Get's distracted.

The Nurse has to keep working your penis but that did not mean you had to stay quiet. You spend a few moments clearing your mind of all the pleasure you look into the eyes of the Nurse. Bitting your lip a bit you start to talk to her about her own arousal. If you could just distract her a bit you may be able to win this. That seems to work as her grip loosens and slows down and she closes her eyes and listens to all the ways you want to please her. You explain in great detail how you want to suck her Breast while you use your hands to focus on all the sensitive parts of her vagina.

Seems like you got to her as she blushes. Then she returns back to stroking you.