A few. Yours is definitely one of the higher probabilities but I do not want to limit to just endings but a thing that is exclusive when you go pass the 45 threshold (or negative affection rate). Still in brainstorming process to implement this elegantly.
Another one is more characters but I will deviate from the taboo aspect but still in the forbidden area like a college professor, a priest from a completely fictional religion, a conservative politician, etc. This is easier-ish, since it will be less technical and just depends if the writing goddess will smile upon me or not.
With all of that being said, probably the next best step is getting original arts in there. As much as you like my writing, nothing beats a good ol' sucking and fucking in actual colors and not just texts.