"Tony, wait up, look I'm sorry, I couldn't help it." Kate yelled after Tony as he walked off to his car after work that day. She felt bad for telling McGee about his sister.
He just stood there looking at her with no feeling in his eyes. "Whatever, I'll see you tomorrow." He said getting into his car.
Before he closed the door she said that she wanted to meet this mysterious sister of his. He told her that she was going to meet him for lunch at noon, after her last class. "You're welcome to come with me if you want, Kate." the usual playfulness returning to his voice.
"Great, ok, well, I'll see you tomorrow." She said as she walked to her car.
That night Tony called his sister to tell her that he was bringing Kate with him to lunch the next day. She was excited to meet someone Tony worked with.
"How come I've never met any of them before?" She asked him.
"I didn't want to mix my personal life with my work life, I've done that and it didn't turn out so good." was the only response Tony could think of.
"So, this is Kate you're bringing. Wait, isn't she the one you like? Is this supposed to be a date, am I interrupting something?" She joked with him.
"No, it's not a date." He said, purposely not answering the first question. "We're not supposed to date coworkers."
The next day Kate and Tony drove to Amy's college to have lunch. They picked Amy up at her dorm because she had to change out of her lab clothes.
"Kate, this is my baby sister Amy. Amy this is Kate." Deep down inside Tony wanted to add "my girlfriend" to that, but he knew it would never happen.
"Its nice to finally meet someone my brother works with. He's told me so much about you and everyone else."
"Really?" Kate was shocked, and a bit upset, that Tony told his sister about them but never told them about his sister.
"Yeah, work was pretty much all we talked about when I visited. He couldn't wait to go back." She remembered all that Tony had told her about Kate, he was in love but Amy knew he would never admit it.
All through lunch they shared stories, Tony and Amy told stories from their pasts and Kate and Tony shared stories from work. Both Amy and Kate enjoyed hearing stories about Tony that they didn't know. Tony, surprisingly, didn't mind sharing all the stories. After that lunch Tony invited his sister to visit him at work whenever they could both find time. Kate and Amy became good friends after a few months and Amy met Abby, McGee and Gibbs when she came to visit Tony at the office. She was closest with Kate and Abby, who was closest to her age and Amy shared her interest in forensic lab work.