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So far the most fun thing I've been able to pull off is class change/demotion fetish stuff. Turning Gym Leader Sabrina into Beauty Sabrina was really hot.
In general I think this type of program works pretty well for mind control. That way when you tell the character that they're your servant now for the eighteenth time, it's not you making sure the character doesn't just forget, it's you "mind controlling" them.