Disclaimer- This story is Rated M. If you don't want to read about two women getting it on, please leave lol.

A/N: Well, I'm back again with another Alt Universe for Callie and Arizona. I've always wanted to write a story about two characters that don't get along, but obviously have a strong chemistry between them. Hope you like the first chapter.

Chapter 1

"I think that's everything," a saddened voice declared.

"Good," Arizona replied with indifference.

Arizona's ex-girlfriend, Joanne, had stopped by the apartment to pick up the last box of her things. Just a week ago, Arizona had walked in on her partner of two years, sleeping with another woman. Cheating was not something Arizona Robbins tolerated. As far as she was concerned, their relationship was over.

Holding the box in her arms, Joanne now stood in the hallway and turned around before Arizona could close the front door. "Baby, please don't do this to us. We can still work this out. I know I fucked up, but I still love you."

The blonde shook her head. She was so tired of hearing Joanne's endless apologies. "You did this to us, Joanne. If you truly loved me you wouldn't have had another woman's head between your legs."

Joanne cringed at Arizona's graphic description and shook her head slightly. "Arizona…"

"Don't. Don't write, don't call, and don't come back here ever again. Goodbye." And with that, Arizona slammed her apartment door.

Two years of partnership. Arizona thought they were building a life together. Maybe have a house of their own, kids, and grow old together. Well, the kids part was something Joanne brought up, but not something Arizona wanted to discuss. In all honesty, Arizona was not surprised Joanne cheated. Their relationship had been rocky for months and the arguments were becoming more frequent. Joanne often accused the blonde of loving her job more than her and that they were not spending enough time together. But even when they would fight, it always led to awesome makeup sex. But that's all it had become. Empty, emotionless sex. Arizona had loved that woman with everything she had and she would have never cheated. She was the monogamous type.

Joanne also hated that Arizona was a cop. In fact, she despised it, but Arizona loved her job and making sure the streets of Seattle were safe. It was what she lived for and she did it well.

The blonde leaned her forehead against the apartment door and blew out a breath. "Fuck you, Joanne…" she whispered.

Since it was her day off, Arizona decided to stay in and order some takeout. She had never been handy in the kitchen. Cooking was something Joanne handled, so she knew there would be tons of microwave dinners in her future.

After her doing her ritual of 100 push-ups and sit-ups, the blonde settled into her bed for the night. Even though things were going to shit in her personal life, she tried her best not to reflect that when on the job. To everyone else, she was a perky, carefree cop that was tough when she had to be. This is exactly the impression her new beat partner was going to encounter. They were to meet tomorrow.

A young blonde bombshell was in a fit of giggles as she was chased into her apartment by an anxious Latina. Once inside, she was roughly slammed against the door. Luscious curves pressed against the front of her body. Everyone woman wanted a night with Callie Torres. At least that's what they said in Miami… and tonight, this girl was the lucky pick. Callie's lips attacked the blonde's mouth and their tongues dueled lustfully. The Latina wasted no time hiking up the blonde's skirt and reaching between her legs.

The blonde broke the kiss, breathing heavily. "Wait… let's go to my bed."

"No. I want you here," the Latina growled. Callie shoved aside the younger woman's thong and plunged two fingers deep inside the blonde.

"Oh, fuck!" the woman screamed, as pleasure and thrills coursed through her body. It was exhilarating.

By day, Callie was a badass cop, but by nightfall, this was what Callie did best. She'd pick up some hot woman in a club or bar, and either head over to their place or somewhere else secluded. They never went to her bed. It just made her uncomfortable. She herself did not quite understand why she could not sleep with a woman in her bed. Part of it was because of the woman who broke her heart almost two years ago. Erica Hahn.

Callie had always been a flirt. It was just in her nature. Whenever she was around an attractive woman, that natural charm of hers' just poured out. And on most occasions, it worked. She met Erica while they were working a case together. The blonde was an F.B.I Field Agent that worked in the Miami Field Office. Callie was not attracted at first, but definitely felt a draw towards the blonde she could not explain. During off hours they began to get to know each other and within months they were in a relationship. Callie's first relationship where she vowed to be monogamous and really allow someone in her heart. Big mistake. The second things got too complicated, Erica just disappeared out of the blue, totally devastating Callie. From then on, the Latina swore to never fall in love again. She did not need a steady companion to settle down with. All that caused was pain.

That was in Miami. She had been in the Emerald City for a week now and her first day as a Seattle cop started tomorrow. The Latina was ready to take on anything. This of course included having her pick of Seattle's hottest women of the night.

The mysterious blonde sank her teeth into the side of Callie's neck, making the brunette wince at the slight pain. It hurt, but it only caused her aggression to build. The Latina added a third finger into the blonde and slammed the woman harder into the door. The blonde growled with pleasure as Callie plunged in and out of her wetness at a startling pace.

"Oh, yes! Oh, yeah… fuck me! Fuck me, baby!"

The blonde threw her head back and released multiple screams and moans as her body trembled and melted into white hot pleasure. It was the most intense thing she had ever felt in her life.

"Oh, my God…" she breathed. "That was incredible…"

Callie smugly grinned and pulled out of the woman, causing her to whimper at the loss. "Good," the brunette purred. Callie raised her eyebrows suggestively and looked into the blonde's glazed over eyes. "Now, where's the bedroom?" she asked in a sing-song voice.

The younger woman smiled and yanked the front of Callie's shirt, leading the Latina further into her apartment. Yes, Seattle definitely had plenty to offer so far.

Arizona walked through the police department with her usual chipper bounce of confidence. She was dressed in dark blue jeans, a light pink v-neck, and her badge hung from her belt. She wore her hair in loose curls, not necessarily neat, and very little make-up. She headed into the break room and made a beeline for the coffee pot.

"Hey, little lady," a voice sounded behind the blonde.

Arizona turned her head away from her task and smiled at the person in the doorway. "Hey, Teddy. Good morning."

"Good morning," the honey-haired woman replied. "You're in a good mood. So, all went well with Joanne coming over for the rest of her stuff last night?"

The blonde's smiled faltered slightly, but she soon covered it with an even bigger grin. "Sure, did. She is completely out of my life now."

"Good," Teddy nodded. "You deserve so much better than her."

Arizona finished pouring her coffee into her Sesame Street Elmo mug and leaned back against the counter. "Thanks, Teddy."

Her friend smiled lightly. "So, changing the subject… I thought you had a meeting this morning with the Captain."

"I do." Arizona glanced at the clock on the wall. "In about five minutes." She took a satisfying sip of her coffee. "Are working on any good cases?"

"Nah. Just some kids that robbed a pawn shop. Nothing big. You?"

Arizona shrugged. "Same, nothing big." The blonde took another sip of her coffee, enjoying the hot liquid running down her throat.

"What do you think your new partner will be like?"

The blonde smiled. "As long as he or she can back me up like Karev did, I'll be happy."

"Have you heard from Alex?"

"Yeah, we spoke last week. He said he's having a blast with his new job in D.C. and that he doesn't miss me at all."

"Oh, he did not say that," Teddy scoffed. "You and Karev were buddies."

Arizona smiled and nodded. "Yeah… I know, and I miss him. But I support him. I'm glad he's happy." Teddy smiled. "Welp!" Arizona announced, before downing the last of her coffee. "I'm off to meet the new partner." The blonde began walking out of the room.

"Good luck!"

Moments later, Arizona was knocking on her boss's office door. "Come in," Captain Richard Webber called from the other side.

The blonde entered and closed the door behind her. Arizona smiled softly at the Captain. Webber only eyed her over the rim of his glasses and gestured towards the chair in front of his desk. "Have a seat."

Arizona and the Captain's personalities were like night and day. However, Webber knew the blonde was one of the best cops he had working on the force.

"So, Robbins… as I'm sure you already know, today you'll be assigned your new partner."

"Yes, sir. I'm just hoping he or she can be as reliable as Karev was."

"It's a she… and I'm sure she will be. You might know her actually. You both trained at the same police academy."

"Really?" the blonde smiled, happy it might be one of her old pals. "Who?"

Just then, a knock sounded at the door.

"That may be her now… Come in!" Webber called.

The door opened and the sight of the woman that stepped into the room made Arizona's heart leap and her stomach do backflips. She had not seen this woman in over ten years and had practically erased her from her mind. Well, only practically… to her misfortune, she never had forgotten this woman.

"Arizona, this is Callie Torres. Your new partner."

A knowing smirk spread across Callie's lips as she recognized the name and face of the blonde staring wide-eyed at her.

Ten Years Earlier

Callie was 23 at the time and Arizona was 22. Both of them were considered top of their class recruits and were well respected by their fellow officers. The only problem they had was with each other. Arizona was a naturally friendly and bubbly person with anyone she encountered. Always spreading her positive energy… but there was something about Callie Torres that rubbed her the wrong way. On a daily basis, random, off-the-wall comments would come flying out of the Latina's mouth. It made everyone laugh of course, but the blonde found the jokes and comments completely annoying. For one, she could not stand how cocky the brunette was. But the real bitch was… the Latina had every right to be. Callie had skill, Arizona could not deny that.

After about a month of academy training, Arizona finally encountered Callie's arrogance first hand. They were teamed up together in the indoor shooting range one day. Both of them were wearing their protective goggles and hearing protection headphones.

Arizona was the first to shoot. When her target paper came back, showing the results of her shooting accuracy, Callie was not impressed.

"Wow, what were you aiming at? Step aside, Powerpuff girl," the Latina said, picking up a gun and taking the spot where Arizona previously stood. "Let me show you how it's done."

Arizona rolled her eyes and watched the brunette take aim. Of course Callie's shooting was remarkable and her target paper showed that she hit the bull's-eye with outstanding accuracy every time.

Callie turned to the blonde and grinned. "Now, that's how you shoot, blondie," the Latina gloated.

"Whatever…" Arizona murmured, trying to remain unimpressed.

She hated being called blondie. And what was with the Powerpuff girl comment? When she looked at Callie once more, she noticed the Latina's eyes were wandering down her body, obviously checking her out. "You've got to be kidding me…" the blonde drawled.

Dark brown eyes finally met her gaze and Callie smiled lightly.

Arizona was looking at her quizzically. "What are you doing?"

The brunette bit her bottom lip and slowly released it, letting it slide under her teeth. "Hey, you may not be a good shooter, but you're definitely hot." Callie shrugged. "At least you've got that going for ya."

Arizona's mouth dropped open. Insulted, did not even cover what the blonde felt in that moment. What right did this woman have to say these things to her? "I don't like you," the blonde bluntly stated.

The Latina raised her eyebrows at Arizona's words. "Um, wow. Tell me how you really feel."

"No, I mean it," Arizona firmly replied. She crossed her arms over her chest. "I normally find something to like in every person I meet, but you? You've got to be the one person on Earth I can't stand. Why do you have to be such an arrogant asshole?"

Callie smirked. "Are you trying to turn me on? Because it's working."

Arizona felt her insides burning with annoyance. This girl was out of this world. The blonde chose to ignore the Latina's comment and stood firm. "Answer my question."

The brunette sighed, seeing that she wasn't making any headway with this girl. "Look, blondie. If you can't even handle what I dish out to you, what are you going to do in the real world, huh? You need thick skin for this job. Maybe you're not even fit to be a cop."

Arizona removed her eye-wear and got in the brunette's face. No one questioned her abilities for the job she always wanted. "Oh, I've got plenty of thick skin."

Callie removed her glasses as well and stepped a little closer. They glared into each other's eyes. "Do you think you can prove that?" Callie challenged, with slight smile.

"I don't have to prove anything to you… Calliope."

The Latina's expression dropped upon hearing her full name. "What did you call me?"

"I said, Calliope. Is that not your name?"

The Latina seemed embarrassed and shifted her weight uncomfortably.

"You don't like being called Calliope?" Arizona teased.

"No, I don't…" the Latina hissed. "So don't call me that ever again."

Arizona grinned smugly. She had gained the upper-hand.

Upon seeing those prominent dimples on the blonde's face, Callie almost felt the anger inside of her turn to mush. She had never noticed those dimples before. They were… cute. The brunette blinked out of her thoughts and remained focused. "How did you know my name?"

The blonde scoffed. "Like I'd tell you." Arizona picked up her weapon from the small counter in front of them and then looked at Callie once more. "You're not so cocky now, are you?" the blonde asked, before walking away.

Callie's eyes followed Arizona and traveled down to the blonde's ass. The Latina smiled lightly. She liked what she saw as the blonde moved away from her in those tight, required training shorts. However, Callie knew a challenge when she saw it, and she would not be showed up by some blonde Barbie doll.

From that day on, it was war between them. They were competitive. And though they rarely spoke, both were always sizing themselves up against the other. Callie was a better shooter. Arizona was a faster runner. And they were both equals when it came to self-defense.

Along with their rivalry, the number one thing that bothered Arizona about Callie was her attraction to the Latina. Arizona had to sometimes slap herself whenever she found herself staring. Maybe it was the long dark hair, or the plump lips and dark chocolate eyes… and don't even get her started about that curvaceous body. She hated that she was attracted to a self-centered prick.

Three weeks before the eve of their graduation from the academy, Arizona left a note on Callie's bunk to meet her in the locker room. Arizona did not know what compelled her to do it, but she was the type that hated to leave things unresolved.

The Latina was curious as to what Arizona would possibly want, so she went of course. She entered the vacant locker room and passed a few rows. She found Arizona standing at the back.

"Alright, Robbins. To what do I owe the pleasure of this late night meeting?" The Latina smirked.

"I want to call a truce, Callie."

The Latina furrowed her brows. "A truce?"

"Yeah, a truce. We've been at each other's throats for months and I'm tired of this competition bullshit. Can't we just, finish training without taking jabs at each other?"

Callie took a few steps closer. "So, that's it?"

"What do you mean?"

"I don't know," the Latina shrugged. "I mean with all the obvious sexual tension between us, I thought you wanted to meet for a different reason."

Arizona frowned. "What?"

"Come on, Arizona. I totally saw you checking out my ass in the gym the other day."

A blush instantly rose in Arizona's cheeks but she tried to hide it by shaking her head in denial.

"Don't be embarrassed," Callie chuckled. "I'm hot… and so are you. I say we just bang it out."

Arizona scoffed in disgust. "You're unbelievable."

"Come on. Let's just get it out of our system. Right here, right now." The brunette stepped closer and was now within three feet of the blonde.

Arizona shook her head. "God, I can't stand you, Callie. I knew this was a mistake. You're so full of yourself."

"And your point is?" Callie asked, cockily.

"Urgh!" the blonde growled in frustration. "I can't talk to you." Arizona brushed past the Latina.

But before she could get away, Callie grasped Arizona's hand and spun the blonde, pinning her against the lockers with her body. Their faces are inches apart. "Then don't talk."

Callie swooped in and planted her lips against Arizona's in a soft kiss. The blonde's body tensed at first, but soon relaxed. Arizona tingled all over as she felt Callie's mouth on hers. When their lips slowly pull apart, Callie studied Arizona's face for a reaction. They stared into each other's eyes, both surprised by the feelings that coursed through them. They had both felt it. An electricity of physical chemistry that was more powerful than anything either one of them had ever experienced. It was addicting, and they both wanted more. Callie felt Arizona's breath tickle against her lips and she hesitantly leaned in again. Arizona could not believe she was letting this happen, but she was. She wanted it to happen. And she did nothing to stop it. Their lips met again.

This second kiss felt three times more intense than the first. Arizona moved her lips with Callie's, instantly flowing with the pace that the Latina set. She felt Callie's tongue attempt to enter past her lips. Arizona's arms snaked around Callie's neck and she pulled the Latina closer. Her mouth opened further allowing Callie's tongue to enter. Both of them moaned as sparks of arousal shot through their bodies. The kiss soon became hungry and more aggressive. Their tongues clashed, bodies began to grind against each other, hands were in each other's hair. They were like animals.

Callie slid her thigh between Arizona's legs, firmly landing it directly against the blonde's heated center. Arizona involuntarily gasped, thus making her realize what the hell she was doing. This had gone too far.

Suddenly, Callie was shoved away and a hard slap connected with her left cheek. "Ow! Jesus…" Confused, the brunette looked up to find angry blue eyes staring back at her.

Arizona was flushed and breathing heavily. "Stay the hell away from me, Calliope Torres," the blonde stated, before stomping away.

The Latina shook her head slightly, still surprised by the sudden slap. She rubbed her burning cheek for a moment and watched the blonde's retreating form. Arizona had totally kissed her back… and it was good. A small smile formed on the Latina's lips. It was way worth it.

During the last three weeks of training, they did not speak to each other nor look at each other. They graduated and never saw each other again.

Present Time

Captain Webber looked between the two women. "I assume you two know each other?"

Before Arizona could reply, Callie cut in. "Sure, we're old friends." The Latina looked at the blonde. "Right, Arizona?"

The blonde had to contain herself and bit back a smart retort. Instead she just gave a slight nod. "Right," Arizona replied, bitterly.

"Excellent," the Captain said. "Arizona, show Callie the ropes around the city. I want you two to get to know each other again. Because all you'll have out there is each other."

Arizona nodded. "Yes, sir." She stood to her feet and walked over to Callie.

Of course the Latina was even more beautiful than the last time she had seen her. Callie may look more mature, but Arizona could already tell from the Latina's demeanor, her attitude was still high school.

Callie finally got a good look at Arizona and noticed that the chipper blonde from the academy had certainly grown into a gorgeous woman. The blonde now stood in front of her and looked into her eyes. Callie could tell Arizona was not thrilled, but the brunette did not care. She loved a challenge.

"Come on," Arizona murmured, walking past the Latina, opening the door.

This was going to interesting.

A/N: So, what do you think so far?