Have you people ever read Calvin and Hobbes? There`s a girl at Calvin`s age, Susie, who he constantly mocks and teases, but the writer of the series himself has said that Calvin is a little smitten by her. And yet, when Hobbes teases Calvin about Susie and says he`s in love with her, Calvin gets furious.
I specifically remember one series of stripes where I think they looked at Calvin`s horoscope and they found out that Calvin would be lucky with the ladies that week. Calvin got so scared he almost cried and tried to escape school.
But still the writer tries to give us the intention that Calvin likes her, he probably knows how children react to these feelings. So I don`t think Simba and Nala going "Ewww" proves that they were nothing but friends.