Someone told me about that. Now I know that's my mistake. Thank you for replying.
But still, "Incest" and "step-incest" are NOT the same thing.
So, already I requested step-incest tag. I just really hope they add the step-incest tag.
(Disregarding the fact it doesn't apply to this game and you have had a strange download)
While this would make sense (doesn't have to be "step" but could extend to other families) I doubt this will be added.
Whether "step family" is an interesting concept as a kink/taboo in many cultures, in some it is less so, maybe not at all in others. But also that can differ between a step sister (more okay) and a step daughter (generally more frowned upon, Woody Allen notwithstanding) or depend on how long you actually have been (step-)family and how long you know about the "step" part. And how much that all affects you to satisfy your kink or gross you out will depend on your upbringing. I don't think there is a way to satisfy all possible combinations without tags going overboard, even if every single addition would make sense on its own. At NTR you have people differentiating for scenes with a previously existing lover of your love interest - for some it is triggering the NTR king/gross out, for others it isn't. There's tons of transformations which may be received differently. And yet in my opinion the major (and also not solvable) problem with tags is that they are "on/off". So anything happening at all will trigger the tag, even if it happens only once and will not really disturb most disliking the tag and definitely not satisfy those looking for it.
So tags will always just be a guide, and IMO changing that would mean they need to have the size of a full blown review while not really being searchable anymore.
Again, this doesn't mean your suggestion wouldn't be sensible. But so would hundreds of others and somewhere a line needs to be drawn.