I finished my Buffy/Lost crossover fanficiton story today. :) It has seven chapters total.
Title: One Year Away from 30: Oz and Willow Reunite in San Francisco
Fandom: Buffy the Vampire Slayer and LOST
Characters: Oz/Willow (primary), Willow/Ana Lucia (secondary), Claire/Charlie (secondary), Oz/Claire (secondary)
Summary: What would happen if Oz and Willow reunited in San Francisco, California, eleven years after the destruction of the initial Sunnydale High School, when both of them are soon to turn 30? As an added twist, Willow just got out of a relationship with Ana Lucia from LOST, and Oz had a fling with Claire. Will they make their way back to each other? Is your first love ever the right one?
Link to Chapter 7: https://www.fanfiction.net/s/11991969/7/One-Year-Away-From-Thirty-Oz-and-Willow-Reunite-in-SF