The thing is that her design doesn't scream Kuudere like... at all. She looks more like an Ara Ara type.I think that is point behind here scenes. Now, as you may have noticed,hard I know, Tobs is kind of a weabo. She is part of Kuudere character archetype commonly found in anime and manga (or at least, it used to be). There sex appeal comes in how distant they can be and there never changing expression, so a lot of there sex scenes, involve those qualities. Now I am not sure what appeal of them exactly is, but that is that is a reason why she is written like that.