It’s very good for the man to focus directly on a clitoris in this way, it is the most masculine (like a mini penis) part on a woman’s body that he understands.
She’s rubbing directly on her clitoris, the clitoral head itself being very exposed and quite consistently. You can see she’s so very focused on her clitoris, much like a teenage boy with his penis glans. It will be difficult for her to enjoy PIV sex with so much focus on the clit head, perky and ready to be burst like a berry by the tip of an eager tongue. The clitoral glans is extremely exquisite in sensitivity; no man will ever understand this heightened level of pleasure.