He's prepared.

"Fuck...." he muttered feeling the pressure of her teeth. "You think you're the first slut to try this." He said through gritted teeth.

A blade flashed quickly into Aurélie's view before dropping below her neck. She could feel the sharp metal press to her throat. The Doctor had dealt with this type of deception before and was prepared for it.

"Move those teeth back now and I won't cut that little throat of yours." He threatened. "And I may be merciful enough to allow you to keep your teeth afterwards. It wouldn't be the first time I've pulled a ****'s teeth for biting."