Author has written 18 stories for Harry Potter.
Shortly after OoTP, I set out to write a short fic about Harry including Slytherins in the DA in sixth year. Theodore Nott's name came up as a Slytherin who was mysterious enough to be a plausible candidate for membership. However, he insisted on bringing some Hufflepuff called Anne Fairleigh who I'd never heard of. From this grew an entire universe surrounding Theodore, Anne, their families and their lives. The moral is: do not let imaginary characters take up residence in your head, because they will take over your lives.
About the stories: Unity, See You There, and I Will are all one-shots about Theodore, and others, joining the DA. Please note that these were written early on and are now inconsistent with the main series. I Will belongs to my friend Mira.
The best starting point is the story Distractions, which chronicles Theodore's fifth year (Anne's fourth.) Discussions, Discoveries, Distinctions, Disadvantages, and Disavowals continue on to the end of Theodore's seventh year at Hogwarts in that order. Inevitability and A Risk Worth Taking are one-shots set a few years after Theodore and Anne's time at Hogwarts; they are in that order, time-wise, but are consistent in and of themselves, as long as you've read the main series. Going Home is a Christmas story set primarily the Christmas after Disavowals, and Degrees of Separation is a story about Theodore and Anne's daughter, falling after A Risk Worth Taking. Almost all of thse stories were written pre-HBP, and are not consistent with the series of events in that book; however, they are fairly consistent in terms of characterisation.
The only fully canon-compliant story is Dispatches, which follows Theo and Anne through the year of Deathly Hallows; it is essentially AU from the other stories following Discussions but does assume some knowledge of the three stories between Discussions and Disavowals, at the least.
Today is a Gift, Mira's other story, is set, time-wise, between Disavowals and Inevitability, but is only one chapter and looks unlikely to be finished.
The Being Slytherin ficlets are musings from several different characters on what it means to be a Slytherin; to be frank, I wouldn't recommend them. Far too much angst.
I've just posted a post-Disavowals story, Family Games, which is inspired by a short conversation Theodore and Anne's brother decided to have in Going Home (see my earlier note re: imaginary characters.)
I and Mira can be found on Livejournal as sixth_light and labellementeuse; most of these stories are also archived on the Professors' Bookshelf, in betaed form. Come say hi, if you're so inclined; I always enjoy chatting to people.
NB on the probability of updates: I still get the odd review asking about updates, and the reality is that I started writing these stories over a decade ago. I haven't been active in the fandom for some time now. Since I started, I've acquired two university degrees, a spouse, a cat, and a career; all of these things make it exceedingly unlikely I'm going to write any more Theo and Anne stories, even though some of it's unfinished. I'm not saying never ever ever, because you never know...but I'd be surprised myself.