"Can you keep masturbating like that without cumming?" she asks suddenly.
Yes, you assure her that you have lots of practice.
"It's important," she says seriously, "if you cum we won't be able to see the higher levels of arousal!"
You nod, as you are too turned on to respond verbally.
"Good boy!" she says excitedly, and then she kisses you deeply.
Her kiss is so unexpected and overwhelming that it nearly causes you to lose control!