Final answer:
The excerpts provided do not contain direct similes describing a couple in 'Harrison Bergeron'. Instead, they offer rich metaphorical and descriptive language to explain characters' emotions and relationships.
Step-by-step explanation:
The text does not provide a direct simile used by the narrator to describe a couple in "Harrison Bergeron." A simile is a figure of speech that compares two different things using the words 'like' or 'as.' However, vivid descriptions and comparisons are used throughout the provided excerpts to showcase characters' feelings and relationships. For example, there's a reflection of deep connection and longing in the part where two characters think of one another in their "second childhood." These passages focus more on metaphor and imagery to evoke a sense of intimacy and emotion rather than direct similes comparing the couple to something else.