u'know how netherlands' eyes are always like he's shocked and angry, as if he's seen something he shouldn't have seen? what if it's because of bulgaria?
so u'know how netherlands and the ottoman empire would trade, how they were allies at times and stuff.
this how I imagine it:
once upon a time, the netherlands had normal-looking eyes. one day, he was visiting his ally, the ottoman empire. they had important talks and stuff and some sort of a solemn dinner idk but eventually, it's time for netherlands to go to bed. it's summer and windows & doors are open in the night so it's bearable and not too warm.
as he's walking in the dark hallway on the way to his room, he hears someone talking in the very distance. it's in language he doesn't know.
'awkward' the netherlands thinks but he continues. dang, this is somewhere ahead of him.
as he walks, he hears SOUNDS THAT I'M NOT GONNA DESCRIBE cuz yeah
he gotta pass it by. he's gonna ignore it stoically. he gotta keep on walking.
the sounds become louder and louder.
as he passes by the room where the sounds are coming, he can't help but look for a second in that direction after a startlingly loud gasp.
AND LO AND BEHOLD, THERE HE IS.
a dark-haired guy doing U KNOW WHAT I WON'T WRITE IT DOWN with a cup of yogurt. (more like he's doing the cup of yogurt). he hasn't noticed the netherlands. but the netherlands has been frozen in place bc of shock and disgust and awkwardness and the surreality of the situation. cold chills spread across his body. his arms and legs tingle, unable to move. he can't turn his eyes away from the scene. finally, the guy in the room whimpers KISELO MLYAKO (whatever this is supposed to mean, the netherlands doesn't speak this language). seems like he's done. oh well now he's sitting in bed AND EATING THE YOGURT WITH A SPOON.
there's one thing the netherlands knows as the guy before him gorges on the yogurt: he'll never, ever eat yogurt. he will never look at yogurt the same way. NEVER, EVER AGAIN. a wave of sweat runs across him. finally, he's able to move. while trying not to hurl, he walks away carefully, so the guy doesn't hear him (and he's successful). he feels nauseous. sick. he staggers to his room. everything is like a dream, like he's gone half-numb. he can't fall asleep for quite a long time, and when he eventually does, the event he's just witnessed haunts him in his nightmares.
on the next day, he doesn't have breakfast. he leaves prematurely with eyebags under his eyes.
from then on, everyone would say he's changed, that he's very different from before. they don't know that every night, as he falls asleep, he goes back to what he's witnessed.
eventually, the netherlands found out that the guy with the yogurt was a nation and his name was bulgaria. this knowledge came in handy when bulgaria wanted to join shengen.