Dominating Two Sisters

Mistress Legacy has two of the three Wilcox sisters in her den of iniquity.  The oldest sister, Brooke, is thoroughly dominated and is now called Brookey.  Can Mistress Legacy make the middle sister, Marina, just as submissive as her older sister?  Even though Marina is happily married and trying to have a baby with her husband?

Mistress Legacy intends to change Marina for the much worse to Marina and the much more useful to Mistress Legacy.  That includes changing her name and her body of water designation, from Marina to Lagoon. 

Can a middle-aged dominatrix like Mistress Legacy succeed and get away with sexually enslaving two young adult sisters in the same mansion, sisters who were/are heterosexual?  And one of them is happily married!

More than that, will both Wilcox sisters end up pregnant because of the dominatrix?