Well, generally, it might involve a story where the main character has the intention to seduce the northern duke. Maybe there are various obstacles and intrigues in the process, like dealing with social status differences, family rivalries or political schemes. However, without actually reading the novel, it's hard to be very specific about the exact plot.
Well, surely the main character is the one who has the intention to seduce the northern duke. And of course, the northern duke himself is a main character. There might also be some side characters like the protagonist's friends or family members who could either support or oppose the seduction plan.
In most cases, it's not right. A straight girl may be very uncomfortable with such advances as she is attracted to the opposite sex. It's important to respect the fact that people are different in their sexual preferences and not try to force or manipulate someone into a relationship that is not in line with their natural inclination. For example, if a straight girl is in a situation where she is constantly being pressured by a lesbian's seductive behavior, it can cause her a great deal of distress and confusion.
Be patient. Rushing things will only make her more reluctant. Try to understand her needs and interests. For example, if she loves books, plan a date at a local bookstore or a library event.
Seducing a lady in fanfiction often involves creating a charming and mysterious persona for your character. Add in some thoughtful gestures and a slow build-up of tension to keep the readers engaged.
To seduce a vampire in manga, you could try being mysterious and alluring. Maybe have a unique style or personality that catches their attention. Also, showing bravery in the face of danger could make you stand out to them.
To seduce a lady in a fanfic, focus on building a connection. Make the interaction meaningful, show vulnerability at times, and create moments of shared laughter or adventure. Also, pay attention to the little details about her that make her unique.
You could write her a song or a poem. Express your love and feelings for her in a creative way. It doesn't have to be a professional - level piece, but the fact that it comes from your heart will be very appealing to her.