Tease her

"How about I give you one last orgasm before you go in the belt for a while?" You ask, putting on your most seductive tone of voice.

Kendra nodded vigorously. She laid back, arms above her head, while you retrieved a length of rope from the nightstand. She was squirming, rubbing her thighs together as you slowly, deliberately tied her hands to the headboard. You continued to move slowly, dragging your finger tips along her torso, over her breasts, down her midriff, past her hips and onto her thighs. You put your head between her thighs, and gently lick her clit.

It doesn't take long for Kendra to start straining against her bonds, her breath labored. Just as she's about to crest her orgasm, you withdraw entirely, grabbing the chastity belt from the foot of the bed. As Kendra whines and struggles, you wrap the waistband around her hips and bring the rest up between her legs, closing off her sensitive clit and wet, aching slit.

Then you sat there, rubbing her thighs and her stomach as she continues to moan and writhe. When she finally calms down, she looks at you, biting her lip, and breaths, "you're just slightly better at this than I'd thought you'd be"