Title: The Physics of Differences

Rating: K+ for a small amount of swearing

A/N: Ok so I have absolutely no idea where this came from but I'm pretty sure I have fallen in love with this fic. I also have no idea where the title came from but I found it interesting, so it's a different style of writing for me and I won't use it all the time but for this story it seemed to fit. Anyway please review because it's my birthday tomorrow and an inbox full of reviews will make my day.

Disclaimer: The papers seem to have gotten lost in the mail, so not yet.

He's Mark Sloan and he doesn't fall in love. Well, actually he has, but only once and he made a promise never to do it again. Falling in love made things complicated and hard, and he's Mark Sloan and he doesn't do complicated or hard. Well, maybe he does because he did Addison and she was all complications and sharp edges, but that's out of the context of what he was thinking and crap, now he sounds like Grey with the rambling and the awkwardness, not to mention the fact that he's standing there not answering her question and she's glaring and this could only end really badly. Plus she's got this whole my-cheeks-are-turning-red-but-I'm-going-to-act-angry-instead thing going on and it's getting kind of scary.

She's Christina Yang and she doesn't fall in love. Well, actually she has, but only once and she made a promise never to do it again. Falling in love makes people say and do stupid things and she's Christina Yang and she doesn't say or do stupid things. Well maybe she does, because she agreed to marry Burke and that was stupid, and she said she loved him and that was stupid, but that's beside the point and really this is his fault because he's kind of just staring at her and she knows she's glaring. But the time it's taking him to answer her stupid question, and the way his eyes sort of burn into her soul is causing her to feel all soft and giggly and that's an Izzie thing to do and it's pissing her off. Plus she's pretty sure she's blushing and the last person she's seen do that was Bambi, which makes everything that much more irritating.

He really has no idea where he got the idea to kiss her, but he's doing it and suddenly her backs against a wall and her fingers are fumbling for his zipper and he's starting to think it was his best idea ever.

She really has no idea why she's letting him kiss her but his hands feel so good running through her hair and this is the best she's felt in months, so she wraps her legs around his waist and smirks when he groans. Then she suggests they move to her place because she's absolutely positive she can get a STD from the on-call room beds.

He's pretty sure he's in love with the woman sleeping next to him. He's really tying to decide if he should just get up now but nixes the idea because she's Christina and an image of her kicking his ass for even considering her the kind of girl he can bang and then leave, so he relaxes back against his pillow and pray to God she won't kick his ass for staying.

She has really perfected her skill for pretending to be asleep while waiting for whatever random hook-up she had the night before to leave but he's snoring softly and she's pretty sure he's not leaving anytime soon. Really, she probably could have kicked him out already but there's this strange feeling she's having that feels a lot like safety but he's Mark and there's no way he can make her feel safe.

The suns been blinding him through her blinds for the past twenty minutes but he has made no attempt to move, although he really needs to get ready for work. There's a small groan and a very feline-type stretch happening on his right side and suddenly he's staring her straight in the eye and his heart may or may not have stopped.

There's actually something quite amusing with waking up to Mark Sloan in your bed because his hair sticks up in all these strange directions and he looks less like McSteamy and more like McJust-got-rolled-over-by-a-truck but she did not expect that giggle to come out of her mouth. But his face breaks into a smile and you really, really want to kiss him so you do because it six in the morning and it's the first time you've woken up happy in forever.

And he's Mark Sloan and she's Christina Yang and nothing will ever be the same again.

A/N: So I think I might continue this. Hmm tell me what you think please.