Sans felt like he was being watched. Ever since he ran into the blue masked man, he felt it. Always watching, always waiting, but never making a move against him. He could never pinpoint the location either. It always felt like whoever it was was... everywhere? He didn't know, but it kept him on guard. He never went out alone during the day, just in case. He really didn’t have a choice during the night. Murder was murder, even if it was to keep himself alive, the others probably wouldn't understand.. He was alone in this..It started with a drawing. That's when things really picked up. He couldn't even call it a drawing, it was just a circle this a x crossing through it. The day after he found it pinned to a tree in his yard, Sans became aware that he was being followed. They were good at hiding, but he could feel their souls nearby. He was positive that they were following him. On occasion he could get glimpses from his preferal vision. A flash of yellow or brown. 'Who are these guys?' He somehow doubted that they were government spies, still, if they became a threat to Papyrus... Sans would kill them. That was a promise.

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"EARTH TO SANS!" The skeleton went from watching his stalkers to looking at Papyrus. "yeah bro?" Papyrus looked behind them. There was nothing. "WHAT WERE YOU LOOKING AT?" Sans gave a shrug. "that bug." Papyrus grew confused. "SANS... THAT'S A CAR." Sans snickered. "that's what the car is called, bro. i was just wondering how many skeletons you could fit in it."
"NYEH! STOP IT SANS! WE DON'T HAVE TIME FOR YOUR TOMFOOLERY!" Papyrus scoffed, turning back around. "WE MUST NOT BE LATE FOR HER MAJESTIES BIRTHDAY!!"
"i'm coming, i'm coming.." He reluctantly followed after Papyrus as he pinpointed the three's locations. One on the closest roof, one in an alley, and one behind the very bug they'd been talking about. Then there was still the fourth set of eyes... the ones he couldn't locate, but were always watching. The ones that he couldn't tell if they were foe... or friend. It was complicated. There was never hostility in the feeling of the last stare, no it was more like curiosity, maybe even a sort of expectancy? Sans didn't know.

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"happy 143rd birthday tori, you don't look a day over 30." Sans praised his pun buddy. "YES, HAPPY BIRTHDAY LADY TORIEL!" Toriel chuckled. "Thank you boys. You are to kind." Frisk, having heard Papyrus, came running in and hugging us in turn. He tensed. All Sans could ever see was how they killed. Over and over and over. The dirty brother killer that was unaffected by time because of the resets. He patted their head and they switched to Papyrus who gladly hugged back. If Sans was being honest, if he didn't know that Frisk could reset to the beginning like always, he would've killed them first. They would have been his first victim to keep his HP up. "H-hi S-Sans... P-Papyrus.." Alphys greeted as Undyne tackled Papyrus. "Glad you guys could make it!" Asgore poked out from the kitchen. "Tea anyone?"
"I'm down!"
"S-sure!"
"Yes, thank you dear." Toriel thanked as Frisk gave a nod. "nah. i'm chill." Frisk looked confused. "It's the beginning of fall, it's not cold yet." I shrugged, wandering over to the couch and looking out the window. "it's cold somewhere, it still counts."
"THAT WAS TERRIBLE!!"

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Sans stepped out while they were all doing cake and ice cream. He was going to get to the bottom of this whole stalking thing, and tracked one of the soul signatures to a secluded park. It was there that he saw a man in the shadow of a tube slide. He had a yellow hoodie with a black mask with red dots and a 'frown' on it. He wore jeans and brown boots as well. "hey man, have you been following me?" Sans took a step forward but the other souls closed in. He whirled and ducked in time for a crowbar to whip past him. "what the-" The third jumped behind him, restraining Sans. His magic flared as he tried to shortcut away, but something hit his vertebrae. "ow!" It was a... Sans mind was already blanking out and growing hazy, his body got sluggish. "Slender will be pleased." One of them said. "I wonder why he wants a monster though?" If there more conversation, he couldn't understand it. He could no longer see, no longer hear, no longer move. He was at the mercy of these men and 'Slenderman' as they'd called him.