Marin is the maid in the mansion that tells you, how too get to the Prison. (You can visiter her by going upstairs and then to the right, after finishing Rinny’s quest.)
Who do you mean by Master?
As far as I know, its still impossible to meet the succubus queen. And if you mean Pixie: The only interaction I know about right now should be in her lair, you can feed her pets and take Rinny with you too feed them together.