Summary:

How does the saying go again, When the Bat's away, the Birds will play? Close enough.

The Wayne brothers are in charge of Gotham City for one night, Just. One. Night. What could go wrong? Turns out the answer is a lot. A lot could go wrong.
After a freak mishap while out on patrol, Damian is concussed and taken back to the cave, where he accidentally reveals that he is not ten years old, he's only seven... and a half.

"How? It doesn't make any sense. Bruce was with Talia eleven years ago, right? Which would make Damian ten, right?" Tim states.

"Well that's usually how it goes," Dick replied while scratching his head. "Jay, did you ever see Damian when you were in the League?" He questions.

Jason groaned, "Ugh, my memories of the League are shot, man." He walked away to the stairs, "It was a long time ago."

Which it was. When he was there. Eight years ago. Crap.