Fair enough, but have you considered, per chance, that she's very hot? That changes things. She's not some Jabba the Hutt (e.g. your average american), but a very good-looking MILF who you can do thing to and with. I'd love the option to use them both (separately, I'm not big on the incest thing), but they both know about it and Isabella gets more money/perks from it than Britt. Which creates even more tension between them, potential jealosy (if Britt develops Stockholm Syndrome) and maybe even a catfight. There's some strong potential for a good juicy drama.
As for Kotor, I'd play Guy as Dark Side Atton - corrupting them, seeing them fall is the best. There's never enough misery in the world, we all must do our part to contribute to it!