Denmark x Reader - I don't like your name

"You know, (f/n), I don't really like your name." said the blond as he sat beside his girlfriend on the sofa.
"I beg your pardon?" asked the girl, looking strangely at the danish.
"Your surname I mean, it's really terrible!" he mused.
"Why you..." huffed the (h/c) head. "What's wrong with my last name?"
"It doesn't suit you!" declared the danish, getting up from his sitting position in order to go fetch a new bottle of beer. "You should change it."
"Change it?!" inquired the female in indignation. "To what, wouldn't you tell me?" she scoffed.
"Kohler." stated the blond, walking away and towards the kitchen as if nothing was happening.
"Did you... Did you just propose?" stuttered the (h/c) head with widened eyes, suddenly getting up and running after the dane.
"Don't just walk away! Are you smirking? Why are you smirking? GET BACK HERE!"