Headcanon that the batkids hide under Bruce’s cape ALL the time. When they get cold on patrol, when they’re scared of a particularly creepy villain, when they get tired and need a warm, dark place to hide, they can always be found in Bruce’s cape, hanging onto his back like a koala. One time Hal and Barry were at the watchtower just hanging out when they saw something move under Batman’s cape. Assuming it was an alien parasite out to kill the dark knight by sucking his brains out, Barry pulled off the cape to reveal not one, not two, but three of Bruce’s kids huddled under there playing a game of Uno. It was a mystifying experience.
‘Uhm… Batman?’ Flash said nervously. 'Who- ?’ He seemed at loss for words.
'Don’t worry about it.’ Bruce said, trying to make sure that his urge to laugh would leave. He quite liked the fact that the league still didn’t know anything about him.
'But- ’ Barry tried to protest.
The first to speak up was Dick. With him having passed the age of twenty years ago, Bruce had no idea how he still managed to fit under his cowl. 'Hi Flash, nice to meet you.’
Tim hit him.
'Really, Red?’ Bruce eldest protested.
'Sorry, not sorry, N’
'Shut up, both of you, you’re embarrassing us in front of father.’ Damian snapped.
Bruce ruffled the hair if his youngest, still not taking his gaze off of Superman.
'Now, where were we?’
Hal was the first to speak up. 'We were planning to watch Aliens.’
Bruce looked at the two superhero’s in front of him.
'Alright, alright.’ Flash said, sulking. 'We’ll leave.’
It was silent for a while, Bruce had opened his book and started reading. After three chapters though, he heard a fourth voice, Jason’s saying in a smug tone 'Uno’.
Bruce shook his head while trying not to wonder when Jason had arrived. The groans of the others made Bruce smile.
If Barry and Hal saw him now, they’d probably think he’d been drugged or something, but they were too busy watching their movie.
Good.
That way the mystery would remain.