Fondle her, all over!

You move up to her, and let your hands go where they may, to her clear trepidation. First your hands move towards her breasts, the obvious target, and you slide your fingers around them. After you get a good grasp, you kneed them like dough, eliciting more muffled noises through the gag. No amount of embarrassed squeeling is likely to stop you though.

One hand continues fondling her breast. The other slowly makes its way down across her stomach, taking in the contours of her toned abs, and descends to her crotch, where you let your fingers slip down to do their rythmic work.

The smothered protests slowly give way to faint moans, and her face is practically steaming, as exponential embarrassment at her increasingly humiliating defeat mixes with involuntary pleasure. You withdraw just before any kind of climax, but leaving her shuddering, sweating, and breathing heavily - as much as she can manage through the gag. She’s not used to much.