"N-No!" Sans said, glaring at Flowey.
"Oh. So I guess I will tell Toriel about your little accident," Flowey said with a smirk.
"F-Fine! Teww her! We're the same age, she probabwy has them too!" Sans shouted.
"Then what if I told Mettaton that Toriel was helping you draw on the walls?" Flowey asked. Sans lunged at Flowey, grabbing him by the stem.
"I'ww pick you! I'ww pick you like a daisy!" he shouted, angry.
"Oh Mettaton!" Flowey called in a singsong voice. Sans got up and ran to Mettaton, panicked.
"Don't hurt her!" He shouted, pleading. "I towd her to do it! It not her fauwt!" Mettaton looked at Sans with a confused face. He was holding Frisk, who was crying.
"Hurt her? Sans, what are you talking about?" He asked, rocking Frisk.
"Towi! She was hewping me draw on the walls!" Sans said, whimpering.
"Is that so?" Mettaton asked. "Toriel, darling, could you come here please?" He called up the steps.
"Yes, Mettaton?" Toriel asked, walking downstairs.
"Tell the truth please. Did you help Sans draw on the walls?" Mettaton asked her, sternly. Toriel looked down and whimpered.
"Y-Yes…" She squeaked, sniffling.
"Okay. For telling the truth, you aren't in trouble," Mettaton said, trying to calm Frisk down. "Could you please help me with Frisk? She won't stop crying." Toriel thought for a moment.
"When was her last nap?" She asked.
"Not for a while," Mettaton said. "She's probably tired." Just then, a loud bang echoed from the laboratory in the basement. The door to the lab flew open, and a thick black smoke poured out from the stairway. Alphys's cries echoed from the basement. Mettaton handed Frisk to Toriel. "Get her to sleep, please," he said, before making his way down to the basement. "Alphys, darling?" He asked, not being able to see anything through the black smoke. The sound of coughing was the only response he got. He walked towards the coughing. "Alphys, are you alright?" He asked.
"M-Mettatwon?" Came a squeaky response. Mettaton felt something bump into his leg.
"Alphys?" He asked, kneeling down to whatever bumped into him. He could make out Alphys, trying to fan away the smoke. The smoke finally cleared and she looked at him, sniffling. The room was a mess. Broken glass was on the floor, and a purple liquid covered the walls. Alphys was in similar condition. Her lab coat was stained and burnt. Black dust stained her face. She coughed.
"M-Mettatwon… S-Somefing went wong. The weaction w-was unstabwe," she sniffled, blood trickling down from a small cut on her forehead.
"O-Oh dear," Mettaton said, picking Alphys up gently. Her lab coat was way too big for her now. It draped over her like a cloak, covering her feet. The sleeves drooped over her tiny hands, making her look somewhat adorable. Upon picking her up, Mettaton noticed her coat was slightly wet in the back. "Alphys, darling, did you have an accident?" He asked, gently. Not wanting to upset her even more. Alphys whimpered and nodded. Mettaton had noticed that the others had gotten younger. They were shorter and starting to speak with a lisp. Alphys was no exception. She looked to be about three years old. If not, two and a half. "Alphy, are you the oldest of everyone here?" Mettaton asked her. Alphys shook her head.
"N-No. Towiel is de owdest… Sans is a bit youngew than her, and I'm a b-bit youngew than Sans. Then Undyne is y-youngew than me, and Papywus is de youngest," she explained.
"Oh, okay darling," Mettaton said. Alphys suddenly got an urgent look on her face. She whimpered and crossed her legs.
"M-Mettatwon…" She whimpered.
"W-What's wrong darling?" Mettaton asked. Alphys whimpered and closed her eyes. Mettaton looked at her confused, then he felt a warm liquid dripping down his chest plate. "A-Alphys!" He exclaimed in shock, quickly holding her at arm's length. Alphys looked at him, whimpering.
"I-I s-sowwy," she squeaked, tears welling up in her eyes. Mettaton noticed her tears and panicked.
"A-Alphy, darling, there's no n-need to cry, its o-okay," he said, trying to calm her down. Alphys was at her breaking point. She kicked her legs and cried, wailing loudly. "S-Shhh A-Alphy, calm d-down honey, l-let's get you c-cleaned up," Mettaton said, quickly carrying Alphys upstairs to her room. He set her down and started to change her out of her wet clothes. Alphys had stopped crying and was now sniffling. Mettaton noticed that she was avoiding eye contact with him. Mettaton then got an idea and began to change Alphys into a diaper. Alphys noticed this and looked at him, tearing up again. Mettaton quickly finished changing her and got her a new lab coat. He picked her up and hugged her, rubbing her back.
"W-Why do I h-have to w-wear a d-diapee?" Alphys asked, sniffling.
"I j-just thought it would be easier to work on an antidote without having to worry about accidents," Mettaton said, softly. Alphys sniffled and nodded. Just then, Undyne started crying. Mettaton set Alphys down on her bed. "Stay here, I'll be right back," he said, before going to Undyne. Undyne sat on the floor in the living room, crying. "Undyne, darling, what's the matter?" Mettaton asked, picking her up.
"I no walk anymowe!" Undyne cried, hugging him.
"D-Don't worry, darling. Alphys is working on trying to find a cure for this," Mettaton said, trying to comfort her. She sniffled, calming down. Mettaton set her on the couch and went back to Alphys. "Okay Alphy. How about another attempt at finding the cure to this?" He asked, picking her up. Alphys nodded and stuck her thumb in her mouth for comfort.
"I didn't know you were a thumb sucker," Mettaton said, noticing this. Alphys just gave a nod, keeping her thumb in her mouth. Mettaton took her back down to the lab. Once he set her down, Alphys wobbled. She tried to regain her balance, but her legs gave out and she fell onto her bottom. Mettaton helped her back up. Alphys tried to walk to the table, but after taking just two steps, she lost her balance and fell. Mettaton picked her up. "Need help, darling?" He asked. Alphys nodded, sucking her thumb. Just then, Mettaton felt something tap his leg. He looked down to see Toriel. "Oh, hello Toriel," he said. "What do you need, darling?" Toriel held up a piece of paper that said "I can't speak." She whimpered and looked at Mettaton. "O-Oh, w-well, what about Sans?" Mettaton asked. Toriel just shook her head. She went back upstairs. Mettaton sighed. "Okay, Alphy. Ready for the next attempt?" He asked, looking at Alphys. To his surprise, Alphys had her head rested against his shoulder. She was fast asleep, sucking her thumb. "I guess you needed a nap," Mettaton said, sitting down in a chair with Alphys.