Gray Knight series
Irresistible Force : Immovable Object
Ghost Ship
It’s The Little Things
The Story of Chess
My Partner : My Lover - Adult
Shattered
A Snowball in Meifu
Characters/Pairings: Watari/Tatsumi
Warnings: Except for the one graphic sex one, none that I can think of. Maybe a little graphic violence, mature themes.
Summary: Gray Knight is the code given to assignments with extenuating circumstances. The cases that tear emotionally at whoever is assigned them. When Tatsumi takes one such case to spare Tsuzuki and Hisoka another heartrending case, Watari assigns himself as his partner. This is the story of that case, and the relationship that develops after that.
Comments: Hey, a not quite as half-assed a summary as I usually do. Still a little melodramatic and inane, but you can’t have everything. Anyway, this is flat out the single best Tatsumi/Watari series on the Internet, as well as one of my favorite YnM fics period. It takes the time to develop their relationship properly, and both Watari and Tatsumi’s characterization are well done. And there’s actual plot!
Multi-chaptered fics and one-shot fics, all complete. However, the series itself is permanently incomplete with, alas, a few unresolved issues from Shattered left unresolved. Please allow me a few seconds of complaining that the one fic that left open threads is also the one that is the last one that the author wrote.