Mephisto's daughter

The demon king was sitting at his office desk, signing documents and papers he had neglected and put off until the last minute. It was silent in his True Cross office, until the was a knock on the large wooden door. He looked up from his boring papers. He set his pen down and pushed the paper away and said in his usual calm and polite tone "Come in."

Hi, for the longest I've thought about this and there aren't that many out there. I did add my own characters in here so if you don't like that then this isn't your kind of book. So this is not a reader-insert.
All of this is a book for fun and not for accuracy or follows the anime/manga. With that said I hope you like my book!