Alternatively, if it's not a typo, "i raf you" could be slang or a username. Maybe they want a text related to that. But given the rest of the phrase, the most plausible scenario is a fan work involving a sister who's a witch. The user might be looking for a short story or a script. They might also be interested in a specific tone—humorous, dark, family drama? Since they didn't specify, I should cover a general idea.