I want to read some DP fanfiction.  But I want the Undocumented Features,
TV series Kei and Yuri, not the Adam Warren "Gee, I didn't know my arms
could bend that way" girls.  Any suggestions?

Actually, I'd suggest trying everything in the archives. There isn't all 
that much (cf. this mailing list), and none of it is Adam Warrenish. I 
think there are one or two short dark ones, with clear warnings in the 
introductions. On the other hand, I can't stand UF...