A scene with two people is more than twice the work of a solo clip. Someone has to hold or place the camera, both people have to be ready at the same time, and the scene has to work for both.
Camera
Couples mostly use a fixed camera and a second handheld one. Groups often have a third person filming. The best scenes keep both faces and the action in frame.
Timing
The hardest part. Many couple clips are built around one partner’s moment while the other reacts, because two at once is rarely possible.
Consent on camera
Good creators show or say that both take part willingly, especially in domination scenes. It makes a scene more believable, not less.
See the couple rows on the front page, or read about real scat couples.