Five Nights in Undertale AKA Sans and Frisk get a job

Night 2: Foxy's coming

A/N: in this story --"this is a text"--

Sans and Frisk prepared to enter the pizzeria for their second night on the job. Sans thought back to the conversation he had with Shard earlier. As the two made their way to the security office, Sans felt his phone vibrate. He pulled it out, and saw a text from Shard.

--"Hey Sans. Watch out for Foxy tonight. He's the animatronic in Pirate's Cove. Watch his camera, and if he's gone, immediately close the left door. Also, when you get to the Office, MAKE SURE FRISK SAVES. If these animatronics get you, it could, and probably will, result in death by being stuffed in an animatronic suit."--

Sans felt a chill go down his back.
"Hey, kiddo, ya might want to save when we get to the office." Frisk looked at him, confused.
"Why?" Sans gave a blank-socket stare.
"These animatronics will kill us if we get caught." His eyes returned to normal. "And I would make a pun about that, but I don't really have a skele-ton of those right now." He winked, and Frisk burst out laughing, despite the severity of the situation.
"Okay, okay. We're here now, so I'll save." Frisk closed her eyes, and concentrated. Soon, a small golden star appeared in front of her. 'The thought of surviving the week fills you with DETERMINATION.' Frisk felt a save file being created, and grimaced, remembering the hell she went through in the Underground.

"What... Afraid I'll kill all of your friends again?" Frisk's eyes widened at the voice. It was a voice that had brought them all of the hell of the resets. All of the genocide timelines. All the torment.
"Ch-Chara!?" Sans froze when he heard that name. The name that had haunted his nightmares ever since the monsters had arrived to the surface. Sans' left eye flashed cyan, and he stared at Frisk, seeing the demonic child holding onto them. He flashed Frisk's soul blue. Frisk was barely affected, used to training with Sans on a regular basis and this being one of his usual attacks, but the same could not be said for Chara. The demon crashed to the floor, an audible sound being heard, but not drowning out the metallic running heard in the east hall. Sans thought back to his texts with Shard, and immediately ran to the door, closing it. The sound of metal hitting metal could be heard, and a fist pounding on the door. Metallic footsteps could be heard walking away, and Sans sighed with relief, but immediately tensed up when he saw Frisk. Or what appeared like Frisk. However the teen girl in front of him had a noticeably larger chest, a green striped sweatshirt, rosy cheeks, and black eyes with red irises.
"Hiya, Sans. Been a while, hasn't it?" Sans stared at the teen in front of him.
'What's their plan...?' Chara, who was playing with a knife she had found... somewhere, used the tip of the blade to close the right door, and threw another knife to open the left. Sans heard an angry bird chirping, and used his magic eye to look out the right window, where he saw an angry Chica. But for a moment, a fast enough one to make Sans question whether he was hallucinating, Chica turned into a yellow haired young girl. Sans wrote it off as a hallucination, and stared at the genocidal demon in front of him.
"What are you doing, Chara?"
"Why, helping, of course." Chara gave a off-putting smile, and Sans glared.
"Just give Frisk their body back." Chara giggled.
"Now, Sansy, why would I do that~?" Chara then vanished, and Frisk was in their place. "Hm. Didn't expect you to take control so soon. Oh well, there's always next time~! Better watch your back, Frisk... Sansy..." And with that, Chara vanished into the recesses of Frisk's mind. She sighed with relief.
"Well, glad that's over." Frisk then heard running, and saw a blur of red behind Sans. "Sans, look out!" Using the knife Chara had pulled out, Frisk threw it at the blur, which she deduced as Foxy. But it hit too late, as a jaw clamped down onto Sans' skull. He looked at Frisk, in both shock and pain, before turning to dust. Frisk just stood there, numb. She didn't register Foxy dragging her to the back room, nor the animatronics stuffing her in a Fazbear suit. In fact, she didn't register anything until time rewound back to 12:00. She shook her head, disoriented, and broke down crying. Sans, having not experienced death for a while, was shaken, but otherwise fine. He walked over to the sobbing Frisk, and hugged her.
"Shh, it's okay kiddo. I'm right here. Glad I made you save, right?" Frisk nodded, and took the security pad. "Hey kiddo." Frisk looked at the big boned skeleton. "Try not to scroll through the cameras tonight. Just watch Foxy, alright?" Frisk nodded, her voice sore from crying, and noticed that the fox was gone. She was about to tell Sans, but he had already noticed. He closed the door, and could hear an angry screech on the other side, followed by a fist pounding on the door. And finished with fading grumbling. Sans sighed, opened the door, and closed the right door, seeing Chica about to get in the office. It stayed relatively like this for the majority of the night. But at 5:00 AM, the proverbial shit hit the proverbial fan. Frisk had lost concentration, and hadn't noticed Foxy gone. By the time she did, he was already jumping at her. She screamed in terror. Sans, who had been at the right door watching for Chica, heard the scream. He turned around to the sight of Foxy jumping at Frisk. His left eye flashed its usual cyan-blue color, and he found that Foxy had a soul. Convenient, because now he could turn said soul blue. He did so, and Foxy's Gravity increased, sending him plummeting a foot or two to the ground. He grunted, and tried to stand up. Sans then used his magic to pick Foxy up, and throw him out the door, and turning Foxy's soul back to normal. Foxy, having gotten the memo, walked away. The two night guards never heard from him again that night. The rest of the night went pretty easy as well. And when 6 AM rolled around, Frisk bolted out the door and back home. Sans chuckled, and was about to walk out when he felt something behind him. He turned around, and found a golden, almost rotted version of Freddy Fazbear hunched over on the night guards table. Sans was sure that it hadn't been there at all during the night, and used a check to see if it had a soul. He found one, but discovered that the soul was hiding itself. He then saw words flash in front of him.

I KNOW HOW MUCH POWER YOU ARE HIDING

And with a bit of static in his vision, the golden bear had seemingly vanished. Sans thought for a moment.
"Heh. So that's how that feels." Before thinking about the weight of what it had said. He frowned, before taking a short cut back to his house for a much needed nap.

~Generic transition is generically generic~

A figure walked out of the shadows of the end of the east hallway once Sans teleported out. The figure had golden hair, unnaturally pale skin, and black eyes with white irises. "Hmm... Sans the Skeleton... How interesting you are. You, along with that very determined girl, might indeed be able to save us all... Including him..." The figure then vanished. Having teleported to an unknown location. Elsewhere in a sealed room in Freddy Fazbear's, in a room full of old animatronics (a few notable ones include a slightly charred and corpse-less Springtrap and Toy Bonnie), a lone music box which had stood still for years began to stir...