I think this is about taking a walk along a beach ("the shells crack under our shoes" and "I will race you to the waterside") with a girlfriend on a wintry day in Ireland. The "freezing speech bubbles" and "smoky clouds of laughter" are when you can see your breath in winter. He's describing how happy they are and declaring their love for each other "from the edge of Ireland shout out loud, so they could hear it in America".
I think it's at dusk and they can see the stars etc. She pauses before telling him that she loves him "the sea filled in this silence" and then he sees that she means it and how happy she is.
I think this is about taking a walk along a beach ("the shells crack under our shoes" and "I will race you to the waterside") with a girlfriend on a wintry day in Ireland. The "freezing speech bubbles" and "smoky clouds of laughter" are when you can see your breath in winter. He's describing how happy they are and declaring their love for each other "from the edge of Ireland shout out loud, so they could hear it in America".
I think it's at dusk and they can see the stars etc. She pauses before telling him that she loves him "the sea filled in this silence" and then he sees that she means it and how happy she is.