What if all the countries hadcapital brothers and sisters? This begins in '39 at the beginning of WWII. Rome and Berlin were shipped to Poland to a bomb shelter built for them, specifically, so only they and some security people were there, as well as political scientists and economists to inform them on the progress of the war. BTW, Kiku's sister capital Tokyo is staying in her home county, since it'd take numerous plane stops to get to Poland from Japan, therefore making her vulnerable. They meet after the war, though.
Disclaimer: I don't own the world, nor Hetalia.
"Berlin, this is Rome. You're allied to her now. She's Italy's capital sister."
"Cioa," A very perky girl with red-brown hair and brown eyes smiled, waving energetically. So this is who I'm to share a roof with for the duration of this war?
"Gutentag," I said gruffly, crossing my arms over my chest. I sized her up. Green sun dress. Bows. Overly happy smiled. God, this girl is gonna kill me.
That night, I settled into bed in a tank top and long bed pants. There was a knock on the door. When I opened it, Rome stood there in underwear and a large shirt. I crossed my arms, looking sharply at the shorter girl.
"Yes?"
"C-Can I sleep with Berlin tonight? I'm scared to sleep alone."
"Rome, go to your room," I sighed, massaging my temples.
"But I'm scared!"
"There's nothing in your room."
"You don't know that."
"I- Well-" I sighed. "Fine." I turned and went into my room. "Don't touch anything."
"Okay!" I laid down and she laid against my back. I scooted away and she rolled onto her stomach with a huff. "Good Berlin."
"Go to sleep." I heard her soft breathing and drifted off myself. When I woke up, I was on my back, and Rome's head was resting on my shoulder. I moved her head off of me and got up, getting into my usual military issue clothes identical to brother's. I slicked my long blonde hair into a ponytail and then woke up Rome. She just muttered "pasta" and then went back to sleep.
"Troublesome," I muttered.
Over the next 3 years, we continued this pattern. We became friends, though she annoyed me so much. We matured to what might be around 16.
"Wow! Berlin, your boobs are getting really big!" Rome said in amazement. I looked at her in shock and then blushed, looking away.
"That's not something you just blurt out, Rome!"
"Mmm? But it's a compliment. I wish I had big boobs like that. Mine are still so small." She poked her breast, frowning and I blushed further.
"I think yours are a good size. Mine are so heavy and troublesome."
"Really? You like me boob size?"
"Hey now, I didn't say that!" She laughed. I turned dark red.
"I like it when you blush," she smiled, cupping my face. "It makes Berlin super cute." I looked at her. She met my eyes. I leant forward and kissed her. She wrapped her arms around my neck and mine found their way around her waist. My tongue found hers, and the two danced between our mouths. She moaned. When we came up for air, a strand of spit hung between our mouths. When it settled on her chin, I wiped it off with my thumb. We stared into each others eyes.
"Berlin is also a very good kisser."
"So are you," I chuckled breathlessly.
"Do you wanna kiss again?" I leaned my head forward and met her lips again.
This became a habit. We kissed a lot, but not much more than that. Some times we'd touch each others boobs or something, but clothes never came off. We said that we loved each other, and we held hands some times, so I guess we'd be classified as girlfriends. But that's okay, right?