That's about it. Well, what can I say? The fanfic for this couple is smut-tacular. I don't think I need a better reason... that and Kakashi has white hair. I tend to find somewhat young anime men with white hair pretty darn sexy (Sesshoumaru from Inuyasha, Abel Nightroad (well, he's ancient, but he doesn't look it!) from Trinity Blood, Enishi from RK, Akio from Utena, Natsume Shin from Tenjou Tenge, the list goes on. As you can see this is not a sanity list or a naughty-or-nice list (tho some of these guys are pretty naughty), it's much more of an eye-candy list)... That and he's a pervert which apparently helps make it more smut-tacular.
'Nough said.
Okay, I lied. I like SaiSaku on the side... but only because the boy's so damn awkward and clueless that the story could go from totally comical to totally angst faster than you can blink.