I'm pretty sure this has been done before (and several times), but brain going brrr, so

DPxDC John Constantine's How To: Ghost Kids

Bruce doesn't even get to say anything when the door to his study opens with a slam against the wall, and before he knows it, he gets an armful of kids. As in, a bouquet of them.

"I'm so done," John Constantine breathes out, raspy and exhausted, looking like a trainwreck incarnate. Granted, the man always looked like one, but right now, the effect has been greatly worsened. The dark circles under John's eyes are, in fact, black, and it looks like he hasn't shaved in at least a week.

Bruce looks down to the small gaggle of children in his lap that he caught in his hands by sheer reflex.

All three of them look up at him with identical, sky blue eyes. They could be twins if it was not for their obviously different ages - the girl looks no older than three, while the boys are probably around five and six.

The older boy scrunches his nose. The girl pouts, but it looks directed at Constantine rather than at him.

Bruce looks back to John, a silent question in his eyes.

"They are- Well, not mine, for starters," the man begins, placing his hands on the table right over the sheets and documents, and leans on it, hanging his head down. Then, he raises one hand up and waves it in the air, "Not yours either, thank the Gods for that." He takes a deep breath.