>>8078562Futachad here. There's different subcategories of futanari. So futa x female is just a futa banging a girl. Sometimes this is enough for some to consider it futa yuri, especially when we're just talking about pictures. However true futa yuri, in regards to doujins, treats the futa dick as secondary to the interactions between the futa and the girl. So basically the same shit you'd see in yuri doujins (sensual touching, kissing, caressing, etc) just with penetration towards the end.
Most futa x female porn will focus mainly on the futa's dick (how big her dick is, how much cum her dick shoots out, etc) and the sex tends to be rougher compared to futa yuri. The pleasure of the female is usually secondary to the futa's pleasure.
However there's no hardline definition either way. I'm just describing a trend that I've noticed over my years of reading futa doujins. Thanks for coming to my ted talk.