AU where the Justice League forms like usual, except Batman
maintained his “totally a myth” status and has in fact been active for years before the JL forms. He’s very
cautious about trusting them, but still joins, and the others sort of accepts
that as long as they trust that Batman has a really hard time with trust, it will
all work out in its own weird way

Then, one day, in the middle of a JL mission, the League gets
in a tight spot. Out of nowhere, this blue and black blur swoops in and saves everyone’s
ass. Maybe breaking some shackles that were proving very difficult, maybe disarm
a bomb that the League was just a hair’s breadth too slow to reach without
help, but whatever happens, the shadowy figure pauses just long enough to say, “Hey,
Batman, you know you there are these things called cellphones now and you can just call
sometimes, it doesn’t have to be this dramatic?” and bounds away after
shouting ‘let’s do brunch! Bring your new friends!’

Batman is mortified.

No one lets it go.

The entire rest of the mission, the whole League is asking so
many questions. Who was that? Do you know him? How do you know him? What’s going on? I didn’t know there was a
vigilante in this area?? They don’t let up until he talks.

“That was Nightwing.” Batman is mumbling. The JL forces him
to bring them to the Brunch. Brunch happens to be in a run-down apartment on
the edge of a bad neighborhood, at five in the morning, in costume. Nightwing
introduces himself as Batman’s lovechild with justice.

“I did not realize Batman had a child,” Martian Manhunter
says, calmly enough that no one’s sure if he’s accidentally plucking a really
loud thought out of the air or if he’s trying to make a joke.

Nightwing stares for a moment falling over laughing. He doesn’t
get up. Batman starts trying to apply anti-Joker venom but Nightwing just kicks
him and laughs until he cries. He keeps trying to wipe his eyes and his mask
keeps getting in the way, so he asks everyone to leave so he can please get
a hold of himself

He is still laughing when they leave. Everyone is confused.
Batman is furious.  Nightwing manages to
breathe long enough to say, “We’re just so glad
you’re socializing now, Batman.”

Superman turns to look at Batman very slowly. “…’we’?”

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