I think maybe I havn't expressed myself clearly:
I seem to be having the same problem, apparently, so this is my last attempt. I guess I can refer back to these answers when this comes up again, as it assuredly will.
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Many readers face the same problem you have.
A story will (after some time) suddenly have NTR, or side character POVs taking precedence, or the MC will resolve things in a manner that's too limp-wristed, or a random crossover element appears, or a character is bashed/flanderised, or some reveal about the worldbuilding misunderstands how biology/economics/society works, or a distracting bit of fanon shows up, or a romance will happen with the wrong person, or the wrong way, or a particular common cliche appears, or an unexpected loss/traumatic event occurs, or…
You get the picture, hopefully. Things happen as a story progresses, things that were not forecast from the start, things that some readers are unable to ignore and causes them to drop the fic entirely. It's unfortunate if they feel they wasted their time, or it causes them emotional distress, but forcing authors to include trigger warnings for everything that might cause such a thing is ludicrous.
You obviously aren't asking for
everything to be tagged, just your specific pet peeve. We, the staff, aren't going to give special treatment for your case. There are many websites, including ones that carry smut, that do see a meaningful difference between a fictional child being killed, a fictional child being raped, and a fictional child taking up an annoying amount of word-space, but QQ does not. It's all just text to us.
People being able to write whatever fetishes they want, without interference from moderation, was literally what caused QQ to be created, and most of its growth. It's been almost 13 years now, and people have been writing underage characters getting it on this entire time. If you want a long-term relationship here, you're just going to have to accept QQ as it is.