Fandom: STAR WARS - ORIGINAL TRILOGY
Pairing: Han/Leia
Length: Both parts add up to 170 pages in Adobe Reader
Author on LJ: leelastarsky
Author's Website: May the Muse be With You is her official site, but she also has unlocked fic at The Corellian Embassy.
Why this must be read:

Forty Days to Bespin covers the time spent between Han and Leia on the way from Hoth to Bespin during The Empire Strikes Back. They grow closer, consummate their relationship, and begin develop a deeper understanding for each other. For a while, this was one of the definitive H/L stories in the fandom.

Leela's characterization of Leia is the most humanizing I've read. She explores Leia's phobia of becoming close to others, yet still keeps her integrity and heroism. Leela also has in-depth backstories about Han which she uses in many other fics; she writes Han as a caring person without taking the smuggler out of him.

Oh, and the smut is hot. And Leia cuts up Han's bedsheets as home-made sanitary napkins. She's tricky, that one.

Part 1
Part 2

Fandom: DOCTOR WHO
Pairing: Tenth Doctor/Rose Tyler/Jack Harkness & Author-Created!Eleven/Rose/Jack
Length: 85,560 words
Author on LJ: wendymr
Author Website: The Doctor and Me (incomplete);
Account on A Teaspoon and an Open Mind
Why this must be read: Ever read a series that's so bloody fantastic you wish it were canon? Actually, there was that meme going around before Season Four began that asked, if you were in charge of Season Four, what would you have happen? My answer would have been this fic. OK - the beginning would have to have been tweaked a bit to fit in with "Utopia," but, except for that, this would pretty much have been it. (Taking into account, of course, if I "were in charge," things like "actor availability," "budget restraints," and "pre-watershed hour" wouldn't exist.)

I thought wendymr captured Ten so well--including his inability to shut up, even during sex. I liked how she portrayed Jack and Rose, individually, (eventually) as a married couple, and as a part of the OT3 relationship. I thought it was also perfect how the Doctor returned to them after losing another companion. I even admired the details in these stories--like making that lost companion, Lauren, a travel agent: someone who sends other people to wonderful places but never went herself. There's more I want to praise, but I think I may have spoiled too much of the series already!

Honestly, this is my favorite Whoniverse fanfic ever and one of my favorite novel-length fics, in any fandom.

The Judas Series