Just an idea I made up... obviously... same old same old, let me know if you want more:)

Booth walked back into the Jeffersonian to pick up Brennan for dinner. They had just solved another case, and it was tradition. When he saw that she had already finished all the paperwork and was getting ready to leave, continued his merry way. He enjoyed spending time with her.
“Ok, Bones, what’ll it be tonight?” Booth asked her happily as he walked into her office. “Sushi, Tai, Pizza… have I ever reminded you about how good you’re mac n’ cheese is?” he stopped when he realized that there was no answer. “What?” Brennan looked like she was working up to an apology. Booth paused. “No, don‘t tell me…”
“Sorry Booth, I can’t tonight, I have a petsa with Andrew”. She didn’t look sorry. In fact, she looked quite pleased, though her expression changed as soon as she saw Booth’s crestfallen expression.
This was the last straw, and she hated to see him behave like this “I don’t see what you’re problem is, am I not allowed to have a outside of the lab?” she said, nearly shouting as she began to feel angry. What did he care what she did with her life?
“Bones, before I came along you‘re life was the lab!” he defended himself, but he realized he had crossed a line.
“You don’t know that, Booth”. That hurt. She stood up.
“Bones, I just don’t think it’s a good idea to go out with you’re boss!” Booth was nearly shouting too.
Brennan was extremely annoyed “Oh, so who is a good idea for me to go out with, you?”
There was silence. Booth looked at her as if he were about to answer, shook his head and left, leaving Brennan standing there, confused. What had she said?