Serbia: That little jerk was responsible for killing my people in Jasenovac when he embraced Nazism,for attacking me even though he won his stupid independence through referendum and expelling around 200000 of my people in Republika Srpksa. I'm surprised that my father didn't disowned him already.
Croatia: That bastard came to me in my darkest over, promising me sorting better, a union where we would be in equal footing. But I later found out he was no better than Austria and Hungary. He criticized my religion, my customs, my way of living as too "Germanic" and not "Serbian" enough. And he wonders why I even sided with Germany to begin with. Then the second time, he tried to kill me, to make sure that my people continue staying at his place and continue being his slave. I'm surprised he didn't treat me the way he treat Bosnia oh so harshly.
"Except you..." both countries seethed and shacked with sadness and anger "May you rot in Hell...", before they slammed the photo at the desk. they can't forgive each other.