A/N: Please, PLEASE check out my other stories, and then vote on the poll I have. Any reviews are welcome, whether they're suggestions, questions or even the pseudo-troll, "dis ish good" type reviews. It's nice to know that people actually read what I write.
Sans froze. The mystery kid had something familiar about them- maybe it was the eyes? And Frisk was in trouble, as far as he could tell. Toriel was going to kill him if she got word of this. It seemed like the whole room was a lot darker than it was. The kid looked daggers at him. "Don't just stand there!"
Sans flicked on a light and ran over. Frisk looked to be sleeping, but her breathing was a bit uneven and every now and then she would toss and turn like she was having a bad nightmare. He glanced up at the strange kid, and saw something in their eyes- a flash of knowledge, as if they knew what was going on and they were trying to keep it a secret. He wasn't surprised- he knew nothing at all, and this kid that popped up should probably know why they randomly manifested in a repurposed bedroom.
"What did you DO to them?"
The child instantly processed the words and looked up, looking equally offended and livid. "What do you mean?" They were taking deep breaths and managed to get out some poison-tipped words in a saccharine tone of voice. They weren't finished speaking, and their voice came up in a vivid crescendo as they asked "Why are you assuming that I did THIS to my ONLY LIVING COMPANION?"
Sans recoiled, an audibly sharp intake of breath closing in on his lungs. He didn't want to trust the kid, but they seemed to be the only source of information here, whether he liked it or not. "Okay then… What the HECK happened?"
Nobody was pleased. The animosity and negative energy flowing through the air was so thick, you could practically see it. Frisk was thrashing around even MORE then she had been before. It was hard to think, but both of them knew that if this broke out into a verbal battle royal, nothing would be accomplished. The kid at first used as many words as possible to explain as little subject matter as possible, but quickly realized that if they wanted help, that wasn't how they were going to get it.
They tried to put together words to describe the situation, but got fed up when they couldn't figure out a coherent explanation, they just released an ugly yell and grabbed Frisk by the scruff of her neck and started shaking her.
"Woah, woah, woah, woah…" He tried to calm the kid down and separate them like how an astonished guardian would, because that was how he felt. He carefully laid Frisk back down on the ground, but noticed that something had changed. Her breathing had evened out, and the mystery kid was letting out sigh after sigh of relief.
Frisk's eyes drifted open, although they had rolled back and seemed either dead or unconscious. The mystery kid grabbed Frisk's arms and lifted her up on their shoulders. "Don't you have a couch or something somewhere in here?"
By the time that Frisk had been relocated to a couch to sleep (now peacefully), it was within 10 minutes of when Toriel had planned to come and pick her up. Everything was quiet for at least a minute, before the curiosity became too much for Sans to bear.
"But really… what happened?"
A/N: Yay for cliffhangers.