Fiction and nonfiction are not so easily divided. Fiction may not be real, but it's true; it goes beyond the garland of facts to get to emotional and psychological truths. As for nonfiction, for history, it may be real, but its truth is slippery, hard to access, with no fixed meaning bolted to it. If history doesn't become story, it dies to everyone except the historian.
Preserve your conscience always soft and sensitive. If but one sin force its way into that tender part of the soul and dwell there, the road is paved for a thousand iniquities.