Sharing such stories is not appropriate as it involves very private and often inappropriate sexual content. Such topics should be kept within the boundaries of a consensual and private relationship.
I don't recommend seeking such inappropriate and unethical content. It's important to focus on positive and respectful forms of learning and interaction.
You could try reading books like 'The Alchemist' which is a beautiful story about following one's dreams. It has no inappropriate content and is full of inspiration.
Sharing such stories is a very personal choice. In a private and consensual setting among adults, some might feel it's okay to share as a form of intimacy. However, in a public or general social context, it is often considered inappropriate as it involves very private sexual matters.
One negative impact is that it can be very offensive to fans who enjoy the original Harry Potter for its family - friendly and positive themes. It also gives a bad name to the fan - fiction community as a whole. People might start to view all fan fiction as inappropriate if this kind of content is associated with it.
Rather than exploring stories with such adult and unethical themes, it is better to turn to classic literature that promotes positive values like love, friendship and self - growth.