I have to say the comments on the video are awesome and I agree with you, she has to learn to have her hands behind her back, but the guy could have tied her up beforehand, that would have been awesome too
She's a fast learner... But she still has two things to learn - hands behind her back when mouthfucking, unless instructed otherwise, and when he cums she has to open her mouth cunt as wide as possible and stick her tongue out all the way to get as much sperm as possible