This game sounds super fun- can't wait for the finish results....I had an idea but not sure if it will work in your version but the game could involve the Mistresses acquiring and collecting tools (that can be used on our subs/slaves) to trade with each other. In reg Monopoly, the goal is the same, to acquire/collect property/rent when someone lands on them. For the Mistresses, we have build our collection of tools (cage, whips, floggers, rope set, etc) to trade with the other Mistresses who land on it and use the tools on their slaves.