As far as the rest goes, invite her to invite your fiance to join in a threesome! See where that takes you. They can be fun!
Der Fish
DerFish, I must vehemently disagree. Let me get serious here for a minute.
There is a poster here who rubs some people the wrong way, but some of the things he says are meant to help others navigate the pitfalls of romantic and sexual relationships in the DR.
I feel what I'm about to say is a universal truth. Threesomes are not meant to be shared by people who have any sort of ties to each other. Threesomes are fantasies that are meant to be lived out with, from the man's perspective, two women whom the man has no daily interaction with.
The poster I mentioned above told me how he knows expats who have gotten their maids (or the maid's daughters) pregnant and suddenly they don't know what to do. Suddenly their little porno fantasy turns into a Dominican nightmare they are ill-equipped to deal with.
I have no idea what type of dude chic is. The little I've been able to ascertain comes from his posts on DR1. From that, I am convinced he cannot handle doing anything about the situation he's talking about except leaving it alone. The threesome you are suggesting will make everything worse.
Casual and/or out of the ordinary sexual relationships are difficult enough to navigate. Throw in someone who seems unstable with a fiancee and her friend and you have a recipe for disaster if there ever was one. You cannot mix the two when it comes to an expat and Dominicans. Dominican men get away with stuff foreigners never could, try as they might. This is one of those situations.