You don't even need to go as far as FUCK ALL THE RULES for this one, you could just have Rose try to do the kismesitude with Vriska, and just not be very good at it, so it more often leans red than black, and Vriska mocks her for sucking at it, which irritates Rose to no end and Kanaya steps in before they kill each other and etc. etc. I think that would be a really interesting way to go about it, but that's just me. You fuck those rules if you want to, more power to you.

But yeah. Good pairing. Good OT3. You go do it.