Lara's Note: Alright, here's the first possible ending to this fic. I have several more that I either had in the initial concept or were suggested to me in reviews. If you've got a different one, please feel free to let me know!
Peter stormed through the front door of the Petrelli mansion, shaking rainwater from his hair. "Mom?" he yelled. "Ma? I need to talk to you."
A muffled reply came from the back of the house. A few minutes later, Angela Petrelli appeared in the drawing room. "Ah, Peter," she said, sounding cheerful. "It's been too long since you've visited. I wish you would stop by more often. Your brother isn't very good company with the mid-term elections coming up in a few months..." Her words trailed away at the glowering look on her younger son's face. "Oh dear. I know that face. What is it, Peter?"
"Who is my father?"
Though she looked stricken, Angela managed to cover her shock. "Don't be silly dear, you know who your father is."
Peter glared at her. "You've been lying to me all my life, and this is just one more. Suresh did a DNA test on me, Mom. I know that Da- that Arthur isn't my biological father. Who is it?"
Angela didn't reply.
"Please. Tell me."
She sighed. "Sit down, Peter." He sat. "In my younger days, I was a... I was foolish, and I made many mistakes. I was... unfaithful to your father. Not that it really mattered, he strayed as well. But for a year before you were born, I was secretly seeing another man. I always wondered, but I was never certain, and so I never felt it prudent to say anything and worry you."
He didn't reply for a minute, but stared at his hands in silence, absorbing this new and troubling information. He had known it had to have been something like this, but knowing that didn't make it any easier to hear. "Who is it?" he asked finally.
"He was another founding member of the Company, a wealthy Japanese businessman who helped fund some of our early operations."
"What's his name?"
Angela sighed again. "His name was Kaito Nakamura."
"Was? As in--?"
She nodded. "Yes. Kaito is dead. He was murdered by Adam Monroe a few months ago."
Peter looked pensive. "Nakamura," he said slowly, thinking about it. "Did he...? Do I have a brother?"
Angela smiled. "Yes," she said. "Kaito's other son, Hiro. And a sister, as well. Kimiko, I believe her name is."
His mind was reeling. In a matter of hours, he had gone from being the younger of two brothers to having two brothers and a sister, and a father he had never known at all. All he could think to do was hurry wordlessly back out the door into the autumn squall and walk until he couldn't go any farther. Then, he pulled out his cell phone and, standing under the umbrellas of a sidewalk cafe, made a call he had a feeling was going to leave his phone bill reeling. Overseas calls were extremely expensive.
Tapping his fingers against his leg anxiously, he waited for the person on the other end to pick up. Finally, his call was answered. "Hiro? It's Peter."
The excited reply came as he had expected. "Peter Petrelli!" Hiro exclaimed. "It has been too long, my friend."
In spite of himself, Peter found himself grinning. "Hiro, listen, I have something I need to talk to you about... in person. Can you teleport?"
"No," Hiro said sadly. "Doctor Suresh tells me I should not use my power. It is... very bad for me."
"Alright then," he replied, making the decision instantly. "I'm gonna try and find someone who has some kind of... travel... power I can absorb, or I'll catch a flight to Tokyo."
The once time-traveler picked up on the note of anxiety in Peter's voice. "Peter Petrelli..." he said hesitantly, "What is the matter?"
Peter sighed, running a hand through his hair. "I'll see you in a few days, Hiro."
Three Days Later...
Despite extensive searching, Peter had been unable to locate someone with a suitable method of superpowered travel. So he had to settle for flying coach, and he was seriously regretting it as he hauled his suitcase up the stairs into Yamagato Industries. "Thank god for elevators," he muttered to himself. After exiting the lift, he hurried past the startled drones into the CEO's office.
Behind the imposing oaken desk, a familiar bespectacled figure was making paper airplanes. "Hiro?" Peter said hesitantly, announcing his presence.
The former time-traveler looked up from his intense folding session. "Peter Petrelli!" he exclaimed happily, leaping to his feet. "How good to see you!"
Peter couldn't help but smile. If he had to have a half-brother courtesy of his mother's affairs, there couldn't have been a better brother to have than Hiro Nakamura. "It's good to see you too, Hiro."
"What has caused you to come all this way? Is the world in danger?"
He shook his head. "No, Hiro. Nobody's in danger. Except maybe my mother. I'm seriously considering killing her." At Hiro's distressed look, Peter recanted. "I'm joking, just joking. But... there's no easy way to say this, so I guess... We're brothers, Hiro."
Hiro stared at him for a moment, mouth slightly open. "How can this be?" he asked.
Peter shrugged. "Apparently my mother had an affair with your- our- father, and, well, here I am."
The space-time samurai sat down very hard in his desk chair. "You are... my brother?" he asked.
"Yeah."
Hiro nodded slowly, taking the news in. Then he pushed his glasses up his nose, leapt to his feet and screamed "Yatta!"
"What?" he asked, surprised by his newfound sibling's reaction.
The time-traveler gave him a happy grin. "I always wanted a little brother!" he said.
Peter's heart sank as he realized that, yet again, he was the baby of the family. "Great," he muttered.