I always love to see spanking content, but honestly, I think that it would be more in-character for Mary Poppins to be the one giving the PC spankings. If there was a Femdom route where you fail to manipulate her or push things too far too quickly and she ends up spanking you and training you, it would not only add to the game, but also feel more like you are performing clever manipulation and corruption in the route in which you dominate her.