I feel like originally it was a semi-safe taboo to break that made a standard porn setup seem more forbidden/risqué. It always seemed weird, like how many people have step siblings that also fantasize about them sexually, how big could this be? But it just kept on coming, so to speak.

Now I think it’s just a meme/SEO thing, where you have to include it even if the video is not even pretending to be about that. Also it happened around the same time that websites were pushing/pivoting into more content creator type things, and so it’s probably related to that as well. Like the annoying face+exaggerated reaction thing on YouTube…

Either way, always seemed whacky that everything the sites serve is almost completely step-porn on the front page.