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Changes in a monster’s behavior is usually done just before the beginning of a new timeline, but in very rare cases can happen during the current timeline, which sometimes breaks the world to the point where different preexisting AUs can merge into one, resulting in something similar to HELP_TALE

Some, yes. Flowey is definitely aware, Sans might show signs of having an idea that the Coder exists, idk cause I’m kinda just making up the storyline in my head.