Their correspondence was never-ending. They were always writing small letters back and forth to each other, no matter what they were doing. Every morning, Tony would wake up and find a note sitting on his bedside table.
Went out for a jog. See you for breakfast?
Xoxo, Z
Tony would always smile to himself, studying her handwriting. Then he would get up and make breakfast for both of them. She would come back to their apartment and they would eat together and then he would get ready for the day.
When they were at work, they wrote each other little letters and notes. They had to correspond that way because they had to keep everything a secret. Nobody could know.
Tony would leave her notes in his own scrawled handwriting and surreptitiously place them on her desk as he left the bullpen.
The letters weren't special. His notes almost always said the same thing:
Ti amo, Z.
-T
After slipping the notes on her desk Tony would walk away for a minute before heading back to his own desk. Every time he walked back to his desk she looked at him and smiled.
The letters weren't anything special; they were just simple letters. Tony loved writing them, though, and he knew that the letters were bringing him closer to Ziva.