So to me, that's just a no-brainer. The student has nothing over her, and she should ignore any and every attempt at blackmail he makes.
Why you are so focused on the blackmail?
No one will blackmail her
She do this on her own.... she just try to found excuses to Fuck with her students
She is the teacher and has to find reason to have sex with Marcel..
The only problem for her is to save her reputation but we all know that having a good or bad reputation does not depend on us
The world is full of people who gossip... she tends to maintain a facade of reputation only in her thoughts
She knows she should have accepted Brian's ride to home but she didn't ....SHE DIDN'T DO IT ON PURPOSE
She just thinks to herself that she is a respectable woman
but believe me she is not
I have known many women like her; they think they are good respectable girls but at the same time they hope to be raped...
Vivian is looking to be raped since she decided to remove her ring by going to drink a beer alone in that bar
In this case she is blackmailing herself for some reason!
Vivian loves to be adventurous