"Well you're the one who got us in this mess in the first place!" Undyne shouted.
"I know, I know, but you don't have to freak out about it!" Sans yelled back.
"G-Guys, can we please stop f-fighting?" Toriel asked, getting upset from the yelling.
"It's not my fault that that idiot of a monster pulled that stupid prank on Alphys!" Undyne shouted, stomping her foot.
"Oh yeah?" Sans replied. "It's not my fault that you're a lame excuse for a royal guard!"
"Well, you're one to talk considering you do next to NOTHING for society!" Undyne shouted.
"AT LEAST I'M NOT A WHINY SUCK UP!" Sans shouted.
"AT LEAST I DON'T SUCK DOWN EVERY LAST DROP OF KETCHUP AT GRILLBY'S!" Undyne screamed.
"P-Please s-s-stop f-fighting!" Toriel said, tears in her eyes.
"AT LEAST I DON'T BELIVE IN THOSE STUPID ANIME THINGS!" Sans shouted, stomping his foot like a child.
"HEY! ANIME IS REAL!" Undyne yelled back, grabbing her spear.
"IS NOT!" Sans yelled back, grabbing a Gaster Blaster.
"IS TOO!" Undyne screamed.
"IS NOT!" Sans yelled back.
"Would you please stop FIGHTING!?" Toriel shouted, then she ran off crying.
"Huh?" Sans said, realizing. "Tori, wait up!" He shouted, running after her.
"What should we do?" Papyrus asked, playing with a Rubix Cube.
"W-Well, considering w-we can't really h-handle Frisk as f-five year olds, I'll c-call Mettaton," Alphys said, shakily grabbing a walky-talky like device.
"METTATON?!" Flowey shouted. "NO ONE WANTS HIM AROUN-!" He was cut off as more bubbles escaped his mouth.
"Shut it petals!" Undyne shouted, pouting. Soon, Sans and Toriel returned, Toriel still sniffling.
"I'm calling M-Mettaton," Alphys said.
"Good idea. Maybe he can help us out of this," Toriel said. Alphys pressed a small button on the device and she spoke.
"Mettaton?" Alphys asked into the device. "It's Alphys….Things have been kinda tricky around here latel-…..My voice?...Um, yeah, it's a bit higher than usual…Why?...Well, can you come over? I can't really explain this…..Yeah, please get here as soon as possible….Okay, thanks, bye." With that, she pressed the button on the device and put it in her pocket.
"So, is he coming to help?" Toriel asked.
"Yeah, he'll be here in a bit," Alphys said. Soon, there was a knock on the door. Toriel reached up to open the door, but she couldn't reach it. Undyne sighed and opened it for her. When Mettaton saw Undyne, his jaw dropped.
"Undyne? Is that you darling?" He asked in shock.
"Heck yeah it's me, and don't call me darling!" Undyne said, pouting.
"What happened to you?" Mettaton asked.
"Alphys will explain," Undyne said.
"I-Is that M-Mettaton?" Alphys asked, walking over.
"Alphys! What happened to you guys?" Mettaton asked, kneeling down to her.
"It's a long story," Alphys said.
Alphys explained what happened while Toriel and Sans played a game of peekaboo with Frisk.
"So, is there any way to reverse it?" Mettaton asked.
"So far, no. T-That's why I asked you to come over. We kinda need a little h-help,"
"Well, I'm not exactly sure what I should do," Mettaton said. "I've never had to deal with children." Just then, Alphys went wide eyed as she remembered something.
"U-Um… M-M-Mettaton," she stammered.
"Yes darling?" Mettaton said, kneeling down to her.
"The a-antidote that F-Frisk sprayed us w-with was supposed to p-p-progress her age s-slowly. S-Since we got the reverse effects, I-I think we might start t-to get y-younger over the next few d-days," Alphys said, tearing up. Mettaton's eyes went wide.
"Younger?!" Mettaton asked, shocked. Alphys did some math in her head.
"I t-think we'll get t-to the age of a-about three or f-four," she said, tears streaming down her cheeks. "A-And it's a-all m-my f-fault!" She sobbed, burying her face into her hands. Mettaton was taken back by this. He knew Alphys was a little fragile, but he didn't expect her to burst into tears. Mettaton picked up the crying dinosaur and hugged her.
"This isn't your fault, honey," he said, softly.
"B-But I w-wanted to h-help, a-and I m-messed up! N-Now e-everybody is s-suffering f-f-from my m-miss hap!" Alphys sobbed, embarrassed that another attempt to help ended in failure.
"This wasn't anyone's fault Alphys," Mettaton said. "You didn't do anything wrong."
Alphys just kept crying. She tried to stop, but for some reason, her body wouldn't pull itself together. She knew that this was the regression effect taking place on her mind and body. The fact that she was getting even younger made her feel worse. Mettaton knew that her mind had been greatly affected by the potion. He just stood, hugging Alphys, trying to pacify her.
"What's wrong with Alphys?" Undyne asked. She stood at Mettaton's feet, looking up at him with a tilted head.
"She's just a little upset, honey," Mettaton answered.
"Why?" Undyne asked, in a childish tone.
"Just give her some space, please," Mettaton said.
"W-Wait," Alphys sniffled, wiping her nose on her sleeve. "I t-think the o-others should k-know."
"Know what?" Undyne asked, curiously.
"The antidote t-that Frisk s-sprayed us with was s-supposed to p-progress her age s-slowly. S-So, we're g-going to get y-younger over the n-next few days," Alphys said, with a look of defeat.
"Wait, who's the youngest?" Undyne asked.
"I think either you or Papyrus," Alphys said. "Why?"
"Whoever is de youngest will regress de youngest," Undyne said.
"I think that might be true," Alphys said, thinking.
"So, Papywus and I will be de youngest?" Undyne asked, dreading the answer.
"Y-Yeah," Alphys said, noticing Undyne was getting a lisp. Just then, Toriel ran into the room.
"Um… Mr. Mettaton," she said shyly, "I think Papyrus had an accident."
(Just so you guys know, Mettaton is in his EX form).