Ta maîtresse est le papa de ta copine

Lady Valeska and her strap on just had a very fun night with your girlfriend. Well, you weren't satisfying her.  So, Lady Valeska is your Mistress, but your girlfriends Step-Daddy. She spares no shortage in all the detail of the things she has been up to, that you couldn't see, let along be part of.   Of course, it sounds like Lady Valeska will be coming over to service your girlfriend more often, but no, you won't be involved.