This was originally a one-shot but I got an idea which I think fit. Enjoy

Ziva cursed in Hebrew as her phone rang in the early hours of Saturday morning. She knew only one person would ring at this time in the morning, Gibbs with a case. Unfortunately Ziva had yet to have any sleep that night due to the delightful surprise Abby had sprung on her once they had got back to her place that evening. They had been together for a couple of weeks now and the time they spent together was amazing. Realising that ignoring the call would only result in a pissed off Gibbs, Ziva answered the call.

"Got a dead Marine upstate, get your butt down to headquarters now. Oh and tell Abby her other talents will be needed in a few hours." With that Gibbs ended the call.
"I have to go." Ziva said sadly as she started to pull on her clothes. "There is a dead Marine somewhere upstate, it will take us some time before we can get the evidence back, get some sleep before you go in." She pulled Abby into one last passionate embrace, kissing her deeply, before turning to walk out the door.
"I will miss you, see you in a few hours." Abby set the alarm then snuggled under the sheets which still smelt of Ziva for a couple of hours of sleep.

Even with Gibbs driving Ziva had dropped asleep in the back seat within minutes of them setting off. McGee wondered how on earth she managed that. She even looked peaceful. It seemed Tony's thoughts had turned in a similar direction when he piped up from the front seat.
"Ziva's out for the count. She's not even snoring. I guess Abby must be wearing her out."
"DiNozzo!"
"Sorry Boss, forgot you don't like the visual. Can we crank the heating up it's freezing tonight?"
"Go ahead."

The increased warmth in the car made even McGee and Tony drowsy and they settled into a comfortable silence broken only by the occasional sound of squealing tyres. With Tony in the car the silence didn't last for too long, he raised his head sniffing.
"Can you guys smell that?"
"Smell what Tony?" McGee asked rousing himself.
"I don't know, it's sweet and kinda familiar. I wonder if someone spilt something in here." Tony sniffed again. "I think it's coming from the back."
Gibbs remained silent he knew that smell and he really didn't want to think about where it was coming from. McGee sniffed carefully.
"Yeah I can smell it and your right it does seem to be back here. I hope I'm not sat in anything." McGee continued sniffing around the back seat until his eyes went wide having found the source of the smell. "Erm Tony...the smell is coming from Ziva!"

"What!" Tony's exclamation accompanied by a particular savage manoeuvre by Gibbs were enough to wake the sleeping Israeli. She sat up and looked round sleepily. "Oh God! I know what that smell is." Continued Tony. "It's Caff-pow!" Ziva sat bolt upright on hearing that, her memory replaying the surprise she had received from Abby hours earlier. Abby had produced her favourite beverage then proceeded to paint Ziva in the cold slush, even pouring some directly into convenient places before removing every trace from her body with a very talented tongue. Clearly she hadn't removed every trace as now in the hot car the smell of what remained was fairly prominent. A slight blush covered Ziva's cheeks, it took a lot to embarrass her but the details of her relationship with Abby seemed to be immediately know by her colleagues again.

Tony had pulled out his phone and was waiting for someone to pick up. It quickly became clear who. "So Abs, you've taken your addiction into the bedroom now?...You know what I mean this car reeks of Caff-pow...If you drink that stuff at night you'll never sleep...Abby! I think of you as a sister. I didn't need a description that graphic...Okay it's my own fault...We haven't got there yet so I still have a few more hours to torture Ziva before we see you...Alright, alright tease not torture...Bye Abs."

Tony turned in his seat and leered at Ziva. "Is it always this kinky with you two? I mean first the bites and now she's using you as a beverage container...oooowwww." Tony rubbed the back of his head.
"What did you say earlier about me not liking the visual? Now turn the heater off and crack your window. This car stinks." Gibbs commanded.
"Sorry Boss but why my window, she's the one that reeks?" Gibbs just looked at Tony.
"Okay Boss."

Ziva settled back to sleep to again dream about the earlier activities that had been so cruelly interrupted while the three men in the car tried to think of anything else.