I speak Spanish, so if I didn't understand well, it was because of the translator.
And I saw that the characters interact well. But I don't know if Megumin calls Darkness or Kazuma a pervert. She doesn't usually call him a pervert that often. On the other hand, if she says it to Darkness when they're about to leave, it makes sense, since Darkness tried to rape Kazuma more than once when he was in a relationship with Megumin. It makes sense that she would threaten Darkness.