We talk poetically about 'a burning passion' for someone. Bovary is wanting Boulanger to feel such a burning passion for her, but of such depth and intensity that it would overwhelm Boulanger - it would burn with such intensity that he would be consumed - and more: such love, such a passion is destructive to the other -'it destroys everything it touches'. and destroy you (Bovary) at the same time.
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