No one heard or saw what Frisk was doing, they weren't scared they didn't run, Sans watched Frisk's harmful crimes. They just followed what Sans was doing, being calm and happy, except no one knew, that he wasn't really calm.
What he had thought of before, went together perfectly, like as if they were combining, or breeding, it was weird.
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Blue Lips- Undertale
Short StorySong- Blue Lips- Regina Spektor The story of Sans and how lines in the song can fit with Sans