I can see pretty much anybody as slash material; I start from the assumption that unless specifically noted otherwise, a character's sexuality isn't fixed. And if the source does specify, and I can figure out a way for it to make sense (Alistair defaults to straight, but he'd totally fall for the right guy) then I'll slash them, too.

I could easily see Varel/Nathaniel, but it would almost certainly go to the Daddy/boy place.