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After seeing this scene, I suspect Harry Lloyd could be in danger of stealing a few scenes on Essos if his performance is going to be like that throughout. Just the right note of arrogant delusion, harkening to the portrayals of some of the madder Roman emperors, for example. It also happens to be a line straight from the books. The action, however, is not: in the novel, Viserys is fondling and pinching his sister in a very possessive, objectifying way.
Are they stepping back a bit on the incestuous aspects of Targaryen brother-sister relations?