You would rather keep your dignity.

How dare a mature adult take advantage of a young girl like you! This is disgusting. Calmly you look at the teacher. "No thank you sir. I would rather prove my worth as a student.".

Looking over your still naked body the teacher grins. "I am sure you will slut."

You stand completely dumbfounded for a moment. Did a teacher just call you slut? Before you can retort you see that you are once again alone. You quickly walk to the door and slam it shut and lock it.