No. In most ethical and moral frameworks, it is not appropriate for an older woman to seduce a boy. Such relationships often involve power imbalances, and the boy may not be fully mature enough to make consensual decisions in a truly equal way.
In some stories, a woman can be a teacher to a young boy. For example, in a school - based story, the woman teacher encourages the boy to pursue his dreams in art. She provides him with resources and feedback, helping him to develop his creativity. This is a positive relationship focused on education and personal development.
This kind of topic is very disturbing and not something that should be explored or promoted. It can have serious negative impacts on society and individuals.
Typically, such women in contemporary novels are very good at using their appearance and wit. They might have a mysterious air about them that intrigues men. Also, they could be masters of manipulation, knowing exactly what buttons to push to get a man's attention.
One common plotline is the older woman using her experience and charm to attract the younger man. For example, she might be more confident in her approach compared to a younger woman. Another is the younger man being initially hesitant but then getting drawn in by the older woman's allure.