The next week went smoothly. Hiro didn't have any attacks, only small scares, and Tadashi was able to advance more on Baymax. He was so close - he could feel it…

Tadashi turned Baymax on and was pleased as nothing went wrong, no annoying sound, no black out. This was good, but Tadashi wasn't holding his breath. Something had to go wrong…it always did.

And it did.

It was after two in the morning when it happened. Hiro knew something was wrong, he could feel it, and fought to resurface from his dreams to fix the problem. However, when his eyes shot open he realized he couldn't breath. Pain was coursing through every inch of his body and even with the mask, he couldn't seem to pull enough air in. One of his lungs felt full, like a weight was pulling on it and air couldn't get through.

He leaned forward, coughing and gasping for air. "T-'ad'shi…!" he cried weakly, panting and clutching at his chest. "Ta-Ta-d'shi! Cass!" Tears were running down his face, mixing with the sudden sweat as he ran a hand through his hair, leaning forward as far as he could and letting his hand drop to clutch at the blanket. He didn't know what to do; he was terrified.

It hurt. It hurt.

Tadashi smiled as he drove home. Baymax had actually responded - his sensors still weren't responding and he wasn't following protocol, but it was already a wonder!

Maybe this was a sign that things were getting better, that they would be okay. That not everything had to be bad.

He made it home late that night. Yes, he was worried to leave Hiro alone, but Hiro hadn't had an episode in a while, so he assumed that it would be fine. He locked up his Moped and went inside, locking the door behind him.

He was halfway up the stairs before he finally heard Hiro's cries and immediately dropped his stuff, running up the rest of the stairs to see his brother struggling. "Hiro!" Tadashi exclaimed, rushing to him.

"What's going on up here?" Cass asked tiredly before looking to Hiro and immediately waking up. She hurried to his other side. "Are you okay?" Cass asked as she ran her fingers through his hair, already knowing the answer, but wanting to keep Hiro responsive.

Hiro leaned into his aunt, gasping for breath and whimpering in pain, his hand tight in his shirt. "Hurts…hurts…." he sobbed, gasping.

"I'll get help, just hold on." Tadashi knew it was too late to call the doctor so that left one option.

"911, what's your emergency?"

What was the point of asking, couldn't they just send someone!
Tadashi quickly explained everything and they assured him an ambulance was coming.

When the ambulance came, Hiro had a vice grip on Tadashi's hand, his vision blurry and his face dripping with tears and sweat. They rushed him to the hospital as soon as they broke Hiro's grip on Tadashi, and Cass drove Tadashi and herself in the truck after them.

He was rushed to the emergency room and it wasn't for several hours later that a doctor came to tell them what was wrong.

"Fluid was starting to fill up his lung, preventing oxygenation. We put a tube in through the back of his chest to drain it out, and set him up with a nasal cannula for better air flow. He'll be out for the rest of the night, but you two are welcome to go stay with him if you want." The doctor said softly.

Cass sighed in relief. However, Tadashi clenched his fist. That wasn't good enough - it was just a temporary fix.

"Thank you doctor, we'll stay." Cass said lightly.

"Not me." Tadashi said immediately.

Cass looked at him in shock. "What- why? You know Hiro's going to want to see you when he wakes up."

"I need to work." Tadashi said looking to Cass. "I'm so close to getting it right - I just know it."

Cass looked at him sadly before sighing and hugging him. "I'll text you if he wakes up before you get back…"

"Thank you…"

Tadashi ended back at the labs with full intent of finishing his project. He turned on the lights and went straight to his computer, turning it on and typing furiously on it. Programming as fast as he possibly could. A temporary fix wasn't going to cut it-he wanted Hiro completely cured. And it would happen or he would die trying!

He worked for hours on end, even chugging coffee to make himself work faster. Tadashi felt past exhaustion when the sun came up. He paid it no mind and pushed Baymax's chip back in, watching it slide in before yawning and stretching. Unfortunately, he ended up stubbing his toe on the table's leg as he did so. "Ow!" He exclaimed cradling his foot. Well, at least that woke him up a bit.

"Hello I am Baymax; you're personal health care companion."

Tadashi looked up to the inflated robot in wonder. It worked… He worked!