This is just another idea that came randomly into my head. I've always tried to picture the future, when they all start having kids. And I picture how Mark Sloan would be with children, as an uncle, Mark Sloan as a father…. I have confidence that eventually Mark would be a caring and doting father on the show.

This is a lighthearted piece, written on a Friday night as a form of entertainment for myself. Haha. Enjoy!!

Disclaimer: I do not own the Grey's characters. I however, do own Noah and Katie.

Year 2015

If there was one thing Mark Sloan was extremely sure of, it was that he was never going to be a father. Or at least not a good one.

And that is exactly what he was planning to tell his wife of 2 years, Lexie, when she brought up the subject of babies again.

' Lexie dear, why the change of mind? I remember you saying that you wanted to wait until you finish residency to start a family…..' Mark was trying to reason.

' Yes..but that was like 2 years ago, Mark. I….I feel like my biological clock is ticking…' said Lexie, who was standing in front of Mark, wearing a very sexy black lingerie.

Mark was about to open his mouth to reason with her, when the phone rang.

'I'll go get it….' said Lexie, causing Mark to breathe a sigh of relief. Hopefully when she returned to the bedroom, she would've forgotten about this conversation.

Lexie returned back to the room 5 minutes later, with a sly smile on her face.

' Who was that?' asked Mark anxiously.

'Meredith and Derek are bringing their kids over tomorrow. They need our…I mean my babysitting services.'

' Can't they just leave their children in the hospital daycare?'

'Mark!' Lexie exclaimed. 'Hasn't Derek told you? They're going to Paris for the weekend to..umm…celebrate their 5th wedding anniversary.'

' Can't they dump their kids somewhere else….with Izzie, with a nanny….'

'Mark…' this time it was more of a warning.

'They are my nephew and niece and I'm their aunt and you're their uncle. So please stop acting like a baby…'

Mark groaned inwardly. He can picture it now, the kids running about and turning his entire house upside down. This is great. Just great.

The doorbell of the Sloan household rang at exactly 9am the next morning. Lexie opened the door to reveal the entire Sheperd household standing outside. Derek was holding the hand of a little boy while Meredith was carrying a little girl in her arms.

' Hey!' Meredith smiled at her sister. 'Thanks so much for agreeing to take care of the kids..... I'll buy you some souvenirs from Paris…'

Lexie laughed. Her sister's rambling was cute at times….

'Hey Katie!' she greeted her niece, as the little girl was transferred into her arms. 'She has grown so big since I last saw her!'

'She has just learnt how to walk' said Meredith proudly.

' And say Daddy.' Adds Derek.

' She said Mummy first…'

Lexie shook her head. Do they have to argue about this?

' Noah has just started his first week of kindergarten. Haven't you, Noah?' Derek looked down at his son, tickling him lightly on the tummy.'

' Yeah. I luv it! Many fwiends there!' Noah piped up, causing the three adults to laugh.

'Where's Mark?' Derek asked suddenly. 'I'm pretty sure he's off for today.'

'He's umm….' Lexie contemplated covering up for him, before finally deciding to screw it. ' hiding.'

'Hiding?'

'Yeap. Hiding from the kids.'

Meredith and Derek exchanged a look and Meredith started giggling. 'That's so Mark….'

Meredith looked at her watch.

'Oh no….Derek, we're running late….'

'Ok… so….here are the list of instructions…..the dos and don'ts…' said Meredith hurriedly, as she handed a long list written on an A4 paper to Lexie, and an overnight bag full of the children's stuff.

'Oh…and make sure Noah doesn't start grabbing a crayon and scribbling on the walls….he has been doing that a lot lately.'

' And make sure that Katie doesn't walk about destroying every single thing that comes her way….'

' And no icecream treats for them if they are being naughty…..'

Lexie nodded, trying to digest the heap of information that had been thrown at her.

'Thanks again Lex!' Meredith hugged her sister and kissed her children goodbye before hopping into the van with her husband.

Lexie was now standing alone at the carporch with her niece and nephew.

'Come on, let's go in…' she says, ushering the two kids inside.

The house was eerily quiet. Lexie settled the two children down at the living room sofa and switched on the TV.

Just then, Lexie's handphone rang and she answered it.

'Mark!' she called out a moment later. No answer.

'Mark!!' still no answer.

' Marcus Dylan Sloan! Can you please come out of your hiding place now! This is urgent…'

Finally she heard the creak of the stairs… and soon Mark appeared at the bottom of the stairs.

' Mark….I just got called to an emergency surgery with Dr. Arizona Robbins….. I've gotta go…'

' But you are off today! You told me you weren't on duty today!!'

Lexie sighed. 'Yes, I wasn't, but as you know, the hospital has been short of staff lately….ever since the Chief retired, everything has been in total chaos…'

'Why can't she call someone else to scrub in? Cristina would love to…. or Alex…..'

'Mark….I got called, I've gotta go. I love you and my niece and nephew, but I love my job as well…' Lexie said suddenly, giving him a kiss on the cheek.

' But…the kids…'

' I'll be back as soon as I can, I promise.' It's just a few hours with them, Mark…' Just get them to watch TV, let them have a nap or something…..'

' Be good for Uncle Mark ok?' Lexie said to Noah, who was now standing beside her, looking around curiously.

With that, Lexie was out the door.

And Mark was left alone with the two Sheperd kids.

By now, the two children were standing in front of him and staring at him. Noah, who was now 3 and a half, was an exact replica of his father, from the McDreamy hair, to the blue eyes. The only feature he took after his mother was the nose. One year old Katie, on the other hand, looked exactly like her mother, with golden wavy curls and green eyes.

Anyone who saw them would've proclaimed them cute and adorable.

But not Mark. For Mark Sloan, children were just like monkeys, always up to mischief. And to him, children were a major inconvenience, and were a way of punishing people for having unprotected sex.

' Uncle Mark, we go out and play?' Noah asked, grabbing his hand, oblivious to Mark's thoughts.

Katie, eager to join in the conversation, babbled excitedly.

Mark closed his eyes and tried to calm himself down.

' You can do it, you can do it, Mark' he tried to tell himself. They are just children, they're your niece and nephew after all. There's no harm in just spending a few hours with them entertaining them, you're not going to screw that up!'

He opened his eyes again, and the little boy and girl were still looking up eagerly at him, as if waiting for him to do something.

'Do you want to watch TV?' Mark asked.

Noah shook his head vigorously. 'No TV, not now..' he said. 'I want to go out play!'

'Alright, let's go to the playground then.' Mark sighed.

' Uncle Mark, why you look so unhappy? You don't like play?' Noah asked suddenly.

Mark was taken by surprise. He didn't know children can read facial expressions so easily.

' I…umm… do I look unhappy? I feel fine' he finally replied his nephew.

Within a few minutes, they were walking towards the neighbourhood playground, with Mark carrying Katie at an awkward angle with one hand and holding Noah's hand on the other.

Slowly, Mark began to relax. Maybe, just maybe he could do this after all.

Katie began to squirm in Mark's arms, eager to get down.

'Hey young lady, why are you so restless!' Mark said as he gently put her down. He held her right hand and was about to grab Noah with his other hand … when he realized that Noah was not there.

'Noah!' he cried out. There was no sign of the boy.

Mark sighed. He was right. He couldn't do this after all.

But first, he had to find the boy, or else his best friend would kill him- that's if his wife didn't kill him first.

I might continue this piece after all, at least for 1 more chapter. Would you like me to continue? ;) Reviews are very welcome !!