"What is going on down there!?" A female voice called down the stairs. Sans panicked when he heard this. The voice belonged to Toriel, and she did not sound happy. Footsteps echoed down the stairs, Toriel followed. She gasped at the sight of the lab, it was destroyed! "W-W-What h-happened down here?!" She asked, still taking in the sight. Sans was busy trying to sneak past her.
"I-I have no idea what happened!" Alphys stuttered. "The arm just started flying!" Toriel studied the arm and noticed the small rocket. She knew exactly who was behind this.
"SAAAAANS!" She shouted, squeezing the rocket in her fist.
"Y-Yes, Tori?" The skeleton nervously replied. Tori turned to face him and glared at him.
"WHAT IS THE MEANING OF T-," Toriel was cut off by a loud sob that came from behind the shelf, followed by soft crying. Toriel's mother like instincts kicked in when the sob reached her ears, and she hurried to the shelf. Sitting in a small pile of glass, was a small toddler. The child had short-ish brown hair and a blue and purple striped sweater that was clearly too big. The child sniffed and wiped its nose on its sleeve. Without hesitation, Toriel picked up the child. When she met the child's eyes, she realized who it was. "F-Frisk my child?" She stuttered. The child looked at Toriel and giggled.
"Moo Moo!" The child said, pointing at Toriel. Toriel smiled.
"I'm not a cow sweetie," She said, with a chuckle. "It's me, Toriel, don't you remember me?"
Frisk looked into Toriel's eyes and smiled. "Mama!" She said, resting her head against Toriel's shoulder. Toriel knew for sure that this was Frisk, because Frisk had started calling her Mom since they started living in the same house.
"Yes my child, Mama's here," Toriel said, hugging the child.
"Mama go Moo Moo!" Frisk said, giggling.
Sans and Alphys were taken back by this, but Sans walked over the Toriel and looked at Frisk.
"Hey, kiddo is that you?" He asked Frisk, booping her nose.
"Saz!" Frisk said, reaching for him.
"Aww, I'm here kiddo," Sans said, ruffling her hair.
"Sans, are you down there?" A voice called from the stairs.
"Yeah, Pap, I've been down here since lunch," Sans called back up the stairs.
"Well can you come up here, I need help solving this puzzle," Papyrus called back.
"I don't trust the stairs, I think there up to something," (Rim shot) Sans called back, smiling at his clever pun.
Papyrus sighed and came down the steps. When he entered the lab, he was holding a Rubix Cube.
"Oh, hello Toriel, and who is this?" Papyrus asked, pointing to the toddler.
"Papy!" Frisk said, smiling.
"This is Frisk, a small mishap happened, and she's a bit younger," Toriel said, glaring at Sans.
"Oh, well maybe she'd like this!" Papyrus said, handing the unsolved cube to Frisk. Frisk squealed in delight at this, and she began to play with it. Papyrus smiled. "You are so cute tiny human!" He said. Frisk giggled and reached for him. Toriel giggled and handed Frisk to Papyrus. "I bet I can make you laugh!" Papyrus said, hiding his face with his hand. "Peekaboo!" He said, removing his hand. Frisk giggled at this. Papyrus smiled. "You're silly, you know that?" He said, tickling Frisk. Frisk giggled and squirmed in his arms. "I knew I could! The great Papyrus triumphs again!" He said, still tickling her. Suddenly Frisk stopped giggling. Her eyes welled up with tears, and she sniffled. "What's wrong tiny human, d-did I scare you?" Papyrus asked, with a confused look. Frisk buried her face in Papyrus's scarf and cried softly. Toriel knew immediately knew what was wrong, and she took Frisk from Papyrus. "What's wrong, did I scare her?" Papyrus asked, concerned.
"No, she just had an accident," Toriel said, trying to comfort Frisk. Frisk tried to hide her blush and tears by covering her face with Toriel's ear. Toriel took Frisk upstairs and to the bathroom. She looked through cupboards and drawers. She eventually found a pack of diapers from when Asriel was a baby. She changed Frisk and took her to the bedroom. "I think you could use a nap," she said. Frisk yawned and nodded, she rested her head against Toriel's shoulder, and fell asleep.