The flea' is a dramatic lyric.In the every first line of lyrics, the poet-lover asks his beloved to observe the feal carefully .However, her gestures and attitudes are brought out by references to them on the part of the lover.The lover is the speaker and the beloved is the silent listener.She should notice that first, it sucked his blood and then hers, and in this way, their blood mingles in it's body, as they do in sexual intercourse.