Title: The Best of You

Rating: FR-18 (for mild sex and foul language)

Summary: An evening workout in the NCIS gym takes an unexpected turn for Tim and Ziva. Will the tryst throw the entire team into chaos?

Pairings: McGiva and Tiva (you can call it McTiva – but there's no threesome involved).

Notes: Written for the "McRomeo Love Triangle" challenge.

Chapter 1

"Are you prepared for pain, McGee?" Ziva asked as she circled the wrestling mat in the NCIS gym. Tim was opposite her, ready to pounce. They'd been meeting weekly to work out together.

"Is that supposed to make me nervous?" he said with a sly grin.

"We shall see."

They lurched forward at each other. Ziva swept Tim's leg out from underneath him. He lost his balance and felt. She pinned him down flat on the mat.

"That was easier than I thought," Ziva said. Tim wrapped his legs around her waist and turned the tables, slamming her to the mat on her back.

"I've got moves," Tim said as he sat on top of her, holding her down. He locked eyes with her just then. The distraction of her beautiful eyes was just what Ziva needed, and she flattened him to the mat and pinned him.

"I win!" she said triumphantly, still straddling Tim. Suddenly she felt herself careening toward the mat. Seconds later, Tim was on top of her.

"You deserve a prize," he said, his voice suddenly filled with lust. Before he could lean down and kiss her, she grabbed hold of his T-shirt and pulled him down on top of her, crushing his lips against hers. Pants were shed as they rolled around on the wrestling mat, grunting ferally as the sexual tension between them was released. They only met in the NCIS gym once a week, and this was the first time the evening had ever ended like this.

Ziva collapsed on top of Tim as they finished, and tried to control her breathing. She kissed him one last time before sitting up and reaching for her pants. Tim did the same, and they cleaned up the exercise equipment and headed for separate showers.

Tony jogged down the stairs toward the NCIS gym. He'd decided it was time to lose some weight, and what better time to start than now. As he neared the door to the gym, he heard noise coming from within, and it didn't sound like the traditional sounds of exercise. Smirking, he peeked through the window, and dropped his bag in shock. Tim and Ziva were on the mat, in the throes of feral sex. Tony couldn't believe his eyes. He picked up his bag and turned away. He could feel his heart ripping in two as he turned and slowly walked away.

NCISNCISNCIS

The next day…

Tim arrived a few minutes late to the office. He was shocked to find Tony already at his desk, hard at work, for a wonder.

"Morning, Tony," he said jovially.

Tony only grunted in response.

When did he turn into Gibbs? Tim thought to himself as he sat down at his desk and powered on his computer for the day. The elevator dinged, and Ziva arrived. Tim glanced at her as he waited for his computer to boot up. Could it be possible for her to look any more gorgeous? He turned his attention back to his computer as an IM popped up on his screen.

: Put your eyes back in your head, McGee.

Tim looked up at Tony. Why was he being so defensive of Ziva all of the sudden. He wrote a message back.

: I'll ogle any woman I please.

Tim suddenly heard a commotion at Tony's desk. He looked up in time to see Tony's pencil holder go flying from his desk, scattering pens and pencils all over the floor. Tim turned back to the instant message.

Timothy,McGee: Are you feeling all right today?

Tony,DiNozzo: Not as good as you, I'm sure.

Tim sat back in his chair, not sure what Tony meant by that. He quickly formulated a response and typed back.

Timothy. McGee: I'm feeling fine, Tony. No better than usual.

: Sure you are. You were fine enough last night to fuck Ziva in the middle of the gym. Where are you guys going to do it next?

Tim was about to type a response when Gibbs entered the squad room, cell phone in hand.

"Dead Sailor in Anacostia," he announced. "Gear up."

Tim closed the instant message and picked up his bag. Tony shoved him as they both tried to pass through the space between their desks. Tim stumbled and dropped his bag, the contents spilling onto the floor.

"Better me more careful, McGee," Tony said as he made his way to the elevator.

"That was rude, Tony," Ziva said, kneeling to help McGee pick up the contents of his backpack.

"Is anyone coming to the crime scene?" Gibbs asked sarcastically as he waited impatiently by the elevator.

"Just a second, Boss!" Tim called as he finished putting everything back in his bag. He zipped it snugly.

"You have ten seconds," Gibbs said. Tim just made it to the elevator in time. He didn't see the glare Tony was giving him from behind.

NCISNCISNCISNCIS

Tony was quiet the rest of the day. He reserved his voice only for when Gibbs asked him questions, and when asked to work with one of his teammates, did so silently. Gibbs noticed his behavior, but decided not to call him on it just yet. He decided he'd observe a while longer.

On the way back to NCIS, he put Tim and Tony in the front seat, and Ziva rode in the back. Tim sat awkwardly between Tony and Gibbs, looking angry and worried at the same time. Tony stared out the window glumly, not saying a word.

When they arrived at NCIS, Tony was the first one out of the truck. Gibbs put a hand on Tim's arm, stopping him from getting out behind Tony.

"Do you have anything you want to tell me, McGee?" Gibbs said.

"No, Boss."

"Why isn't DiNozzo speaking to either of you?" Gibbs asked.

"It's personal," Tim said quickly.

"Get it straightened out."

"Yes, Boss."

Gibbs let Tim's arm go, and he scrambled out of the truck and ran after Tony. He caught up with the SFA as he was walking toward Abby's lab.

"Tony! Wait up!" Tim said, running to catch up with him, He fell into step next to Tony and put a hand on his arm. "We need to talk—"

Tim was silenced when Tony punched him in the face. He went down in a heap, holding his face.

"How could you sleep with her? You know how I feel about her! You've known for years!"

"It didn't mean anything! I swear!" Tim shouted Tony yanked him to his feet and shoved him into the wall.

"How could you have sex with one of your best friends, and stand there and tell me it didn't mean anything!" Tony punched him again, drawing blood from the corner of his mouth.

"DiNozzo! Stand down" Gibbs' voice rang out as the team leader bolted down the hall toward them. Tim took the opportunity to take a swing at Tony, hitting him square in the jaw. Tony stumbled backward as Gibbs arrived. He grabbed DiNozzo by the arms to hold him back from going after Tim again.

"Someone better start talking."

TBC…