*sigh* It's the hot, southerly place for me, I suppose. Not like that's anything new. I've always been into certain unconventional pairings. Spander (btvs), Snarry* (Harry Potter), Demando/Usagi (Sailor Moon... way Back In The Day), Padme/Vader...
Still, I think it was all the soulful gazing at Simon on Mal's part while offering him a position as ship's doctor. That and the constant, only-half-carried-out threats of violence. In the Joss-verse, that's like second base. ^_~
*actually, if I'm going to hell for any of these, it's probably this one. ^^;