With her right hand cupping and circling his balls, tugging them down and away to slow his ability to cum, she began a more forceful and determined stroking of his cock with her left hand on the shaft, but never quite going over the highly sensitive head. The result was an intensely frustrating urgency to cum without getting quite the stimulation needed!!! Helpless in the restraints, he tried vainly to reach for her stroking hand, wanting desperately to make her push him over this unbearably erotic edge. But she had cleverly fixed the restraints so that his hand was just not able to reach her, making his frustration and desperation grow, which she enjoyed immensely!!