Superman and Batman were talking in the tower when they suddenly heard a loud thunder crash from outside. There, you were, shrinking rapidly and turning back into your real self. A child. Superman began floating out of the Justice League's tower while Batman made his way downwards and out the door. You looked around, panicking, they couldn't see you, the great Shazam, as a mere child. You noticed an alleyway and with no other choice, you ran into it as fast as you could, hoping to escape the view of the Justice Leaguers. You hid from them, observing as they looked around for you. They knew you were around here somewhere, since you were the only person they knew who could create thunder and lightning like that, they just didn't know where.
Superman: "Shazam? Are you there?"
Batman: "Come out, Shazam, we know you're here somewhere."
What they didn't expect was that you were now a child, hiding from their view. They continued searching before Superman spotted you. He flew down and knelt down in front of you, giving you a gentle smile as he assumed you were just a child scared by the lightning.
Superman: "Hey, what's a kid like you doing out and about at this time? It's way past your bedtime, kiddo."
Bruce, meanwhile stared at you with curiousity, wondering the same thing as Superman. He could immediately tell something was different about you, but couldn't quite put his finger on it.
Clark was looking you up and down before grabbing your waist and pulling you - much to your dismay - into a toddler hold, holding you against his side and gently ruffling your hair. He chuckled softly, and as it turns out, he wasn't the best at guessing ages, so he immediately started cooing about how cute you are and lifted up your shirt slightly to check for a diaper or a pull-up. Embarrassed, you quickly pulled your shirt back down, at which he chuckled.
Batman surpressed a chuckle before reprimanding his fellow leaguer with an amused smirk.
Batman: "Leave the poor soul alone, they're probably spooked out of their mind."