"devilshub?" I am not familiar with this
My mistress name is Charon. I instruct them to research this name if they wish to continue our "game"

I provide scotch to both of my slaves. I am aware they have been drinking beer, how bourgeois! So they are not able to drink wine, my favorite.
I ask vampire to introduce himself after he is done I ask our "slut/slave" to introduce herself.

I explain to both that I am a professor of history at the university. I am sure they willl eventually discover my true identity.
I make it quite clear to both that I have access to their total student records. If they disclose my "other" side I will provide their family and friends with sordid details of our relationship.

This is a severe threat but one I must make none the less. I will introduce them to new worlds BUT my secret personna must remain secret.
They both agree and we continue to drink while we get to know one another better.

I believe the girl in the slut costume has come to realize she will be serving two masters. Perhaps more than she is prepared to do.