The creator has repeatedly said there won't be any NTR. The community has already ripped into them over the announcement of the Bad Endings, to the point where discussions had to be be moved from the comments into threads like these just to keep things under control.
If actual NTR ever did end up in the game, you can be damn sure that CG would be posted everywhere within minutes. There wouldn't be any debate left at that point because every discussion would end up getting locked due to the backlash.
Now, I do think Errant Bird has a point about completionists being led into unlocking bad ending CGs, even if they'd rather avoid that content. I think the creator should hide those entries until they're unlocked, or even remove them completely so you can only view them if you choose to go down that path.