Not sure what it is about this that makes me instantly read the guy as submissive. Is it that she is ‘taller’ than he is in the image? Is it the way she seems about to devour him? I think a big part is that her arms are on the outside of his, and her legs are wrapped around him. It’s like she’s engulfing him.
In all honesty, though, it’s probably that this is one of my favorite positions when I’m in charge and enjoying some time with my boy.