1. A short work of fiction, usually in less than 1000 words.
2. A meaningful, emotional, or amusing glimpse into another universe, often focused on a couple that is not real, but could be, if you look from the right perspective.
3. The chemical reaction that occurs when a prompt is combined with a pairing, just under an hour of time, and a burst of inspiration from the author.
(or, a collection of 5h drabbles, based off of a wide array of in-band pairings, likely originally posted by the author on tumblr in response to prompts from anonymous askers.)