ok so consider: a dominatrix who, instead of the usual black leather and terror setup, presents as a cute little magical girl in a lolita fashion-inspired costume. you get to be the monster of the week.
a do-moé-natrix, if you will.
alternatively, you pose as someone transformed into a monster by the big bad; this allows you to fold the aftercare into the fiction, as the heroine tells you how worried she was about you, and about how happy she is to have you back.
there could even be a dominatrix who does a variation on this setup involving boxing gloves and grappling. a precure-style do-moé-natrix. a do-maki-itoh-natrix.