Well, naturally their paths would cross at some time during the Devotion festivities. Hardly a day went by where they didn't, spending more time locked to each other's sides than everyone else combined.
"Robin!" Chrom calls, wearing the same silly smile as always.
"Chrom," she answers in kind, eyes alight from the way his very presence makes her reflect how he shines. She pauses her step and holds the tome she carries (now pinching a few cute little cards between pages) to her chest, "…Happy Day of Devotion!"
"Y-yes, same to you!"
They stand there, still and staring. The moment wraps them in ribbons, begs for something more. But what else is there to say or do for someone so important to one's life, yet not a DEVOTEE? Robin closes the distance, and settles a palm upon his bare shoulder, almost in acknowledgement - fealty - to the mark there. She can feel him stiffen. Perhaps… just a peck on the cheek would be appropriate for a prince? Yes, and then they could go on with their day and separate dates.
But just as she leans in, the next person is already calling out their greetings - shouts and waves their arm. In all the commotion, Chrom can't help but turn his head to look over, leaving Robin's lips to smack against the shell of his ear. A mouthful of cobalt hair puffs back out of her mouth with a pwuh! The air tickles his canals and whips his head right back around, along with an arm moving on instinct to shoo away the source. Which means backhanding Robin in the face.
"Augh…!" Fingers snap up to soothe where a cheekbone stings.
"Gods, Robin …I'm sorry!"
"No it… it was my fault. That didn't quite go as I planned."
"Well, at least it wasn't a battlefield blunder in that case. Ha… ha?"
"Er, yes… right." Why did she even want to kiss this man again?
They settle for a hug instead.