Tadashi sat numbly outside of the emergency room. Shouts rang throughout the room, the clatter of feet as people rushed by, the wheezing coughs and weak moans from other patients surrounded him. He paid no attention to it, the noise fading into the background. His hands trembled as he stared at them. Bile rose in this throat, choking him. The words he had heard just hours ago still rang in his head.

'Mr. Hamada? I'm sorry but there's been an accident.'

Abandoning everything, Tadashi raced toward the hospital. His father had been pronounced dead at the scene, his mother had passed shortly after arriving at the hospital and Hiro…

His heart clenched and squeezed. Tadashi didn't divert his attention from the locked emergency room before him. Every possible scenario played out in his head, always arriving at the worse one.

"Please not Hiro," Tadashi prayed. Don't leave me alone.

"Mr. Hamada?"

Tadashi's heart skipped a beat. Despair sank into his stomach as the doctor approached him. Please please please let Hiro be alright.

"I'm sorry for your loss," she said in a kind voice.

"My brother?" Tadashi asked. His palms felt sweaty as he dreaded the answer. He pleaded to every god he knew and then to the universe above.

The doctor gave him a warm tired smile. "He will be fine. He's quite the fighter."

Relief filled Tadashi as he slumped in the chair. He exhaled deeply, feeling the knot in his stomach untangle. At least, at the very least his brother was still alive.

"Thank god."

xXxXx

"TADASHIIII!"

Tadashi jumped, dropping the wrench he had in his hands. "Oww!" He yelped as the wrench had landed on his foot. Cursing darkly under his breath, he darted up the stairs to Hiro's bedroom.

"Hiro?" Tadashi flipped on the light to find Hiro tangled in his gray striped blanket. Tears streaked down the small boy's face.

"Hiro, it's just a dream," Tadashi said softly, gathering his brother into his arms. Four months later and the nightmares had yet to subside for Hiro. His younger brother had been lucky. Hiro had left the accident with only a broken arm and a nasty cut across his torso. The cast around his brother's arm had only come off last month ago, but the mental trauma was nowhere near healed.

"It's okay, Hiro," Tadashi soothed, rocking his trembling brother. He felt weary like the weight of the world was pressing down on his shoulder. Rest no longer came easy and between his classes, homework and taking care of Hiro, Tadashi was barely functioning. Luckily, his parents had the foresight to plan for their deaths and majority of the bills was paid from a trust fund, allowing Tadashi to finish his schooling. His professors had understood, his friends had been a huge help and Tadashi's genius brain filled in the rest.

Coaxing Hiro to sleep was honestly the hardest part each day for Tadashi. Whenever Hiro fell asleep the memories of the car crash would come rushing back at him. It made Hiro a monster at night, a trying experience to sleep to get him to sleep.

"Do you want to talk about it?" Tadashi asked softly once Hiro stopped shaking.

Hiro peered up at his older brother with wide eyes. Tadashi could see dark memories just lurking beneath the surface. His heart ached that his brother was so troubled. Perhaps the therapist Wasabi had suggested was a good idea.

"No," Hiro eventually decided, choosing to bury his face back into Tadashi's chest, seeking comfort from his older brother's presence.

Knowing sleep would not return back to Hiro anytime soon, Tadashi picked his brother up and carried him down into the kitchen. "C'mon bonehead," he teased lightly. "What do you say about some hot chocolate?"

Hiro's bight glimmering brown eyes said it all.

xXxXx

"Aww, he's so cute!" Honey Lemon cooed.

Hiro flinched and tightened his vice grip on Tadashi's pants, shirking behind. This was the first time he was meeting all of Tadashi's friends. Tadashi had told Hiro about his friends, shown his pictures and Hiro had seen one or two of them in passing. However, this was the first time any of them had shown up at the house.

"You're scaring him," Wasabi said.

"We're not scary!" Fred all but shouted. "Just look at him. He's so tiny!"

Gogo punched him in the arm. "Lower your voice," she ordered; having seen Hiro flinch at Fred's booming voice and high pitch squeal from Honey Lemon.

Tadashi chuckled, stepped away from Hiro. Hiro simply followed his brother's shadow, clinging to his brother's pant like it was a lifeline. "Sorry, he's a little shy." He bent down, pushing Hiro forward. "Say hello Hiro."

Hiro peered up at the large crowd before looking back at Tadashi. Tadashi nodded, gesturing Hiro to speak up. "Go on," Tadashi encouraged.

"Hello," Hiro said softly.

Honey Lemon let out another loud squeal, which caused Hiro to run back into Tadashi's arms. "They're not going to bite," Tadashi said with a chuckle. He had put off introducing his friends to his younger brother until now because he had known Hiro was painfully shy around strangers. Tadashi knew that Hiro wouldn't be running out to make friends anytime soon, but this was a good place to start. Perhaps his friends would be able to coax Hiro would his shell.

"Gogo might," Wasabi joked.

"Hey!" Gogo said.

"I got candy!" Fred said. He held out a red lollipop. "Kids like candy right?"

Hiro turned his face from Tadashi's chest at the mention of candy. He peered at the red lollipop, warily.

"See!" Fred examined. "Hiro, man, you know you want this red lollipop!" Fred waved it around, trying to catch Hiro's attention.

"Oh, oh! I have some cookies!" Honey Lemon exclaimed, pulling the Ziploc bag from her purse.

"Bribery. We've resorted to bribing the kid with food," Gogo remarked. She rolled her eyes, but clearly she was amused by her friends' actions.

"At least give the kid an apple," Wasabi said. "That's at least healthy!"

Tadashi smiled; amusement evident on his face. "See they're not so bad," he told Hiro. "Look they even want to feed you. What do you say? Let's go out and eat lunch with them?"

Hiro stared back at all the adults. Tadashi could see how Hiro weighted his opinions with careful thinking. Finally Hiro nodded, "Okay."

xXxXx

"Unbelievable."

Tadashi dropped his backpack in shock. Fred had been watching Hiro while Tadashi took his three hour exam that his crazy professor insisted on giving. Tadashi was mentally exhausted and all he wanted to do was crawl into bed.

Instead, he found the living room a mess, Fred was crashed out on the couch and Hiro was cuddled in his arms, fast asleep. The TV was showing the ending of one of Fred's many superhero movies, something Hiro had found an interest in, making Fred Hiro's favorite for the time being. There was food everywhere, pillows and stuffing all around and it looked like Hiro found a pen somewhere because the normally white walls were now covered in numbers.

Tadashi paused, stopping to take a closer look at Hiro's numbers. Instead of a randomized chaotic mess like he had been expecting, Tadashi was surprised to see math equations and some very basic physics on it. It looked like Hiro had been trying to figure out how Iron Man flew.

"Unbelievable," Tadashi repeated to himself. Looked like Hiro got the Hamada brains too.

xXxXx

"Hiro! Come here!"

Tadashi took a tired step back as he waited for Hiro to put down his blocks. (Admittedly, it was a strikingly accurate replica of San Franokyo). After countless hours, sleepless nights, tears of frustrations and unsurprisingly Hiro's unknowing encouragement, Tadashi's final project was complete. He was a little surprised he had managed to finish it so 'quickly' all things considered. Success was a success though, and Tadashi was going to need all the help he could get as Hiro got older.

"Tadashi?" Hiro asked.

"There's someone I want you to meet," Tadashi said, picking Hiro up.

Hiro tilted his head, curious. He had known that Tadashi had been working on something big for several months now.

Tadashi suppressed a grin as he activated his project. Hiro was going to love this. His younger brother's fascination with superheroes had involved into an obsession with robots.

Amazement filled Hiro's eyes as a white marshmallow shaped robot inflated before him. "Wow," Hiro said.

As soon, the white robot stepped out of his charging station and waved at Hiro.

"Hello. I am Baymax."

I really enjoyed the Hamada brothers relationship in the movie. This was playing with just me playing around with the ages and what would have happened if Aunt Cass wasn't in the picture and Tadashi was much older. Feel free to leave suggestions on what else you would like to see in this universe. I wanted to expand story but didn't have any ideas. Otherwise this is complete. Thanks for reading, please leave a review. :3