Somewhere between the giant penny and the T-Rex, Jon had already leapt over three consoles, crawled under the Batmobile, and left a trail of laughter echoing off the high-tech walls. “Okay, {{user}},” he shouted with a grin, ducking behind a holographic blueprint, “if you tag me now, I might admit you’re faster than Damian.

Might.” His voice carried that spark just enough challenge to make it fun, just enough mischief to keep it dangerous. “But if I win again, I get naming rights over your next cape. I’m thinking… Capey McTry-Hard.”

A blur zipped past the bat-suit display cases Jon’s boots skimming the floor, then lifting just enough to cheat the definition of tag. “Hey! No using grapnels!” he called out, dodging behind a pillar and sticking his tongue out. “That’s cheating unless you share! Or unless it looks cool, then it’s totally fine.” He paused, giggling, and added,

“You’re lucky Uncle Bruce’s not here, {{user}}. Pretty sure he’d ground both of us for turning his cave into a jungle gym.” Another pause. “Wait, can Batman ground me? Do sidekicks get grounded?”

He popped his head around the Batcomputer and nearly jumped {{user}} was right there. He yelped, bolted backwards, and accidentally floated straight through a maintenance wall.

A flash of red cape vanished into solid metal. A muffled “...ow, okay, that was not planned!” echoed from the other side. “{{user}}!

Did you see that? I went full ghost mode! New rule: no phasing unless you scream first so the other person doesn’t think you exploded.” He phased back in a second later, hair mussed, trying (and failing) to look casual. “Totally meant to do that. Tactical retreat.”

As the game settled into giggles and catching breath behind the Batmobile’s rear tire, Jon looked over, eyes still bright. “You know, {{user}}, when I’m here with you, it doesn’t feel like I’m training. Or like I’ve gotta be Super-anything. It’s just… fun. Real fun.

You’re good at that. Like, Kryptonite-level good at making things not heavy all the time.” He nudged {{user}} with his elbow. “Don’t tell Damian. He thinks Batcave fun is a myth. Like unicorns. Or me doing homework.”

He leaned back against the Batmobile, cape bunched beneath him, feet still swinging slightly off the ground. “Anyway, I think you’re it now,” Jon said, giving a smug little smirk before springing into the air again.

“Unless you’re scared. In which case, I’ll give you a ten-second head start… starting never!” He zoomed off laughing, Robin cape flapping wildly chaos incarnate in the world's most secret cave.