**A.N.: Thanks again to my friend for motivation and being someone to bounce ideas off of. Another thanks to my beta, for helping me clean this up and for being so prompt. :)**

Hiro turned his head from his desktop, fondly watching the figure of a sleeping Tadashi through the open divider. It hadn't taken long after reuniting with Baymax for the five-year-old's eyelids to start drooping, and, after shedding his coat and boots with a little assistance from Hiro, he curled up with his scarf in the middle of his old bed and was dead to the world in seconds.

Hiro chuckled softly at the memory of Tadashi's petulant face when he discovered he didn't quite have the dexterity to unbutton his jacket all the way, and how he had completely refused Hiro's offers of assistance until he realized his arms were stuck inside the cumbersome semi-removed item of clothing. It seemed Tadashi's determination to return to his usual existence was much too fast-paced for his miniature five-year-old body.

Hiro turned back to the task at hand: obtaining official possession of Tadashi. It had taken him well towards three hours to find the particular orphanage Tadashi had been living in, since he failed to ask him before he went to sleep, and he hadn't the heart to wake him up now. As it turned out, it was a larger one, named oh-so-originally San Fransokyo Orphanage.

Apparently, since Tadashi had not been put up for adoption officially, he was still considered a missing person, and an adult family member who could prove relations was free to claim him with minimal paperwork required. Hiro frowned at the apparent ease of gaining custody of a five year old child, relations or not. However, after a brief pause, he decided against mentally ranting against the poor child protection services. (Given Murphy's Law and wishful thinking and whatnot, he wasn't about to risk anything.)

With Aunt Cass still in the hospital, Hiro had surprisingly found himself in a situation where he was actually thankful for his truckload of responsibilities and social expectations as a nineteen year old. Being classified as an adult was difficult, certainly, but it was worth it to have been granted the ability to claim Tadashi without his Aunt's assistance. Tadashi was an agreeable kid, and if Hiro hadn't been old enough to take custody of him, another year might have been too late.

Avoiding thinking about the nightmare that might have ensued had Tadashi already been adopted, Hiro called the orphanage, who said they would send over a representative within the hour with the proper paperwork.

"Hey, Baymax, could you get a DNA sample from Tadashi without waking him? Also, run a thorough scan on him, just in case." Hiro slid his chair towards Baymax, who had looked up from the side of the bed he had taken silent vigil over.

"Yes, Hiro, the needles I have been equipped with cause minimal pain and should not wake him." Baymax moved to withdraw a sample of blood into a ballooned finger, turning it a pale red. Tadashi barely stirred. "Also, I already scanned him when you first brought him within my care. Aside from natural reactions to being out in the rain for an extended period of time, Tadashi is in perfect health."

Hiro handed Baymax a small vial to place the extracted blood into, and offered his own arm for the same process. "Yeah, well do it again. You might have missed something."

"I do not miss things, but I shall do as you command, Master Hiro." Hiro rolled his eyes at the 'title' that Baymax saw fit to address him with when he thought he was being unreasonable. Robots - Sarcastic self-aware machines, the lot of them. Baymax handed Hiro the two vials, one that he labeled with a large, precise 'T' and the other, more recently filled vial with an 'H'.

"Scan complete. I again reassert my previous observation that Tadashi is in perfect health, though perhaps I should remark on a few significant changes."

Hiro scoffed, "Of course he has a "few significant changes": he was an adult, and now he's five. I should hope he's different."

"That is not what I was referring to."

Hiro frowned, eyes rounding in worry as he turned towards Baymax.

"What do you mean? What's wrong?"

"There is nothing wrong, I already stated that he is in full health. However, though his DNA is largely the same, and the changes should not affect the test you plan to use them for, there are significant physical changes. For instance, though they maintain a healthy density required to prevent breakage, his bones are now hollow, in the same way that an avian's would be." Baymax pulled up an x-ray of Tadashi's arm to provide proof.

"...What? No, this has to be a mistake, scan him again."

"It is no mistake, the abnormality appeared in both scans and was not present before the fire, when I scanned Tadashi during my creation."

Hiro's eyes darted around the room as he contemplated this new reality, struggling to find something to center himself with, his eyes finally returning to the sleeping form on the bed.

"Well, I guess that isn't so bad. I mean, if it doesn't hurt him, then I guess there is nothing wrong with it. It does explain why he was so light for a five year old." Hiro glanced up at Baymax, dreading the answer to his next question. "Is that all?"

"No." Hiro's heart sank to his stomach even as he reminded himself that Baymax had said Tadashi was perfectly healthy. Baymax paused before continuing. "I have also sensed an anomaly that I believe resulted from his unconscious state. When you delivered him to the room, his body temperature matched yours at 98.6 degrees Fahrenheit. However, upon his unconsciousness it has fluctuated between that and 115 degrees, but with no negative effects to his well-being and with no sign of an infection that might prompt the body to respond in such a way."

Hiro reached out his hand and gently laid it on Tadashi's forehead, careful not to wake him, and frowned at the heat radiating off the sleeping figure.

"And you're absolutely positive he isn't sick?" Hiro didn't want to take any chances with the well-being of his sibling, certainly not so soon after getting him back.

"I am 97.4 percent positive that, unless some new illness has learned to superheat a person without harming them, Tadashi is not sick."

"Haha, very funny." Hiro didn't appreciate the approach that Baymax took to allay his fears, though admittedly he caused it in all likelihood. He couldn't imagine losing his brother again to something as trivial as a fever, especially with a fully functioning medical robot residing in his home.

His thoughts were interrupted by the sound of the doorbell downstairs, and he grabbed the two vials, placing them in his jacket pocket to avoid scaring someone who was potentially not the representative he was expecting to see at the door.

The representative seemed surprised that Hiro already had DNA samples, but when Hiro explained about Baymax, she relaxed and asked if she could see him and Tadashi before going on her way, if only to affirm that Tadashi was in safe hands. A quick peek upstairs and she was convinced, and she handed a small packet of papers to Hiro that would practically determine Tadashi's existence, since he had been found so young and without any identification.

Hiro saw her out, silently grateful that it had gone so painlessly, and that he now had a way of reentering Tadashi into his life. He briefly laughed at the idea of Tadashi having to interact with actual kindergartners, though he doubted that it would actually occur.

Though his body lacked the strength and dexterity of an adult, his mind held too much information to go through school again the systematic way. Besides, Tadashi would probably accept nothing less than being reinstated at SFIT with his friends. Hiro's mind crashed to a halt at this thought. The team. They didn't know. They were still living in a world where Tadashi had perished in the fire five years ago. He had to tell them!

Hiro's hand was halfway to his phone before he remembered the likelihood of the team barreling into the café to see their long-lost friend. It wasn't even nine at night; they would inevitably make it their number one priority. Well, Honey would take a significantly longer time to arrive than the others, but there would still be no way that Tadashi would be able to remain sleeping - or to get any sleep that night, in fact - if he told them right then.

Hiro debated just calling Honey Lemon, but remembered that in England it was barely past four thirty in the morning. He decided that the entire team would find out in the morning when Tadashi was ready. Looking over at the curled form across the room, making out the gentle rise and fall of Tadashi's chest, Hiro couldn't stop the smile that broke across his face as he reached over to turn out the light.

Tadashi was back. He had his brother back.

**A.N.: I am aware that this is not typically how it would work in the real world, but this is my world and I am taking artistic license over the actions of the orphanage. I don't want the legal battle over Tadashi to be the focus of the story, though it would make a decent plot, that is not where I am taking this. Reviews are welcome and appreciated**