@TakoAlice8 You are quite right that Size porn is similar to vanilla porn in that most the F/f stuff is made by straight men for straight men. Complicating this is the fact that 3D rendering—which allows some of the most creative and expressive poses and scenes in size fantasy—is restricted to the variety of character models developed and sold for it. This means most render artists are stuck using models designed for the (straight and gay) male gaze.
Off the top of my head, when I try to envision what I’ve seen that could be called butch lesbian giantesses, I think of some of the drawings that I used to see on Tumblr. I’ll keep an eye out for this kind of content, and if I find any artists that have that kind of vibe I’ll update this thread.