If I am ever doing a plot line that I don't want other people involved with, I do it in party chat. Plain and simple. 90% of my RP as a criminal RPer is shady shit that I don't want unrelated parties having anything to do with.
Saves people the embarrassment of being told they're not allowed to RP with us, saves us the headache of trying to explain why it's private.
Saves people the embarrassment of being told they're not allowed to RP with us, saves us the headache of trying to explain why it's private.