A/N Everything Undertale belongs to Toby Fox; Ginny, as well as anything unfamiliar, is of my creation.
After the monsters had surfaced, and went through the mess of interviews and citizenship, Undyne decided to start working at the local gym. She would help put away weights that had been left out on the floor, and would assist people with their workout. Though her motivation methods were extreme, with her shouting at the top of her lungs, calling them all sorts of names, and using many empty threats—it was a common joke that she should have been a drill sergeant instead, which she took in great stride, and said she was done with any war-related fighting—she was well-liked by most of her co-workers.
Papyrus had managed to convince the others that he could still drive, despite having an injured neck, by promising he would be very careful. It also helped that the others kept sharp eyes out for any other oncoming accidents.
Soon enough, they reached the gym.
There were two firetrucks on the scene. They were all parked behind the gym, where only the backside of the building was still smoking. Along with human firefighters, there were also monster firefighters. They either held onto the hoses so the humans holding the hoses so they wouldn't get knocked back, or used water as an element to put out the fire.
Averyone saw Undyne sitting at one firetruck, with an oxygen mask being held to her face. Alphys stood by, looking very twitchy and nervous.
Everyone exited Papyrus's car and approached the truck. When it looked like the firefighter was about to dismiss them, Undyne held up a hand. "They're my friends," she said after removing the mask. Her voice sounded scratchy, very nearly hoarse. She was covered in soot, though didn't look to be burned.
"What happened?" Toriel asked, brushing some of the black powder from her shoulders.
"Ugh, it was a mess! I was making tea in the break room, but apparently coffee machines can't handle tea," she rolled her eyes.
"O-or at least th-the way y-you make it," Alphys added.
"Heh, true, I like it hot-hot-hot!" She paused to cough, and then took a few breaths from the oxygen mask. "Anyway, the damn thing started sparking and smoking. Eventually, it burst into actual flames! The fire and smoke spread, really fast. Everyone had to evacuate. But somebody locked all the doors to the break room, trapping me inside!"
"ARE YOU CERTAIN?" Papyrus asked. He had explained to another firefighter that the reason he was standing so stiffly was because he and his friends had nearly been in a car accident, and he hurt his neck. They were now examining his vertebrae, though they freely admitted that he should see a proper doctor as well. "I MEAN, PERHAPS IT WAS AN ACCIDENT—"
"—I know what happened!" Undyne shouted, coughing again. "I'm sure of it! I heard the click! I had to kick down the damn door!" She then hugged herself with a shudder. "I-I was really starting to panic in there. I thought... I felt like I was melting!" She looked down at her spread palms, as if checking to see if she actually was melting.
"You're not," Alphys whispered, laying a hand on her arm. "Y-you were probably hallucinating, or at best, were becoming extremely overheated. Heat stroke, maybe. I-in any case, you're alive. A-and you're safe."
Undyne's frown slowly turned into a smile. "Heh, you always know what to say, don't you?"
"W-w-well, not always," she stammered, fidgeting her glasses. "I-I just try to s-say what might be th-the best." She squeaked when Undyne kissed her on the forehead. She laughed as Alphys's face turned bright red-orange.
"By the way, how's the punk's sister?"
"Did... did Sans or Papyrus tell you what happened?" Frisk asked softly.
"No... why, did something happen?"
Toriel and Sans both quickly explained what had transpired the previous day, including what Ginny hadn't listened to before going into her rant. By the time they were finished, Undyne was clenching her fists and gritting her teeth. "That little bitch!" she snarled. "When I get my hands on her, I'll—"
"—Undyne, calm yourself," Toriel said, laying her paws on her shoulders. "Now is not the time to be thinking about revenge. She still hasn't woken, and I fear that she may be injured beyond what I can heal. In any case, I don't hold anything against her for the time being."
"She's right, Undyne," Alphys added. "I-It's obvious that she was r-really hurt, even if Toriel didn't mean it, or make sense. She and Frisk are the only f-family each other has. And she just found them again. Sh-she doesn't want to lose them in any ca-capacity."
"hell, even i admit i can understand," Sans confessed. "i mean, if i found papyrus after a long time, and the people that were taking care of him wanted to take him in, i'd feel pretty upset too."
"I guess," she humphed. "It still doesn't make her not selfish."
"no," Sans agreed with a frown. "and when she wakes up, if she doesn't fully explain herself, i'm definitely gonna have a few words with her."
"What do you mean, 'fully explain herself'?" Toriel asked.
"she's hiding something. i just know it. every time i look at her, i feel like she's got secrets, whether good or bad. this getting upset about you adopting frisk, it's something deeper. it's gotta be."
Toriel was silent for a few seconds before saying, "Well, Asgore tells me you're the best judge of character. So, I'll trust you."
"i guess you could say that," he shrugged with a lazy smirk.
After a few minutes, an ambulance pulled up. "Was anyone else hurt?" Undyne immediately asked as soon as the paramedics came around the corner.
"Not as far as we know," one answered. "But we're still going to be taking you to the hospital to be further evaluated—"
"—hell no! I'm fine!"
"We've got several monster doctors, so the hospital will be better-equipped to check you over," the paramedic continued as if they hadn't been interrupted. They and their partner opened the back of the ambulance as they spoke and argued.
"I don't care if they got the best healer! I'm fine!"
"Undyne?" Alphys spoke up. "Please, don't argue."
"But—"
"—Undyne, th-the firefighters can't tell if there's any underlying d-damage caused by the smoke or fire. Not even the monster firefighters. P-please, just do this for your friends' sake? For my sake?"
Undyne was silent for several minutes before heavily sighing, "All right, I can't resist my favorite girl." She stood up as Alphys flushed again. "If they can get my voice back to normal, it'll be even more worth it."
"I can't promise miracles, but at the same time, I don't fully know the advantages of monster medicine," the paramedic replied as they helped Undyne into the back of the vehicle. "Sir, you should probably come too," they said to Papyrus. "We were told you had a neck injury, yes?"
"INDEED, I DID. BUT WHO WILL BRING MY BROTHER AND FRIENDS? NONE OF THEM CAN DRIVE MY CAR."
"I-I'll drive," Alphys volunteered, holding up a small plastic card. "I also g-got my license. I'll take g-good care of your car."
"I BELIEVE YOU WILL, ALPHYS!" Papyrus grinned as he handed her the keys. He climbed into the ambulance and sat beside Undyne. The doors were shut, and the paramedics walked back to the front of the vehicle.
"You're welcome to drive behind us to the hospital," the other one said. "It'll be like a police escort. Just stay behind us."
"W-will do," Alphys nodded before turning to follow Toriel, Sans, and Frisk back to Papyrus's car.