Yes, it is very common now, to await from Nanny outstanding sexual actions.
But when we look back to the previous HA-games, the basic property of Nanny everytimes was her authority. Even in the scenes of HA3 there is a heavyweighted point, one end of three, where Nanny virgorously cut the sexual activities. Each time, when Nanny goes sexual, she by herself was not the beginning part. What do we have until now? Some boobs-play, a massage and the fuching scene with Frank (This was the classic:...NO!.....DONT!.....STOP!.....DONT STOP!!!!!). If in future the role of Nanny woüld be changed too much into a slutty one, we would cease to have so much fun with her. Sexually oriented sluts we do have enough in the gaming scene.
As conclusion: We should admire Shark for his sensible way to hold Nanny on the small borderline between her authority and her sexual excursions!