My canon-era fic [and references to canon-era in post-canon fic] involves adult incest between non-humans, in a similar vein to mythological incest. My modern-era/post-canon fic involves age-gap relationships between consenting adults who met as adults. I do not condone or support incest IRL and I usually do not think relationships involving large age differences are a good idea IRL; fiction is not reality. There are complicated reasons for why I write what I write, and I would encourage you to read the character sheets for Fëanor and my OC Sören before making assumptions. Any sex in my fic involves adults over the age of 18, I do not write minor/adult and I absolutely do not support it IRL [I am a CSA survivor].
Having said that, I also feel it is a moot point to make any kind of disclaimers about what I do or don't support considering I largely do not interact with fandom and keep to myself, and as of fall 2024 I have stopped blogging.
I also believe that the era of fandom where we are now required to constantly make disclaimers about our content is Bad, Actually. It used to be that back in the 00s people understood if you wrote certain kinks, or you wrote darkfic, it was not reflective on you as a person and stuff you were into IRL. The trend towards Purity Policing a hobby of writing fiction is disturbing considering how censorship tends to lead towards silencing or harassing marginalized groups.