Upload & Sell: Off
She looks extremely comfortable and sexy. He appears stiff and forced in his posing. I'm not sure that was the case but it translates to that in the pics.
One thing that might help, and maybe you tried this, is to get the client's mind on "sexy" things that the two of them have done. A sexy memory if you will. Get them talking about that. Then step back and let things play out.
Anyway, she looks like a gorgeous model and that dude is lucky.