Young Alter runs towards the purple door. He looks behind him, crying and running. He starts banging on the purple door. "Let me in, please. Please!" His voice cracked as he pled. He sits down by the bush and hugs his knees. He looks at the metal plate on his hand, growls and cries more, and in anger, he tries to tear it off. He pulls it off it a painful tug with all his strength. It pulled out a circle of his bones, leaving a hole in his hand. He cries more and buries his face in his hands.

"Sans." A low voice calls from in front of him.

"No, no!" Alter gets back up and bangs on the door again. "He's gonna take me away again! Let me in! Please! Toriel! Asriel! Please!!"

"They know where you belong. We're going home." A figure walks closer.

"No! Y-you're not my dad!" The figure picks him up as he fights and squirms. "Don't take me back! No! I don't want to go back!"

The purple door opens and Toriel peers out. "What is all of this commotion?"

"Oh, Queen Toriel. I was taking my son back home. He ran away-"

"Queen Toriel! Please! Dont let him take me! He's gonna expirime-" The figure sighs and covers his mouth.

"Kids.. Tiring. I am so sorry for the inconvenience, my Queen."

"That is quite alright. Would you like to come in for some tea? And maybe Asriel and Sans can play together?"

The figure tensed slightly. "That sounds lovely.. But I must get back to my work."

"Of course. Being the royal scientist, as well as a single father, you are probably very busy."

"I hope to talk to you later, my Queen." The figure bows a little.

"As to you." She closes the door.

The figure stops covering Alter's mouth and let's out a breath.

Alter struggles more. "Your breath smells like lies! Let me go!"

"Sans!" His voice was deep and stern and Alter stopped moving. "We are going home. Now."

"Don't you mean you're putting me in my cage!"

"I don't have time for this." The figure snaps his fingers and teleports.

(Fav line gotta be "Your breath smells like lies!", ngl)