If I remember correctly, murder. If your stats with Bree or Sasha aren't high enough, when Kylie assaults the MC, she can kill one of the girls when they come to help you.
I can't get Bree threesome with Dwayne. I already got 100 lp and 100 submissive points. I did all the prerequisites. Doing 'work' or 'work harder' doesn't trigger it.