Disclaimer: It's all JKR's.
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It is not her first memory; rather, it is her first memory of him. As a five year old, she is filled with annoyance at being ignored for longer than an hour. Her mother and sisters are rushing, rushing, rushing, and much too busy for her, and Narcissa hardly ever interacts with Cygnus if she can help it. Even as a child, she can recognize the perpetually angry aura that hangs around him like a heavy curtain and reflects his true moods. Too often, she has seen Bella or Andy, or even her mother Druella, colored with black and blue, and she is sharp enough to know from where it comes even at her young age. For this reason, she avoids her father. Her appearance is far too precious to her, and she would never let anything mar it. Already, she is living up to the mythology behind her name.
That day, after meticulously combing her hair, which she lets no one else touch, she flounces downstairs, eager to find someone who would bestow attention upon her. Disappointed at the rush and bustle around the house, which took attention away from her, Narcissa finds her way to the garden. She carefully peels off her stockings and makes sure her dress is tucked away before slipping her small feet into the clear pond. She giggles as the water trickles over and tickles her feet. Suddenly, a sharp noise draws her eyes to the far side of the garden. A boy with hair as blond as hers and a haughty expression on his face approaches her. He looks to be about her age, maybe a year or two older.
"I'm Lucius," says the boy, holding out his hand before launching into a rude yet truthful comment, as children often do. "Why do you point your nose in the air that way? You look as though you've smelled something foul."
Narcissa gasps at being addressed so rudely. She lifts her perfect nose in the air and slaps his offending hand away. "I'm Narcissa, and you should probably leave. That's quite rude."
"I can't. We're your guests. And besides, you and I are going to be married."
Again, she gasps. Unable to tolerate this insolent, lying boy any longer, she steps out of the pond and goes inside as quickly but elegantly as she can, dripping water all the way. It is the first time she has met him, but also the first time she dreams of marriage. Not to him, of course.