I agree that it varies a lot by erotica subgenre and reader taste. But maybe it will help if I describe the dynamics of a few seduction scenes, the motives and scene structure might be convertible from one subgenre to another.
Character A the seducer: Character A wants character B. They have in a previous scene thought about their appreciation for B's body. A should also have admired something non-physical about B - B might be a champion at some sport, or an artist, or unusually honest, or unusually kind, or great with kids, or helped A out, etc. A should also have felt sympathy for B due to some suffering on B's part - perhaps a third character verbally abused B, or B was injured, or worked themself ragged to accomplish a goal they cared about, or can't spend money on fun things because it all goes to a relative's medical bills, etc.
Once those three things have been done to establish A's desire for B as something deep, then A has to decide what to do about it. Seduction is only one option, so if you want seduction specifically then it has to be appropriate to the situation and the two characters' personalities. For example, if A was a social butterfly who was not assertive, A would probably not attempt seduction but instead either tell a friend they liked B (expecting for the message to be carried to B) or ask one of B's friends if they thought B might be interested in them.
If A is someone who is confident in their mind or wealth/power but not their body, they are not going to try for a physical seduction, but will instead write love letters or offer gifts and favors. If A is timid they may play secret admirer, while if A is aggressive they will present gifts in person or with signed cards, and probably go for ostentatious gifts like a flood of roses or a sports car. Vice-versa, if A is confident in their body but not their mind or personality, they may be afraid to express their desire verbally and instead will do something like posing in a skimpy swimsuit or arranging for B to 'accidentally' see them underdressed. If A has experience with sex but has never really been loved, they will again take a physical approach, probably with a lot of touching involved, and maybe some verbal innuendos or a flat-out invitation to sex, they will only shy away from saying anything that actually reveals their emotions.
In a subgenere where dominance and submission are an issue, the act of seduction will generally be aligned with whichever of these A is offering B. If A is dominant, A might express jealousy of B spending time with 'rivals' and express possessiveness of B, authority over B, or protectiveness of B, depending on the flavor of the d/s dynamic. If A is submissive A is likely to offer help, gifts, compliments (especially trying to get others to agree that B is great), and A may be self-sacrificing to help B's goals or if an enemy tests A's loyalty to B. (The major exception to this is if A is submissive but trying to act dominant because they think B will like that better, or if A is dominant but trying to act submissive ditto ditto. Typically this attempt to present a false face should fail in an endearing way that reveals that B really prefers A's true self.)