Word Count: 15,594
Author's Summary: LotTL AU. The Master doesn't die. The Doctor 'keeps' him. Trapped in the TARDIS together they have nowhere to run, and the Doctor slowly goes mad. The Master already is.
Characters/Pairings: Jack Harkness, Tenth Doctor, Master (Simm)
Warnings: Explicit Sex, Explicit Violence, Non-Con
Recced because: It's absolutely devastating. Out of all of the wave of fics that could have had "The Master doesn't die. The Doctor 'keeps' him" as their summary, this is my favourite. It is dark, twisted, and kind of horrific. But it's an incredibly powerful piece of fic, from the first to last line.
Rec: Hourglass, by Schildkroet