I don't have anything new to add, other than to echo what everyone else has said. mandy had the same problem letting go the first few times. In her case, however, it was the determination to have full-bodied squirting orgasm experience that she'd heard and read about.
It does take trust - that goes without saying - but she also needs to know that you want her to have it as bad as she does. I remember mandy's first time quite vividly. She started to hold back like she usually did and I took her by the back of her neck, pulled her closer, stuck my fingers into her that little bit deeper and gave her a look that told her how badly I wanted her to cum.
Now, she can't get enough.
