@Remus2
You might surprise yourself if you sat down and made a serious effort to define your comfort zone on paper.
Actually, it is nothing like that at all with me, it never has been.
I really do not have any "comfort zones". I write stories, and if that story takes me to something I am not comfortable with, so be it. My issue often comes about when some then aspect of a story just gets me "stuck". And it has nothing to do with comfort, they can frequently be doing something I had them do before, and will do again.
But for some reason, normally when that happens it is because somehow I know that doing so is "wrong". As in wrong at that time, place, or with that person. But it is subconscious I think. Sometimes breaking away and moving to another story clears it up, sometimes I have to restart the chapter. But then again, sometimes I just need a break then come back to it again with a fresh mind.
I have written a lot of stories that probably "squick" some readers. And while normally a writer of "light and fluffy love stories", I have written other kinds as well. Sometimes to challenge myself, sometimes because the story demands it.
Snuff, rape, transgender prostitution, even castration. STDs (including HIV), 2 crossdressers picking each other up and not knowing it. I do not like horror at all, but even wrote one that is kind of a "nightmare Groundhog Day", where the one revisiting the same day is obviously insane and enjoys torturing people, even describing to one gal how he had raped and killed her over and over again, including disemboweling her and draping her organs over her as she lay dying.
So actually, not much is outside my comfort zone. But there are things I will never write about. Rape is never something to be enjoyed, and I will never describe it as other than brutal and preferably with the rapist "getting what is coming to them" in the end. My favorite so far was having the penis severed while it was inside the girl he was raping, that one felt fitting.
In fact, almost my entire "Dark Tales" anthology series is like that. "Once Again for the First Time" actually was going to be one of those, but I felt ultimately it should be posted by itself (especially as I may choose to revisit it again someday). The "main character" is cruel and undoubtedly insane by this time, but the setting still fascinates me. Almost the exact opposite of my usual stories.
Case in point, in "Dire Wolf" I got stuck because now I know the sexual situation Di was starting to get into was not right. And when I return to it the last chapter and a half will be scrubbed. Kinda similar with CBCG. Pete started to get into one, and finally after a few weeks of reflection (while I wrote several other stories) I just decided the situation was not right, so excised most of it and went on with it never happening. And I have finished 4 chapters since then now.