Hermione and Harry are acting a bit out of character in these last few chapters. Canon Hermione is straightforward, sometimes even abrasive, and extremely concerned with fairness. That is why she started S.P.E.W., after all. I can understand making her more social and diplomatic in order to strengthen her above canon, but the preoccupation with fairness and justice is pretty central to her personality. Is she toying with Harry (which isn't like her), or are they both blind to how silly he's being?

This apology business doesn't strike me as cute, like Ch. 36 was. It's just strange.