Woken.
(*Ring, ring...)
Sans picked up the phone the moment it went off. Toriel's been gone for a long, long time now, and it was getting uncomfortable for everyone to wait. Did something happen? When he checked the number, he realized it was Frisk. Sighing with relief, he answered. "*heya, kid. where have you b-" He was cut off by a small, scared voice. "*S- Sans, something happened..." He stood up immediately, opening his door and rushing down the stairs, not bothering to turn off his lights or stow away his documents.
Undyne, who had resided in the room next to Sans's, heard him speeding down the steps. What was he doing up this late? She had been waiting downstairs in case Frisk or Toriel showed up, and just came in to check on Alphys, who had some rare nightly terrors from her experience with the Amalgamations. Undyne hated seeing her hurt from that...
She opened the door quietly, only to find Sans running downstairs. He was holding a phone and wearing a distressed expression. "*Sans!" She said in a quiet voice, not wanting to awaken the home's occupants. "*What's wrong?" He turned to her immediately, replying with the same voice. "*frisk." She didn't need anymore convincing. Undyne nodded, closing the door softly and following the skeleton downstairs. She wouldn't take no for an answer, and Sans wouldn't deny help, she knew.
"*where are you?" It was comforting, to say the least, hearing Sans's surprisingly calm voice, though it seemed evident he was running down the stairs. Frisk wasn't expecting him to still be awake, but they were happy he was. "*MT. Ebott," they replied, hoping he'd get there quick. They had this burning feeling of guilt and terror in their soul. What had they done? The only thing they remembered was Toriel... then dust. It scared them thinking about what happened, what Chara had made them do. The worst part was that the dust refused to stay off of their clothes, only reminding them.
"*jeez, kid. how'd you end up there?" Frisk didn't want to reply. Chara's influence was whispering for them to attack. "*Kill them... kill them all..." There was just that whisper in the back of their head, trying to overpower Frisk's MERCY. They shook their head, trying to will the other away, though in vain.
Sans arrived at the bottom of MT. Ebott, panting, having run almost all the way, though Undyne had hardly broken a sweat. Frisk must've been at the end of the cave, where the barrier once was. They started up the mountain, as fast as the two could go. Where was Toriel? ...Did something happen to her? Sans shook his head. She's perfectly fine, probably with Frisk, right? He and Undyne came upon the dark entrance, looking for the human. They didn't dare shout the name, though. If something was there that wanted to hurt Frisk, they didn't want to attract attention to themselves or the kid.
Now, Gaster himself wasn't one to enjoy rude awakenings like, oh, dying but ending up in the void, and then being forced back into reality somehow. But it wasn't the worst thing in the world to come back to life, many years after death. He was in what seemed to be a basement when he came to, though where, he wasn't sure. There was that machine he had stopped working on long before falling into the CORE. How was it working? ...Was it his son?
Definitely a possibility, he thought as he took a look around him. Notes and some blueprints were scattered on the tables and the floor. Yep, this was Sans. But how had he gotten this to work, and where was he? This didn't feel like the Underground. The air seemed so fresh to him. Could he be on the surface, perhaps? Another possibility, for sure. He hadn't seen much since he fell.