This is a serious oneshot so America's easy going personality doesn't really fit so he's serious along with Japan. There is no yaoi in this!
"Japan, please!" America begged into the phone. His free hand gripped the edge of his desk, toes curled, he was on the edge of his seat, and his breath was caught in his throat as he prayed for Japan to come to his senses.
"No," Japan hissed from the other end. His voice was full of hate and disdain. He sat perfectly straight, besides the anger very evident on his face, he was a picture of calm. The map on his desk was the only hope America had to open Japan's eyes but they were blinded with denial and an intense fighting sprit.
"Japan!" America shouted desperation filled his voice. His eyes drifted onto the calendar on his desk the date August six circled in red. Closing his eyes he took a deep breath. "Please Japan, I have a weapon the likes of which the world has never seen before, so please accept the unconditional surrender." Much to his surprise he was able to say that calmly.
"And what is this weapon?" Japan retorted, believing America was just bluffing.
America was silent and Japan was proud of this. The western personified nation really wanted to tell his enemy but he couldn't betray his country men like that, after all his boss decided on that option to spare many American lives.* He looked over the papers scattered on his desk, reports on how the War on the Pacific was going and his resolve strengthen.
"Japan, I'm not bluffing. This is my last warning." The sound of the dial tone was his reply.
Slowly he hung up the phone. It was dead quiet to him as he stared at nothing. Before long reality sank in, Japan had refused and was still planning to fight. He buried his face into his hands and his body shook, terribly, as he fought against the tears. The ticking sound of the clock, on his wall, became dreadfully unbearable and he threw a thick binder at it to silence it but of course that didn't work. Cursing briefly he picked up the phone with his trembling hand and slowly dialed.
It rung a few times before finally the other end picked up. "Tell the president…Japan refused…" America spoke quietly, a single tear slide down his cheek. Sure, he and Japan never got along, especially in recent years, but he would never wished this even on his worst enemy.
...
"Sixteen hours ago an American airplane dropped one bomb on Hiroshima…*" the radio droned on but America wasn't listening. He sank deeper into his chair starring into space. The room was dark, the clock was gone, and his only comfort was the bottle scotch, he was drinking.
"I warned you," he mouthed before taking another sip. His mind was blank because he couldn't bare what him imagination could conjure on what Hiroshima must have been like right then. He was sure of one thing; it was probably far worse than anything he could think of.
1) The title, "Little Boy" is the name of the uranium bomb that was dropped on Hiroshima on August 6, 1945. It is estimated that 100,000 people were killed when the bomb was first dropped and many more died afterwards because of the radiation. Fat man was the plutonium bomb dropped on Nagasaki.
2) It was calculated that if the United States had invaded Japan 100 million American lives would have been lost and many more Japanese. Weather you believe this or not, is up to you, but I do because if you look at the static of the Battle of Iwo Jima and Okinawa it isn't to hard to understand that conclusion.
3) "Sixteen hours ago…" That is the beginning of Truman's speech following the first bomb. He had written the speech the night before but because he didn't know what time the bomb would be dropped he left the time blank right until he gave the speech. By the way, the plane that dropped both bombs was name Enola gay named after the pilot's mom.