A/N Hey guys, here's my first shot at a multi-chapter Addex fic as I am still in major denial that they aren't a thing even years later. Anyway, here's the first part, please let me know what you think! x

"Hey, what's Dr Montgomery doing here?" Cristina asked as she wandered up to Meredith, coat still on and bottle of tequila in hand.

"I felt bad, how could I not invite her? Almost the whole freakin' hospital is here at this New Year party, even people we barely know, I had to invite her, its the decent thing!"

They watched as the redhead in question shifted uncomfortably in the corner, looking around at everyone nervously.

Cristina snickered. "Seriously though, your boyfriend's ex-wife is at a party in your house, this is great! You're totally screwed!"

"Who's screwed?" Izzie wandered over with a plate of food, which they both started helping themselves to, despite Izzie's protests.

Cristina waved vaguely in Addison's direction. "Meredith is. She invited Satan to her party, Satan is in her house."

"It's not that bad. It just shows I'm a good person, right? I am a good person."

Izzie just laughed. "For once, I'm inclined to agree with Cristina. You are so screwed."

Addison shifted nervously as she stood in the corner of Meredith Grey's living room. She had no idea how she managed to end up here, in her ex-husband's 12 year old girlfriend's house, on New Year's Eve all alone, surrounded by people who hate her. She had no idea what possessed her to accept the invitation, was she some sort of masochist?

To make matters worse she spotted Grey, Yang and Stevens, huddled together laughing, with glances thrown in her direction. Just great, as it wasn't enough that she was at a party on New Year's Eve all freaking alone, now she was the laughing stock of it! Just wonderful, really really wonderful.

She turned to grab her bag, resolving to cut her losses and just ring in the New Year alone with a bottle of vodka at The Archfield. She picked it up and made her way to leave when she was stopped by a voice.

"It's the weird judgy friends, isn't it? I get it, you come, you don't want to be lonely, it's the holidays. And then the weird judgy friends swoop in like vultures and pick you apart, staring and sniping, like they're all high and mighty and you're a piece of scum. Weird and judgy."

Addison just stared at the woman in front of her blankly. "Uh, sorry, who are you?"

"Oh right, didn't introduce myself, silly me. Torres, Callie Torres, ortho resident and genius, dates George O'Malley, and has to deal with the weird judgy friends on a semi regular basis."

Addison just laughed. "Well Torres, Callie Torres, ortho god, I am Add-"

"Addison Forbes Montgomery, baby saver extraordinaire!" Addison looked at her in shock as Callie laughed. "Oh come on everyone knows who you are! You save freaking babies! Plus there's the whole scandalous marriage, breakup, had an affair with the hot plastic surgeon and broke up her marriage stuff."

Addison looked even more shocked as she stared at the woman in front of her. "Too soon?" Callie asked.

Addison let out a genuine laugh. "No, you know what? I needed that. I like you Torres. Want to get drunk?"

"Do you even have to ask?" Callie smirked.

"Hey Bambi, get over here. Your girlfriend is making friends with Satan."

"Satan?" George looked over to where the three women were pointing, and saw his girlfriend laughing and drinking heavily with Addison Montgomery. "What's Dr Montgomery doing here?"

"Meredith invited her." Cristina stated as she shoved her face full of chips.

"What? Why?!" George cried.

"Oh come on people, it was the right thing to do! Is it so hard to believe that I was being a nice person? She had no one, I couldn't not invite her!"

"Mer, you're all dark and twisty, you are not a nice person. Crazy however? Yeah you're a crazy person. It's your boyfriend's ex-wife. Boyfriend's. Ex. Wife."

Izzie looked at Cristina. "Don't listen to her, Mer, she's had too much tequila. You are a good person, she's right about the crazy though."

"Who's crazy?" Karev asked, as he wandered in with a crate of beer in his arms. "Sorry, I was stuck in surgery, I brought booze though."

"Mer's crazy. She invited Satan to her party." Izzie explained.

"Dude, Addison's here?" Alex asked.

"Addison? When did you get on a first name basis with Satan?" Cristina asked.

"Actually she prefers 'The Ruler of All That is Evil'." They looked up at the new voice as Derek wrapped his arms around Meredith and place a kiss on his cheek, accepting 'surgery' as an apology for his lateness. "Anyone mind telling me why my ex-wife is drunk and in my girlfriend's house?"

They all laughed. "Dude, your girlfriend invited her." Alex said.

"Huh." Derek looked over as Addison and Callie threw back another shot.

Derek was right. Addison was very, very drunk. She was lonely and sad and found a great new friend who wanted to drink with her. So she drank. A lot. The only problem now is that said friend disappeared off with her boyfriend (probably having sex somewhere), which left her in the same predicament as earlier; all alone with people who hate her. Only now, she was outrageously drunk and it was 5 minutes until the New Year and she was alone.

She felt a hand on her back and looked up swaying into the eyes of her intern "Addison."

"Heyyy Karev," she slurred. "Have I ever told you that I don't like you?" She hiccupped. "I hate you. I hate you because you're so damn hot and its distracting cause i want to rip your clothes off." She hiccupped again. "You're just so God damn hot."

Alex let out a low chuckle "Have I ever told you that you're so God damn drunk?"

She hit his chest and glared. "Don't be an ass." The anger faded into sadness. "I'm all alone."

He reached up and stroked her hair. "You're not alone."

Meredith's voice rang out "Guys, countdowns about to start! 10…9…8…7…6…5…4…3…2…1…Happy New Year!"

Alex leant down and pressed a light kiss to Addison's lips. "Happy New Year Addison."

She smiled up at him then quickly frowned bringing her hand to her mouth. "You okay?"

She shook her head and then turned to run, promptly tripping over her own feet. Alex caught her and then groaned as she uncovered her mouth to throw up on the floor.

"Derek?" Meredith got his attention as they stopped kissing for the New Year. "Your ex-wife just threw up on herself in my living room."

"Shit," He muttered as he saw the state Addison was in. "I should probably sort her out."

He started to go over there when he saw Alex picking her up off the floor and start carrying towards the bathroom. "I've got this, Shepherd. Can you just clean up the sick on the floor?" Derek just sighed and nodded, thanking him.

Alex placed Addison on the floor next to the bath, as she started crying and apologising over and over again. He hushed her as he took off her dress and balled it up, leaving her in just her underwear. "You're going to kill me when you remember this tomorrow, Addison."

He turned the shower on and put her under the water, washing her hair and the sick off her body, before wrapping her in a towel. She was still crying so he picked her up and carried her to his room, placed an old t-shirt of his on her, tucking the duvet up on her.

"I'm scared." she whispered. "I'm all alone and I've never been all alone."

He stroked her hair and kissed her on the forehead. "Go to sleep, Addison. You're not alone."

He left a bucket and a glass of water next to the bed and turned the light off before heading back to the party.

He went back down the stairs and walked back over to the group just as Derek rejoined the group.

"She okay?" Meredith asked Alex.

"Yeah, I put her in the shower, gave her some clean clothes and left her in my bed with a bucket. Figured she should crash here tonight. God, she's going to kill me tomorrow when she remembers I saw her in underwear."

"Well, I cleaned up all the vomit on the floor and Karev has seen my ex-wife half naked. Party turned out great, Meredith, well done." Derek said.

They all burst out laughing before Cristina holds up an almost full bottle of tequila. "More?" and they drank to the New Year.

Addison woke up the next morning, opened her eyes and instantly groaned as the light felt like it was splitting her head in two. She hesitantly peaked again and saw a bucket laying on the floor next to her and she rolled over, picking it up and throwing up into it, before laying back down with a groan. She felt like crap.

She barely remembered the night before from about 10pm onwards. She remembered meeting Callie, who was funny and great and really helped the awkwardness she felt at being at her ex-husband's girlfriend's house with alcohol. A lot of alcohol. She remembers drinking vodka after vodka after vodka. Then it's all in flashes. Callie went off with George. She was by herself. Karev coming over and talking to her. Then blank.

"I knew leaving that bucket there was a good idea." She looked up at saw the smirking face of her intern and for the first time since she woke up, fully realised her surroundings. She was not in her hotel room but instead in a bed that meant she was still at Meredith Grey's house, only just wearing her underwear and someone's t-shirt. Crap.

"Karev, could you talk quieter please? My head is going to explode." She groaned into the pillow as he moved over and sat on the edge of the bed next to her.

"Sorry." For a moment, she almost thought she saw concern on his face. "I brought you a couple of aspirin. Figured you'd need them after last night." The smirk was back again and she wondered if she had imagined it leaving.

She begrudgingly offered him a quick thank you as she took the pills and swallowed them. "What the Hell happened last night?"

"You don't remember?"

She shook her head, then regretted it. "I remember Callie leaving and you walking over. Then nothing."

Alex chuckled. "Well you're gonna love this. You were by yourself so I came over for a bit. You were very drunk, it was interesting." He smirked again and oh, she hated Drunk Addison right now. "Then Mer did the countdown, we kissed, then you fell over and threw up over yourself."

"I WHAT?" Addison sat bolt upright and immediately wished she hadn't as the room span alarmingly around her. "I threw up over myself?! In front of everyone?!" She took back her earlier statement: she was going to freaking kill Drunk Addison.

"Hey, don't worry about it. Seriously, you were drunk and upset and if anyone deserves to be drunk, it's you after the year you've had." She stared at him and he cleared his throat awkwardly; he had no idea why he felt the need to make her feel better. Just the same impulse came over him as when he didn't want her to be alone the previous evening. "Anyway, erm, yeah. I picked you up off the floor and carried you into the bathroom. Cleaned you up and put you in the shower, then put you to bed. Shepherd cleaned up the vomit in the living room."

Addison at this point was the same colour as her hair. "I, erm, thanks. You didn't have to do that so thank you. And sorry." She let out a light laugh. "Guess that explains what happened to my clothes."

"Oh right, yeah. I stuck your dress in the wash but I'm not sure it's going to come out. Hope it wasn't too expensive."

She wasn't about to mention that her designer dress was in fact very, very expensive and most definitely should be dry clean only. Instead she just gave him a smile and offered her thanks instead.

"I'm going to be even more of a laughing stock at the hospital now. I can't believe my ex-husband and my intern had to clean up my sick."

"Hey, no one's laughing at you, okay? Now did you want anything to eat?" At the thought of food her stomach turned again and she declined. "Cool, well you can stay as long as you like and when you're ready, I'll steal some shorts or something from Izzie and drop you home if you want?"

"Thanks, that would be great actually Karev. Do you mind if we leave soon? I just want to get out of here before I manage to humiliate myself further." He nodded his consent and turned to leave when her voice stopped him. "Alex? I mean it. Thank you so much. You're a good guy."

He smiled at her then walked out of the room, ignoring the fluttering in his chest that her words caused.

He walked into Izzie's room and found Meredith and Cristina in there as well. He ignored them and just started routing through the chest of drawers.

"Alex, what the Hell? Why are you going through my stuff?!" Izzie glared at him, throwing a pillow at him so it bounced off his head.

"I was trying to find some shorts for Addison. I'm going to drop her home."

Cristina snorted. "Oh McVomit woke up, did she? Man, you're whipped doing this for her; you're like her puppy."

"Yang, shut it okay." Alex snatched up a pair of shorts out of a drawer and slammed it shut. "She's a good person and doctor so don't call her that." he snapped as he left the room.

"I think Evil Spawn has a thing for Satan."

"Holy shit, Alex has a thing for Dr Montgomery, he really likes her." Izzie realised.

"Of course he does, he showered vomit off her for Christ's sake!" Meredith groaned and lay face down on the bed. "I just can't believe McDreamy's ex-wife threw up in my living room."

Alex dropped Addison back to the hotel, without her having to see anyone at Meredith's (thankfully for her) and with minimal conversation. Mostly due to the fact that she was hungover and humiliated. All he got from her were just repeated apologies to which he kept reassuring her that it was fine.