Sans's eyes shot open, his head still ringing with the twisted words that had haunted his dreams. For a second in the realm of being not-quite-awake-but-still-conscious, he had wondered blankly if he was in his room. Every time he dreamed, it ended with something ridiculous like that and he ended up in his room. With each passing instance, he became less and less sure that each time was a dream.
There were nightmares, too. The kid would come through like always, but they would be rough. They would kill his brother, or even EVERYONE. But even when he confronted them, he never won. They would always plunge a knife or a bullet or something into his chest at the last second, and taunt him in a twisted voice with a sickening smile at the end. But then he would wake up back in his room, shaken but physically fine.
He had never seen the Surface in any of his past dreams.
When his eyes burst open, he was lying on the park bench, where Frisk was sitting next to him. An echo of the dream flew through his head, but he couldn't assemble it. He sat up, and looked around. The crowds had vanished, as had the time shield and both nekos. He looked over at Frisk.
"What did I miss?"
Frisk smiled sheepishly and signed with shaking hands that she wanted to start heading home. They started to wander out of the schoolyard and into the plaza. Sans noticed that it was only a few minutes after he had remembered the time shield first going up. Apparently he had slept through the whole thing. He shuffled around in his pocket, looking for something to take his mind off of what had happened. He didn't find anything.
It wasn't a long walk back to his apartment. In fact, it was only a few blocks down from the plaza. The plaza wasn't half as busy as it had been. As soon as they got home, Frisk started typing something up on a laptop and Sans tried to read a mildly intellectual text, but couldn't keep himself awake for long enough.
He woke up to a doorbell ringing. He went over to get the door, but when he got close, the ringing stopped. He wondered where Frisk had gone. He called around for them, and checked a clock. Thank goodness- Toriel wasn't due to arrive for quite a while. He started searching the apartment, looking in every room, calling over and over again.
He finally looked in the library. It was dark in there. He turned on a light, and found a strange child in a green shirt kneeling over Frisk, who appeared to be sleeping. Something was particularly ominous about this. There was an echo rolling through the room. The mystery child looked up, and saw Sans. "DO SOMETHING!" they yelled. It was an angry yell. And a familiar voice.
It looks like we've got quite the interesting problem here.
A/N: My excuse for this entire chapter can be summed up in 3 words. Writing is hard.