Schoolmasterish is quite a good one. For any role plays you do really need to know the woman well enough though. I used to give my regs in that area a choice of two scenarios to make sure they were comfortable with it as I did expect them to act the part well. One I rather liked was get her to stand in the middle of the room, blind-fold her (very lightly) and then undress her and examine her naked body, uttering comments with light prods here and there (to which she was to remain silent until after I’d shagged her.). To do one like that you do both need to understand the basics of S&M and also she needs to have a modicum of intelligence (which rules out most of them).