A/N: I am sorry x 1,000,000! Time has gotten away from me. I have a good portion written though. Writer's block plagued me for a while, but it seems to be slowly dissipating. Just as a note, personally, I like Addison, but I need a villain and she just fit in too perfect. If you don't like Addison, please don't be mad, but this was just too perfect to soften. PLEASE PLEASE PLEASE REVIEW!

Chapter 24

The next day Mark and Izzie brought the kids with them to work. Derek and Grayson offered to entertain them while they were in surgery. They were walking through the hospital lobby when they heard someone call out Mark's name. Sharing a pained glance, Mark and Izzie turned to see Addison clicking her way towards them.

"Well, if it isn't the happy couple. Dr. Stevens, I hear congratulations are in order," Addison said, her voice acidly sweet. "When's the wedding?"

"Um… we haven't really had a chance to discuss it. Sometime before the babies are born," Izzie replied, slightly flustered.

"Yes, Mark mentioned you're expecting twins," Addison said. "You're going to have your work cut out for you. The working mother of four. I'm surprised you're still working. You don't even have a nanny?"

"No, Ella and Caden are in school most of the day and our schedules work out so that one of us can pick them up. We haven't really discussed what we'll do when the twins are born, but I'm hoping we can arrange it so we don't need a nanny. I think if you're going to have children, you should raise them yourself as much as possible," Izzie replied coolly. Stifling a smile, mark wrapped an arm around her waist and gave her a reassuring squeeze.

"Daddy, who is the tall lady?" Ella asked, observing Addison from her perch in her father's arms.

"You must be Ella. You're a very pretty little girl," Addison cooed. "Are you a daddy's girl?"

"My daddy and mommy say I shouldn't talk to strangers," Ella demurred pertly.

"Ella, Caden, this is Dr. Montgomery. She used to be married to Uncle Derek," Mark said by way of introduction. Caden gave Addison dark looks as he inched closer to Izzie and Ella pressed her head shyly into Mark's shoulder.

"If you'll excuse us, Addison, we've got to get to work," Izzie said. "Grayson is expecting us."

"Don't let me keep you. It was lovely to see you all," Addison said sweetly. As Mark and Izzie led their kids through the lobby, Addison fairly turned green with envy. Izzie Stevens had her life. She had babies, a blooming surgical career and a man to share them with. Well, she had those things for now, but not for long if Addison Forbes Montgomery had her way.

MIMIMI

Later that day, Addison spotted Mark at the nurses' station talking with an older version of himself. As she got closer she noticed that Caden stood with them wearing a mini lab coat, listening intently to his grandfather and father. Before she reached the little group, the older man led Caden off, a patient's file in hand.

"Since when are you and Grayson the omnipotent so civil to each other? How long has he worked here?" Addison asked conversationally.

"Well, part of the new Mark Sloan is that he values family. When I told Dad about Ella and Izzie, we decided to stop being so bull-headed and be a family. He's great with the kids and loves to help out. I sometimes think he'll kick us out of our own house just to get to baby-sit," Mark said fondly.

"I take it Caden wants to be a surgeon when he grows up," Addison remarked.

"He loves science and anything to do with life. Right now he wants to be a 'heart-fixer' like his grandpa, but last month he was on his way to being the world's greatest neurosurgeon."

"You don't want him to be a plastic surgeon? Groom him in your image?"

"My dad tried that with me and I despised him for it. I want my son to do what makes him happy. He's had enough disappointment and rejection in his short little life. As long as he knows that his family loves and supports him, he can be a side-walk artist for all I care," Mark said.

"You have beautiful children, Mark, but come on. You and Izzie? It'll never last. She's too perky and happy for you. And then there's the sex," Addison said, pressing herself seductively against Mark.

"The sex?" Mark looked flabbergasted.

"Do you really think you'll be getting any with four little ones around?" Addison chuckled. "I'm an OB/GYN. I see it all the time, especially after multiple births. Mom's libido dwindles. The babies take up all of her time and Daddy gets left out in the cold. Dear, oh dear, what will McSteamy do to scratch the itch? Maybe Satan can help you out if you ask nicely," she purred.

"There's more to a relationship than just sex, Addison. I plan to promise Izzie for better or worse until death do us part. You remember those vows you took with Derek? I don't intend to break them when life gets a little rocky. I love Izzie. I want to be with her through the good and the bad. What about that don't you get?" Mark fumed, before storming off in high dungeon.

MIMIMI

"Addison," Izzie called, spotting Addison in the hall.

"Dr. Stevens, how nice to see you," Addison said, with false politeness. "My, you're getting big. When are the twins due?"

"In December. Meredith's due in November," Izzie replied.

"Yes, I had heard that I assume you're seeing Dr. Karev."

"Yea, Alex has helped me with both my pregnancies. He's Ella's godfather."

"Much to my surprise, he's one of my most successful protégées. It's interesting to come back and see how the careers you and your friends have developed. It feels good to be back in a real hospital. So, how is your pregnancy progressing? Any problems?"

"I've had to work against morning sickness, but so far that's the only problem. Everything else is fairly normal; cravings and fatigue, you know the drill," Izzie said. "I'm surprised that you don't have any babies of your own. I mean, babies are your life."

"Yes, well, it's sort of like those who can't, teach. Those who can't have babies, work to make them," Addison defended. "Was there something you needed, Dr. Stevens?"

"Yes, actually, there is. I need you to stay away from Mark. He has become this amazing person, but he still doubts himself. You coming here and telling him that he's not who he feels he is hurts him. He is my husband, the father of my children. We have a great life together. I'm asking you, woman to woman, not to ruin that," Izzie asserted firmly.

"Aw, are you scared, Stevens? He's not your husband yet and he moved his entire life to be with me at one time. How are you going to handle a man as… virile, as Mark when you're chasing down kids and smelling like belly excrement all the time? I'm not going anywhere, Stevens. I want Mark and I always, always get what I want," Addison promised, her eyes flashing with challenge.

"You know what, Addison, you make me sick. Spoiled rich bitches like you have always pissed me off. You think you can blaze in and get whatever you want. Well, you can't have Mark. He doesn't want you. You ruined any chance you had with him when you aborted his baby and slept with Alex. You used him as a chess piece in your bid for Derek's attention and you almost broke him. But you constantly underestimate him. He built himself back up and is a better man because of it. This isn't a single relationship you're messing with Addison. We have two kids and two more on the way. What about them, Addison?"

"Oh, we'll get custody of the kids, of course. I'm sure a judge would be willing to give us at least primary custody when he hear the tale of the world renowned neonatal surgeon who can't have children of her own, but wants to raise a family with the love of her life. Don't mess with me, Stevens, I can take away everything you hold close if I really try," Addison threatened, before strutting down the hall. Izzie stood there trying to catch her breath for a few minutes. She leaned against the wall, cradling her stomach. She closed her eyes; mentally telling herself that none of what Addison said was true.

"Hey, looks like I found the most gorgeous mommy in the world," Mark's voice penetrated her thoughts.

"Hey yourself," Izzie greeted him weakly.

"How are my babies?" Mark asked, settling his hands on either side of her belly. Before she could reply, Izzie felt a kick in the places where Mark's hands were resting. Izzie winced a little, but it was quickly turned into a smile at the tender grin that lit Mark's face.

"Hi babies," Mark cooed at her stomach, leaning down to kiss it. "Daddy love you all the way to the stars and back. I can't wait for you to get here. Mommy and I are gonna take care of you and you've got a big family ready to love you. And you know what? You get to have a daddy who loves your mommy more than anything in the world." Izzie's eyes overflowed with tears as Mark kissed her stomach one more time.

"So, I know this might not be the best time, but how would you feel about having the wedding in two weeks?" Mark asked, brushing away Izzie's tears with his thumbs.

"Two weeks?" Izzie echoed.

"You wouldn't have to do anything. Dad, Hannah, and I can take care of all the details. It would be small and simple. All you would have to do would be to find a dress and show up at the chapel a week from next Saturday."

"Are you sure? You don't want to have a big fancy wedding?" Izzie asked.

"I want to be your husband. If you're ok with a small wedding, then I'd like to get married now, before you have to go on maternity leave and all the baby craziness starts. I just want to vow in front of our friends and families to love and be with you forever," Mark assured her.

"I've never wanted a huge wedding. I hate all of the fuss involved in planning big weddings. So, I would love to get married in two weeks," Izzie said, kissing Mark soundly.

"Well then, soon-to-be-Dr. Sloan, I have a wedding to plan and you have work to do and a dress to buy," Mark said, patting her butt before striding down the hall whistling to himself.

Despite her encounter with Addison, Izzie felt a well of happiness bubbling up. She was getting married to the man of her dreams. Seriously!

A/N: Reviewing reminds me to update, so review often 0 ; )