It’s over-done, but I sometimes like step-porn, and I’ve never felt like I wanted to do actual incest; step family or otherwise, lol. I like my porn to have some kind of minimal story/lead-up, and I guess step-porn is an easy way to do that. I don’t think I would like the very vanilla porn you described though :) Threesome, orgy, and ganbang porn is what I usually watch (if it has some kind of lead-up). I kinda miss when they used to make actual porn “movies” with some kind of plot.