Rating: All Ages
Word Count: 2,628
Author's Summary: The word you're looking for is "ontological paradox."
Characters/Pairings: Seven, Ace
Recced because: If you've read the Heinlein story "All You Zombies," you know exactly where Biichan's take on it is going from the start ... but that won't hinder your enjoyment of it, not one bit. Re-casting this classic time paradox story with Seven and Ace works perfectly, and allows Seven to manipulate his companion as never before. It's exactly the sort of mind-bending twistiness a time-travel series should be getting up to, and probably would be if Doctor Who weren't considered a family show.