pet peeve that i really hope doesn't get me yelled at:
fictional smut of fictional children, i don't care if you find it morally disgusting or whatever, i get it, even in my solidarity being pedojacketed i try to filter it out wherever i can because i am personally super uncomfortable with it
but no matter your moral disgust, it's not child porn, and it's certainly not CSEM. those are real terms for real harm that are used for seeking out real people who abuse real children, and organizations who actually work to help children abused in these ways have repeatedly begged people to not report fiction because it gums up the works of them searching for real reports
even if you personally think fictional smut in that way is an inherent harm to society (which i disagree with, but that's a different subject), you should at least be able to agree it's less bad than real children being hurt. and every time you water down the term CSEM it bogs up the works for the bigger problem.

