It's her dad that interrupts them in the middle of their argument, eyebrows raised at them both.
"What's going on?" he wonders, and Emma and Killian only look at each other for a split second before starting to plead their case to David simultaneously. He starts waving his hands in the air just seconds after. "Whoa, I can't hear if you're talking at the same time."
They both turn quiet, stealing glances at each other as they wait for David to continue.
"Emma, what is going on?"
She smirks at Killian, doing all but sticking her tongue out, obviously pleased she's talking first. "Killian claims he's taller than me."
David starts laughing. "That's what you were arguing about?"
"Yes!" they reply at the same time, and David bites the inside of his cheeks to stop laughing when he sees they are serious.
"Okay, well there's an easy way to settle this. Back to back," he orders, and they both obey immediately; he starts measuring with his eyes, putting a hand on both of their heads to be able to see it better and is actually surprised to find that Emma is taller.
He's about to say as much when he looks down at their feet, and sighs. "Emma, you're not allowed to stand on your toes."
Killian snickers. "Does that mean I'm taller?"
"It does."
Killian does a small victory dance that makes David grimace, before he sweeps Emma up in his arms and does a twirl with her there, pressing his lips against her for a kiss. Emma laughs, all anger seemingly gone, and David finds himself wondering if people find him and Snow equally nauseatingly cute to be around.