Maybe Sepanta, Levy and many of the other social media porn performers are turned on more by themselves than by their partners/collaborators. They have a kind of narcissistic auto-eroticism.
They appear to be staring fixedly at you the viewer but in fact they are staring, mesmerised, at their own image in the selfie camera, getting off on watching themselves getting off.
I always think this when I watch Leo Stuke. He's in his own bubble, even when he's collabing.
These guys are usually at their best in solo jerk-off vids.