When I realize I was a pedo my first fantasies and interest were little girls vaginas. I really didn't like anal, I even avoided lolicon manga that has anal and I couldn't understand how there's people that prefer ass instead of pussy.
But that changed, a lot.
In this years I get some new fetish (like feet, for example) but the most radical of them was an increment in lust for anal. Right now, when I think of fantasies with pubescent, developed or mature girls; my principal fantasies are vaginal sex (as always). But when we talk about true little girls, prepubescent or lower, my fantasies are almost exclusively anal. And right now most of my fantasies are with that kind of little girls, so almost all the time my fantasies are anal.
But that's not all. I even got another fetish that's connected with that anal fixation: scat.
Most of the anal I imagine is really dirty (without any cleaning), I'm thinking in getting my fingers, tongue and (of course) dick in the dirties hole of a little girl. Also seeing a little girl shit or even have contact with that shit.
TL;DR: My biggest fetish right now is dirty anal sex with a little scatological touch in little not yet pubescent girls.
I'm curious to see what other pedos think of this, because it looks like a lot of us actually are really into anal.