "I'm not going anywhere, Mark, I'm right here for as long as you need." she assured him sitting close to him.

"Addie, I hurt and I don't wanna hurt right now." Mark told her before leaning forward and capturing her lips between his own. He was going to take the pain away the only way that he knew how with sex. It was really the only thing that he did right.

Addison wanted to protest, but instead she found herself deepening the kiss and melting into him. It was always easy to fall back into bed with Mark he knew her and the right buttons to push to bring her to the edge of ecstasy and push her right over. So that's why instead of pushing him away and listing the reasons why doing this would be stupid she said "Let me lock the door," her voice was full of the passion he had aroused in her.

Addison turned away from him to lock the door, before she could turn around and make her way back over to where she had left him he had her pressed up against the door and his lips were hot and hungry on her neck. A moan caught in her throat and her hands flew to the hem of his scrub shirt. This was right this felt the way that things had before LA and Lexie and everything else that had come between them.

Mark raised his arms and allowed her to pull his shirt over his head before diving back in and kissing the spot just above her collarbone that he knew would have her out of her panties in no time. This was good it was right and more importantly it kept him from thinking about the reason she was there to begin with. When she allowed him to pull her salmon colored scrub shirt over her head and expose her breasts to him that allowed him to forget the fact that he had just lost his daughter.

Three days ago Sloane had shown up on his doorstep now heavily pregnant and promptly passed out in his arms. He had quickly ushered her across the street to Seattle Grace Mercy West Hospital where the OB resident determined that she suffered from preeclampsia. Her condition had stabilized initially only to grow worse again a few hours later. Knowing that after the way he had left things with Addison the last time he had saw her in LA Mark wouldn't want to call her, Derek in his role of chief of surgery called his ex in to consult on the case.

At first Addison had been hopeful that she could get the condition under control without any lasting damage to Sloane or the baby. But as the days progressed her condition continued to deteriorate and finally she had no choice but to perform an emergency c-section or risk losing them both. She had been able to successfully deliver the baby at thirty-two weeks and he had him rushed up to the NICU under the watchful eye of Alex Karev who would assess the situation and let her know if anything further needed to be done.

In the perhaps thirty seconds it took for her to rush the baby away and put him in Karev's care Sloane had taken a turn for the worst. Despite the c-section being a safer way for her deliver with her condition her blood pressure had still spiked through the roof and she had stroked out right there on the table. Even Addison's best efforts to save her including calling Derek in right away there had been nothing that they could do.

As soon as time of death had been called on Sloane Addison rushed off to the NICU to see about the baby. She would have loved to be the one to inform Mark of his child's death but she had to tend to his grandchild so he didn't lose both of them. She with the further assistance of Karev had rushed the baby into surgery to remove a small portion of his intestines due to a complication from being born early. Other than that there were no abnormalities and he was healthy and would have no lasting complications.

After she finished the surgery she had gone off in search of Mark only to run into Derek to tell her in the three hours she had been in surgery no one had been able to remove Mark from Sloane's side. And that had led them to the position they were in now naked in the on call room and in the throws of passionate sex. Though neither of them knew this was just the beginning of the adventure for them.

A/N: here is the first segment of the story I hope you guys enjoyed it more to follow really soon. Until next time please review.