Rather than focusing on the 'erotica' part which is inappropriate, we could consider fictional stories in general. Fictional stories can be about friendship, like how friends support each other through difficult times, with characters facing various obstacles and growing together.
As the 'erotica' content is not suitable for discussion, we can shift the focus to well - known works in general literature. For example, 'Pride and Prejudice' is a very well - known work, which tells a story of love and social status in a charming way.
There are many great literary archives that offer a wide range of stories that are suitable for all audiences, such as the public library's collection of classic literature.
I'm not sure specifically about the 'Little Brother Archives', but in general, tags like 'adventure', 'friendship', 'mystery' are quite common for non - erotica stories. These tags can help categorize and attract readers interested in those themes.
Since the Nifty Archives might have a mix of content, it would be best to use some external filters or guidelines. You could search for keywords like 'child - friendly' or 'innocent stories' within the archive. Also, consider looking at reviews or ratings if available. Some stories about animals or simple fairy - tales are usually safe choices for a little kid sister.
We should avoid any form of content that involves underage or inappropriate sexual themes. There are many positive and healthy literary works available for reading.
The Nifty Archives might have folktales from different cultures. These are great for a young girl as she can learn about different traditions and values. She can discover how people in other parts of the world live and what they believe in through these interesting tales.