Although it might be the most common use of the word and what we have been talking about with regards to Eliza, to seduce has a wider definition than “to persuade or induce to have sexual intercourse” (dictionary.com). It is also “To lead away from duty, accepted principles, or proper conduct” and “To entice or beguile into a desired state or position” and “To win over; attract” (dictionary.com) all of which apply very much to Willoughby’s relationship with Marianne. Marianne’s conduct was influenced by Willoughby. It can be seen in her harsher treatment of Brandon in chapters 10 and 13 and in going to Allenham Court (IMO) although she knew it was improper. He certainly courted her until she was very much in love, which appears to be the state he wished her to be in although it now seems he had no honorable intent to justify his behavior. I think “When he was present, she had no eyes for any one else. Everything he did was right. Everything he said was clever.” (Ch. 11) illustrates Marianne was beguiled by Willoughby. It is clear from their first meeting (Ch. 10) Willoughby wanted to win over and attract Marianne. He even won some approval by lying about his tastes and opinions and of course he had her entire approval very quickly. Although his goals might have been different towards each girl I think it can be said Willoughby seduced both Eliza and Marianne. (:D)