My big exam is finally done! I couldn't take studying any longer. It feels so good to be able to write again!

Also, thanks everyone for the suggestions. Unfortunately, I don't ship Tadashi/GoGo or Tadashi/Honey. I have nothing against those pairings and I don't hate them; I'm just not a shipper. So romance won't be something I'll include in this like some people were suggesting. Tadashi and Hiro's relation as brothers is what I like about the movie. I hope you keep enjoying this story regardless; and sorry if I disappointed you.

Also, the first part of this story was originally a one-shot I had planned for the fandom. I canceled it because it didn't feel right to have something so vague for a one-shot; but thanks Heaven I didn't delete it! It came in handy.

Well, this note is quite big already, so enjoy!

Tadashi walked beside his aunt Cass, looking ahead. He made his best not to run, but the excitement going through his body made that a nearly impossible mission to accomplish. Cass had to pull her nephew back more often than not, for he kept trying to push her to make her go faster.

"Aunt Cass, come on!" Tadashi had been on that hospital before, but it had never felt that big. He even turned his head and looked behind him to make sure they weren't walking backwards. No, they weren't.

Cass laughed at the little boy and held his hand tighter to keep him from escaping. "Calm down, Tadashi. Your parents aren't going anywhere, and neither is their baby. We don't have to hurry."

"But I want to see my new brother or sister! I've been waiting for almost a year now; I don't want to wait anymore!" He wailed and stamped his foot, annoyed, but still happy and excited.

"Tadashi, you only had to wait nine months. Not even that, actually, since that baby came a month earlier than expected. Thanks Heaven he's alright. Or maybe it's 'she's alright'. Your parents really wanted to keep it a surprise, hum? What do you want it to be, Tadashi? A boy or a girl?"

"I don't really care. Whether it's a little sister or a little brother, I'm finally going to have someone to play with me. I'm so happy!"

Cass chuckled again and kept walking. Tadashi tried to calm down, but his heart started to beat faster and his smile grew bigger with every step he gave toward the doors by the end of the hallway. He knew he'd soon be seeing his new sibling, who had just been born! He could barely believe it. Then he felt his heart beating fast again, but there was a new feeling along the previous happiness. It took him a moment, but Tadashi finally realized he was nervous.

"Hey, Aunt Cass... Do you think the baby will like me?"

She turned her head to look down at her nephew. His face previously filled with joy was now full of concern and jitters; but he still made his best to keep smiling. He was happy, after all.

"Of course the baby will, Tadashi. The younger siblings always look up to the older ones. I know from experience. Your mother wasn't much older than you when I was born, you know." She said, looking up and giggling at some memories.

She finally released his hand as they walked through a door. He walked by her side for a few seconds, but then Tadashi ran and pressed his face against the glass as he searched the cradles of newborns.

Cass laughed again, talking to the nurse and going to Tadashi's side.

"Which one is it? Which one is the new Hamada?" He asked, frantically looking from side to side.

"The baby is still with the mother." The nurse said, pointing to a door on the opposite corner of the room. "This way."

Cass took Tadashi's hand again as they followed the nurse. He grew more and more nervous as they walked through the maternity ward; looking around and trying to take deep breaths. His baby brother or sister had finally arrived! The moment he had been waiting for the last months was there. But he never thought it would make him so nervous.

'What if the baby doesn't like me? What if I don't get to be a good brother? What if the baby...'

He stopped thinking when the nurse opened the door. His heart started to beat fast again as he laid his eyes on his mother. She was in bed, wearing a blue hospital gown. Her hair was still a little messy, her husband standing over her as he passed his hand through her hair. Tadashi gulped and felt his legs freeze. He would have stayed like that forever if Aunt Cass hadn't tapped his back, as in telling him it was alright.

As he approached his parents, he noticed they were staring down at a small bundle in his mother's arms. He gulped again, but relaxed a little when his mother looked at him and smiled.

"Tadashi!" She said, happily. "Come see your new baby brother."

"B-Brother?" He tilted his head as he slowly walked toward the bed, giving a soft smile. He could feel his hands shaking. "So it's a boy?"

His parents nodded with smiles on their faces. When he finally got close to the bed, Tadashi tip-toed. His mother held out the bundle as he placed his hands on the bed to get a closer look.

Wrapped in a blanked was a little, round, white head. The baby had black, messy hair; that seemed to point at all the directions possible. His little eyes were closed as he slept peacefully.

"My brother." Tadashi whispered in awe, almost in shock.

His father chuckled and went to Tadashi, lifting his elder son onto the bed. The boy kept staring blankly at the baby, begging the gods it wasn't all just a dream.

'A brother. I have a brother now.' He thought to himself. 'And he's so cute!'

"Do you want to hold him?" His mother asked, trying to organize the baby's hair.

Tadashi nodded and reached out his hands, but then hesitated and bit his lip.

"What if I drop him? What if I wake him up? What if he cries?"

His mother chuckled. "You'll be fine. But be very careful, he's sleeping."

She gently handed the bundle to Tadashi and the boy held the baby close to his chest. He was surprised at how light that baby was; almost like holding a little tuft of cloud.

"He's so... Cute. And so tiny." He said, his smile growing. "What's his name?" Tadashi asked, looking up at his parents and aunt.

"Hiro. Hiro Hamada." His father answered.

"Hiro... I like the sound of it." He said as he looked back to the infant. "I'm your big brother, Tadashi." He said, softly rocking the baby in his arms and smiling.

Tadashi's smile quickly turned into a frown when the baby's eyes fluttered open. Two brown eyes stared up at him in wonder. Hiro tilted his head, causing his older brother to get apprehensive and hold his breath.

'Oh, no.' He thought. 'He's going to cry. That's it, he doesn't like m...'

Then Hiro smiled.

Tadashi felt like something inside his chest was melting. His heart slowed down when he looked at his brother's happy face, relieved that Hiro was not going to cry.

"He likes me!" Tadashi exclaimed, still stuttering a little from his previous nervousness. "Hiro likes me!"

The adults exchanged looks and laughed as Tadashi kept looking at his brother's smile, smiling as well. He had never felt anything like that before; he just wanted to keep smiling forever and never wanted to let his brother go.

"So I guess you like him too?" His mother asked.

"Are you kidding me?" Tadashi exclaimed once more. "I love him! He's the most perfect baby brother that has ever lived! I love you, Hiro." He said as he gave his brother a gentle squeeze.

The adults smiled again. As they started to talk, Tadashi couldn't take his eyes off his little brother. He was so tiny, so cute and so delicate. That was not how he imagined holding his sibling would be like. It was way better. It was something he'd never be able to describe, not even when he got older.

"I'll always be with you, Hiro. I'll be the best older brother you could ever have. I love you already, and I always will." He whispered, softly caressing his brother's hair.

The flashback went through Tadashi's mind like if he was watching a movie. He was just a kid when Hiro was born, which was the reason why he could never really remember that day. But after Hiro had been turned into a five year old again, very clear and specific memories that he didn't even know he had were starting to come back.

The rain still fell from the sky when he finally got to the Lucky Cat Cafe. It was starting to get heavier by the second, and by the time he unlocked the front door a few lightings had started to fill the surroundings. The house was dark, even if it was hardly even 4pm yet. Tadashi glanced at Hiro's head, which fell loosely on his shoulder as the young boy slept.

Tadashi slowly went upstairs to their room, being careful to avoid the squeaky stairs and floorboards. He heard the sound of the raindrops get louder outside, pounding harsh against the windows, meaning that a storm was coming. Suddenly, a flash filled the room and the sleeping boy gasped awake after a thunder, tightening the grip around Tadashi's neck as he shrank in fear.

"Dashi..." He muttered, still a little sleepy.

"Hey, it's alright, buddy." The older one said, even if the sudden thunder had startled him as well. "The rain can't get to you when you're inside." He took off his jacket from his brother, tossing it aside. It hit the floor with a wet thud as Hiro rubbed his sleepy eyes. He walked up to his bed and looked to the window; the drops ran down the glass and cooled the lightning lit room.

Tadashi saw Hiro sit down on his bed and grab his stuffed robot. Then the older Hamada went to the bathroom and grabbed a towel, rubbing it on his hair several times to get rid of the water. His shirt was all wet, except for the shoulders; thanks to Hiro's warm embrace all the way home. Tadashi chuckled when he looked to the mirror and saw his reflection; that towel had made his hair messy and now he was looking like an older, short haired version of Hiro. He passed his hand through his slightly wet hair to make it go back to normal before going back to his room.

"Hey, buddy, did you know... Oh, no."

The little boy was sitting on the corner of his bed, one hand over his stomach and the other one covering his mouth. His stuffed robot was now on the floor and he was bending forward. Tadashi knew what that meant. He jogged to Hiro's side, his hands fluttering around his brother's personal space.

"Hiro? Stay calm, ok?" He bit his finger as he tried to think. "I'll take you to the bathroom, ok? Try... Try not to... Try to hold it back until we get there." He said, slowly putting one arm on Hiro's shoulder and snaking his other arm under Hiro's legs. He stood up and carried Hiro to the bathroom, trying not to show how apprehensive he was. Hiro took his hand of his mouth and tried to catch his breath, quickly putting it back when his cheeks puffed again.

"It's ok, buddy. It's ok." Tadashi slowly put Hiro on the floor and knelt down by his side, rubbing his brother's back to make him calm down. Hiro's tiny hands grabbed the toilet seat as he took fast and deep breaths. He looked aside to make sure Tadashi was there. His older brother smiled and softly tapped Hiro's back, taking deep breaths himself.

"It's ok." He repeated.

Hiro finally bent his head over the toilet seat.

Tadashi sat down on the floor, rubbing his forehead as he watched Hiro. His heart hurt to see his little brother going through something as painful as that, but Baymax had said vomiting could be one of the collateral effects. Then he started to remember something, allowing his mind to travel back to the past for a while.

It was Tadashi's sixth birthday. Hiro was spending the day with their Aunt Cass so Tadashi could enjoy his special day with no interruptions. After his parents had taken him to the movie theater, they went back home and prepared him a chocolate cake with ice cream and several other treats. However, the young boy went overboard with the sweets, which put him in a similar situation to the one he was going through on that moment with Hiro; except he was now playing the role his mother had played.

He could remember the scene like it had been the day before. He could almost see his mother rubbing his back and whispering that everything was going to be alright. Once he was fine, she chuckled and said that she was going to give him a smaller cake the next year. Then she put him in bed and sang him the same lullaby he had sang Hiro the night before. Well, he had tried to sing it, but he couldn't remember the lyrics. How was it? It went something along the lines of...

Tadashi snapped back to reality when his brother coughed. Hiro wiped his mouth with the sleeve of his shirt, closing his eyes as he coughed once more.

"Are you done there?" Tadashi said, sounding as sweet as he could sound.

Still with his head bent over the toilet seat, Hiro nodded. His cheeks were red and his eyes were watery; and Tadashi assumed Hiro's stomach hurt, for the young boy moved his hand over to his belly. Tadashi tapped Hiro's back once more before standing up and going to the sink, soaking a small part of the towel he had used to dry his hair. Hiro looked up at his brother to see what he was doing.

"Dashi?"

"Here." Tadashi said, approaching Hiro and kneeling down again. He pressed the damp towel to his brother's red face, trying to make him feel better. "Don't breathe like that. Breathe slowly and take deep breaths. It'll help you to feel better."

Hiro nodded as Tadashi kept wiping his face with the towel. A few drops of sweat went down Hiro's forehead from the physical exertion. He stuck his tongue out and shook his head, clearly disgusted with that situation. Tadashi chuckled a little and after Hiro's face went back to its normal color, Tadashi took his brother to the sink and turned the faucet on.

"Here, wash your mouth. You'll be alright."

Coughing once more, Hiro reached out for the water and did as his brother told him. After he rinsed out his mouth, Hiro stood still for a few minutes; Tadashi always by his side tapping his back. Another thunder outside caused Hiro to get startled, nearly falling over, but Tadashi caught him just in time.

"Calm down, it's just a thunder." He said, taking his brother back to his bed. Tadashi attempted to lay Hiro down, but the young boy pulled him away reluctantly.

"I don't like rain." Hiro said in his tiny voice. Tadashi tilted his head and watched as Hiro squatted on his bed, putting his arms around his knees and bowing his head. "It's sc-cary."

The older one sighed and looked to the window. More thunders and more lightning, the drops still falling down like bullets against the window. He softly smiled, poking Hiro's head. The younger one slowly started to lift his head; his fear filled eyes looked up at Tadashi, who made his best to give the most comforting smile he could. Then he sat down on the bed. He didn't know exactly what he was going to do, but he knew he couldn't leave Hiro alone.

"It's okay to be afraid. But the rain can't get you here. Neither do the thunders, or the lightning. You're safe."

Hiro slowly stretched his legs, feeling a little more relaxed. He scooted over the bed until he was by Tadashi's side and slowly scrambled into Tadashi's lap, wrapping his arms around him. Tadashi didn't think twice before returning the hug. Another thunder and he could feel Hiro's heart jumping inside his little chest. Tadashi looked down at the scared boy; noticing his eyes were scrunched closed, as tight as the hug he was giving his older brother.

"Make it stop..." Hiro said, sniffing.

Tadashi closed his eyes as well, starting to softly rock their bodies together to calm his brother down. "I can't make it stop, Hiro. I'm sorry. But don't worry, every storm runs out of rain, even the big ones like this. And more, the rain can't hurt you. Not when you're inside the house. And again, I'm here. I won't let anything bad happen to you."

Hiro sobbed once more and got out of Tadashi's lap, sitting by his side. The little boy lied down on the bed, using Tadashi's legs as a pillow. He sighed, feeling a little more relaxed.

"I need you, Dashi. Thank you."

Tadashi smiled and softly caressed his brother's hair. Hiro yawned, sighing once more. "No problem, buddy. No problem at all. And believe me when I say I need you too. More than you could ever imagine."

Another thunder rumbled outside. Hiro let out a painful wail as he covered his ears with his hands, shrinking in fear. Tadashi frowned in confusion. Why was Hiro so scared of a storm? It could be scary for a little kid, but Hiro's fear seemed to be something nearly irrational. Tadashi made a mental note to casually ask Aunt Cass about that later.

Hiro yawned and closed his eyes. Tadashi softly tapped his brother's shoulder, causing Hiro to sit up by Tadashi's side and tilt his head. Tadashi stood up and grabbed Hiro on his lap, sitting down on the bed with his back pressed against the headboard of Hiro's bed and Hiro lying on top of him. The young boy smiled and leaned his head against his brother's shoulder, looking up at Tadashi. He felt something being draped over them, and saw Tadashi pulling the blanket up.

"Comfy." Hiro said.

"Yeah."

"Hey, Dashi?"

"Yes, Hiro?"

"C-Can you sing me a lullaby?"

Tadashi raised an eyebrow. "A lullaby?"

Hiro looked up at his brother and nodded. "I want to hear somet-thing ot-ther th-than thunders."

"Well, hum... I never had to sing a lullaby before, so... I don't know. I don't think I can do it..."

"Please?"

Hiro gasped when he heard another thunder, closing his eyes. Tadashi sighed. He could remember the lullaby his mother used to sing him, but it killed him that he couldn't remember the lyrics. He sighed and tightened the hug he was giving on Hiro, as he softly started to 'hum' it like he had done the night before. But the noise of the rain falling outside, alongside the thunders made it hard for Hiro to hear him.

"I... I can't hear it."

Tadashi let out some air and ruffled Hiro's hair. He looked to the window and starting singing the first words that came to his mind; following the rhythm of his mother's lullaby.

Little Hiro,
Be not afraid
The rain pounds harsh
Against the glass

Hiro looked up at Tadashi, and the older one felt something similar to when he was a kid and held his baby brother for the very first time and thought he was going to cry. Just like when he was a baby, Hiro smiled. Tadashi mentally sighed in relief as Hiro rubbed his head against Tadashi's chest. He closed his eyes, waiting for his brother to continue, but all he heard was silence. Hiro opened his eyes, annoyed, and tilted his head as in meaning 'What are you waiting for?'

"Fine, I can take a hint." Tadashi giggled, caressing Hiro's hair. He looked around one more time and hummed a few notes more before he tried to come up with something else. He could fell Hiro's heartbeat was slowing down as he relaxed onto his brother's embrace and closed his eyes again.

It's like an unwanted stranger
But there's no danger
And I won't leave you behind

Hiro heard Tadashi's voice and didn't seem to notice another thunder outside. If he did notice, he didn't mind it. Tadashi hummed for a while as he looked around once more and softly rocked Hiro back and forth to calm him down.

The storm clouds mask the sun
And darken your day
But they will go away
Once a new day has begun

In his lap, Tadashi could feel Hiro softly bobbing his head to the lullaby. He yawned once more and rubbed his eyes. Tadashi felt a cold draft and pulled the blanket up a little more until Hiro was fully covered. He tugged Tadashi's shirt and rubbed his head against his brother's chest again. He loved to hear Tadashi's voice, nearly as much as he loved to hear Tadashi's heartbeat.

"Dashi singing." He giggled, without even opening his eyes.

"Hey, I told you I wasn't good at this." Tadashi smiled, playfully ruffling his brother's hair.

"No... I like it."

A little surprised, Tadashi smiled again and thought a little to come up with another verse. He could almost see his mother there, singing him her lullaby when he was too scared to sleep.

Once, I also
Was a little child
And I was afraid

He stopped singing for a moment, he wasn't sure why. He shook his head when Hiro tugged on his shirt again to get his attention after Tadashi stopped singing out of nowhere.

But a gentle someone always came
To dry all my tears
Keep away the fears
And to give a kiss goodnight

Tadashi hadn't created that part. He had at last remembered the lyrics, and his own heart started to beat fast when he realized it.

Well, now I am grown
And these years have shown
Fears are a part of life as it goes
But it's cold and it's late
So I'll hold you and wait
'til your frightened eyes do close

Hiro was about to drift off when the loudest thunder he had ever heard rumbled outside. He gasped in fear, kicking the blanket away as his heart started to beat so fast that Tadashi could hear it even if he wasn't near his brother's chest. Tadashi held him tight to keep him from falling out of the bed, and it took Hiro a few minutes to calm down again.

"Hush, it's ok, Hiro."

The young boy pouted.

"I just want it to st-stop..."

Tadashi tapped Hiro's back again. The young boy clutched his stomach, and Tadashi could tell it still hurt from earlier.

"The rain will stop soon, and so will your pain."

"Ok..." Hiro muttered, fear in his voice. The older one looked at the ceiling, covering his brother's eyes with his hand when he saw a lightning. Then he reached for the blanket and draped it over Hiro and himself again to keep them warm.

I understand your fear
But remember, I'm here
The thunders may give you nightmares
But they're not real, understand
So just hold my hand
I won't leave you behind

Tadashi sighed when he heard Hiro's heart calming down.

So just close your eyes
No reason to cry
Everything will be fine when you wake up

Tadashi looked down, Hiro's eyes were open a crack to look at his brother singing.

The rain will be gone when you wake up
The thunders will be gone when you wake up

Hiro finally closed his eyes and took a deep breath, smiling and relaxing again.

But I'll still be here when you wake up...

Tadashi whispered that last line looking down at Hiro's face. The young boy wasn't moving or speaking anymore; he just lied down on Tadashi's lap as his chest softly went up and down. The older brother sighed and relaxed, pressing his head against the headboard. It had taken a while, but Hiro was finally sleeping. His mind went back to Hiro eating the peanuts, the crazy drive to the college, kicking the wall to activate Baymax, going home under the rain and helping Hiro when he felt sick. Now there they were.

It had been one tiring day. Tadashi could use some rest. He looked down at Hiro one more time to make sure he was sleeping and alright, before putting his head against the headboard again; closing his eyes and finally dozing off.

I tried so hard not to write Tadashi singing because it seemed a little silly, but I couldn't help myself. And no, those lyrics aren't mine. I just changed them a little to fit the story more, but they belong to Vienna Teng, from her song called "Lullaby for a stormy night" (Come on, it fits so well!). I was dying to write some more interaction between Hiro and Tadashi. This fic is about them, after all.

GoGo was going to appear at the ending to tell Tadashi something, but since this chapter was already too long I decided to stop it here. I don't like when my chapters have more than 5,000 words, so yeah. And Hiro is super scared of storms, the poor little boy. Don't worry, you'll understand why later on! (Yes, there's more to it than just being scared because of the noises).

That's it for now. I hope you liked this chapter! Thanks for reading and see you soon.