The ego in this fic would hurt my brain ... besides, they'd have to have a fight to the death to decide which one gets to take all the shots and be on top. And then, with one being decidedly dead, it takes the fic in all sorts of wrong directions. Ok, I think I'll cease that train of thought right now.
Also, I think the LJ/KG pairing would have endless amounts of giggling. It seems to be all they do, any time their eye lines cross each other.