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I've seen a lot of Constantine mentoring Danny fics and prompts, and one of them had a random joke in the tags that John and clockwork had "history" and this immediately came into my brain
The justice league were sitting around the table, John Constantine sipping from his seemingly neverending flask and ignoring whatever the hell batsy was droning on about.
"Constantine" batman growled, "this is not a joke or a game, this is a potentially world-ending threat, pay attention"
"yeah, yeah, you got a ghost problem, do you even have a fuckin picture of 'em?" Ancients, whenever bats got on his high horse it was easier to go along with him, but he sure made it hard to like the fucker
Batman grunted and projected a staticy blurred photo of a young man with whispy white hair in a black Hazmat suit floating about a pond covered in transparent green blobs.
He couldn't contain his laugh as he looked at the photo "that's why you called this meeting? You think he's a world ending threat? Ha! Your little he'll spawn more of a threat than Danny"
Ok, so maybe it wasn't his best idea to provoke bats but seriously! This was a goddamn joke, kid wouldn't hurt a fly! Unless it was a ghost, but like, that's a ghost thing, fighting is how they make friends
"you mean you have met this entity?" Bats growled, tense and staring directly at john
"Yeah I've met him, he's my stepson" and oh, he /knew/ bats was gonna interrogate him to hell and back, but that stunned silence, the astonished aura? That was so fuvking worth it