Gaster

"I don't understand. All your tests are normal." Gaster muttered. Sans soul was fine, his magic was fine. He was physically healthy, and mentally so as well. "maybe i'm just stressed?" Sans offered. "Perhaps.. I don't know why you'd be stressed when we've been on a three day leave." Sans shrugged. "maybe it all just built up and exploded in that single nightmare?"
"Maybe. What were you even dreaming about anyway?" I asked. Sans closed his sockets. "i.. really don't want to talk about it."
"Was it really that bad?" His sockets opened and his voice went an octave deeper. "yes." It was unsettling to me. I really couldn't tell if this was from the machine, or something else. I couldn't find any traces of anything. I sighed. "Well Sans.. I don't see a point in keeping you. Just let me know if anything feels off."
"this whole situation feels off. i hurt the kid without any reason."
"They are Frisk. They will forgive you."
"i know they will. that's the problem."
"I don't understand."
"i just.. i don't get how they are so forgiving. why don't they ever... i don't know.. act out when they are angry? it's weird."
"I.. do not know, Sans."

Frisk

When Sans and Gaster returned, I ran to Sans. Truth be told I wanted to know his response. If he flinched, that means he knows. If he reacts without hesitation, it must have been a glitch in the timeline or something. "woah, woah, woah, kid." He pulled me in for a hug. "what's the rush?"
"Are you ok!?" His reaction seemed normal. "i'm a-ok. how about you? are you ok? i'm so sorry, frisk.."
"It's ok, I'm ok. Just some scrapes and bruises now."

Sans

Frisk let go. "I made sure mom won't be mad at you." Why aren't you mad at me? What are you hiding? "thanks kid, your the best." They ran to tell Alphys the good news. I narrowed my sockets at them. I'm on to you.

Gaster

The lab I was at was unfamiliar to me as I walked through it and into a room. On a medical table, chained was a young Sans. He was crying, screaming, struggling against the bonds. I wanted to help, but I couldn't. "Quiet down, 1-S." I said coldly. Why? Why couldn't I control my voice? Control my actions? I grabbed a syringe filled with a blue liquid. That was determination! No! Don't you'll kill him! But I injected his soul with it anyway. He screamed bloody murder. SANS! I turned to the next table. A baby Papyrus was crying there, confused, no doubt. NO, NO! HE'S JUST A BABY YOU IMBECILE! He picked up a syringe with orange colored determination. STOP! PLEASE! I injected his soul. Papyrus wailed in agony. Sans screamed again, this time more out of rage then pain. "Shut your mouth, 1-S!" There was a snapping sound. I whirled around and came face to face with a charging blaster. Then I was rocketing backwards, hp plummeting fast. Then I was falling.

3rd POV

After they returned, Gaster went to his room. It was nice and dark in there and it helped the scientist think. Something was wrong with Sans, and not just because of the nightmare. Or perhaps it was exactly due to the nightmare. He and Frisk had always gotten along amazingly. It was almost as if they were siblings. So him expressing distrust towards the human seemed rather odd. He looked more tired as well, as if he hadn't slept in months, yet he'd been sleeping the most between the three of them. Maybe it was the machine, but shouldn't there be traces of.. something? In the end, he'd fallen asleep, pondering this entire ordeal.

Gaster

The darkness surrounded me. The darkness CONSUMED me. I screamed for help, but nobody came. I was alone. I don't know how much time passed, but I learned a few tricks in this place. I could open.. windows.. to this place. It was an unfamiliar place, but Sans and Papyrus was there, and it calmed him. Reassured him. Unless that BRAT came around slaughtering. He watched them kill. He watched the MURDER HIS SONS. And he could not stand for it. But he couldn't do anything about it. It tortured him, either watching their deaths and being unable to help, or standing in never-ending darkness.

3rd POV

Gaster started awake. What was that? It was so real, but he would NEVER torture his sons. Sans would NEVER turn on him. Then there was the dark place.. he looked around and quickly turned on the lights. He never thought he'd be afraid of the dark. Then there was the child, Frisk. Now he could understand Sans' distrust towards them. If Sans' nightmare was anything like his, well.. it was the machine.. it had to be.