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This was ages ago, but in short if I recall: My comment was originally because they refused to clarify who was being pleasured and what the fanfic was about. (Aside from a glory hole. Wouldn't say if it was a human or equine one)
And secondly: They threw a hissy fit because they were unwilling to learn how to write anything where the girls had sexual needs... or you know: describe female anatomy. And just wanted to write about penises, and how obsessed they are with them. While also asking to be made immune to criticism due to this. Very "Incompetence is my style".

Though, this was freaking years ago, so I could mix them up with someone else. As, there's at least like... 7 other authors that fit that exact description xD

Also... they're equines. Not sure what you mean with "bestiality" xD