Good idea.
I hope that "Domination" involves fucking the Girls (and eachother).

And a lot of cut off cocks, balls, fingers, arms, legs, eyes.
Best as "orders", that the Boys have to done this self. Like "if you really want to be a member, cut one of your balls off and eat it".

Or let one of the Boys cut his cock from top to base in two parts. The Girls then step at each side and they stretch the cutted cock really far to each side till both parts tear and then he looses, because his cock was not be able to stretched far enough.