Tag to Internal Affairs, but very AU. First, Tony's undercover assignment is to befriend Jeanne, not romance her, and also a relationship that has been hidden is revealed under the intense scrutiny of the FBI.
Tony's POV
The most beautiful sight in the world? Abby at the end of a 52 hour shift dressed in my boxers and her tank top, hair pulled back into a messy ponytail, and face free of makeup. You know its love when you think she looks more beautiful like that than when she's dressed to the nines. Not that I don't think she's beautiful all the time – sure, she's not my usual type, but she's sexy as hell. All that black ink on creamy skin. And she's confident too. I like that in a woman. She's not afraid to voice her mind or be individual. She ain't scared of Gibbs either, a trait anyone would admire, except other people like her, such as Jenny, or Ziva, or Ducky. Or Colonel Mann. Probably why he shagged her. Likes a woman who can stand her ground. Like I do, I guess. Anyway, where was I? Oh right, how gorgeous and amazing my girlfriend is. Did I mention I love her? Of course I do. Had to be, before I went down that road. You know, cos of the whole Gibbs will put me six feet under thing. As far as I know, he still doesn't know. Then again, nothing gets past Gibbs. But I think if he knew, he'd make sure WE knew it. She's my best friend. Was before we started seeing each other. I have a weird feeling we're never gonna split, which is why I'm thinking of proposing. I came into work with a huge grin on my face this morning, and I delighted in pulling that hot-liquid-in-a-cup-but-actually-bits-of-paper prank on McGoo. Even the arrival of Gibbs didn't dampen my spirits. But something else did thirty seconds later.
Fornell. Announcing that NCIS was under lockdown due to the fact La Grenouille got himself killed. Interrogations and background checks for all.
All I can think is that me and Abs are screwed.
Abby's POV
I got scared, very scared when Fornell came down into my lab, instructed me to turn everything off and go to the evidence garage. When I asked why he told me NCIS was under investigation for the murder of Rene Benoit! I followed him to the garage, where Tony, Ziva, Timmy, and Gibbs were waiting. Jenny had already been taken for interrogation. I sat next to Tony and he slyly wrapped his hand around mine, squeezing it tightly to reassure me. I saw Gibbs' eyes flick onto our intertwined hands, but he didn't mention it. Tony was worried, I could see it in his eyes. Nothing was said, till an agent came and then left with Gibbs. It was like a spell had been broken and everyone began talking at once. Before long Gibbs returned, and this time Timmy was taken. An hour later, they allowed those who had been interrogated – Gibbs, Timmy and Ziva, to go home, which left me and Tony. His eyes met mine.
"What's the betting Fornell tells Gibbs?"
He let out a hollow laugh. There was no chance Fornell would keep shut.
She smiled and kissed him. The nervy FBI agent came back in, and collected her. Tony could only enjoy the view of her walking away, and enjoy it, 'cos he was pretty sure Gibbs would have killed him by the end of the day.