I know absolutely nothing about Undertale or Deltarune other than that's its got a lot of very nice fanart for games that look like boiled ass, but....
Isn't this the game where the most recent news was the internet all freaking out because it was implied
that your character rapes the buck-toothed reindeer chick? In which case yeah, no wonder the parts of the internet that draw wierd creepy porn of underaged characters is gonna have a field day.

SO HELP ME GOD THIS IS NOT AN INVITATION TO EXPLAIN THE DEEP NUANCES OF PIXEL FURRY TRAUMA TO ME DO NOT
Autumn's already given in to one of her four usual compulsions and blackwashed the actual polar region animal, it's just a matter of time until she makes her fat, pronouned, and draws bad porn of her too.
Edited to add: in the five minutes between me typing this up and hitting post, she's now made her trans too. Gunt or porn is next.