The author hasn't sued any writer and seems to be supportive of fanfiction. She has given her blessing to all those who write fanfiction based on the characters and says that she is very flattered. She did have issues with particularly explicit content, especially if it wasn't accurately credited to the author because, as she noted, no matter how old the books are, they were designed for children, and it can be a problem if young children who are fans of Harry Potter stumble across explicit, X-rated stories.