Honestly, and I'll sound like a broken record but...
Having "(un)avoidable NTR" as tags in this freaking platform will eliminate 90% of the NTR wars. No need for devs to clarify it in comments, no need for site users to ask in the thread, and no need to talk about the length or frequency of the NTR part in the story. 90% of the NTR hate brigade will be filtered by the tags alone. it avoids all the harassment that devs get to endure everytime because of a limitation in platform categories. This is a platform issue, not a dev issue.
I have no idea why f95 admins don't add a couple of tags. Even if introducing it means revisiting other systems (like search) to account for it, the solution is trivial. Just slap in a relational key such as "parent tag" on subtags, referencing NTR in this particular case, and take it into account when showing regular NTR results. The idea should be the same for any other subtag, and it allows for the eventual deletion of the parent tag if that's wanted eventually.
It shouldn't be rocket science, and it's very low risk both technically and operationally