Before I say something about the relationship of K & K: I am now in RLC for less than a month, so I was allowed to read from the history of the two only in this forum. But at what I have observed until now I think:
At Kami I think, unfortunately, is much calculation in how it arrives at the spectator. I mean she likes Kami as a best friend, but it will never come to more than cuddling. (And that's in really best female friends nothing unusual, just guys interpret into it more.) The whole "I'm bi and you can look at a happy hot night with me and Kristy "is not real. Unfortunately.
Kristy on the other hand not only plays a role in front of the camera, there's more. Maybe they want it themselves admit not, do not want to jeopardize her friendship with Kami by going on the whole or she knows that it will never come to more. But check it in her eyes when she is with Kami together ... They tried to make the best of it and want as many times as possible with kami, either they can live with it or it breaks it.
Now about Kamis friend I do not know either the relationship is already at the stage where everyone has their own paths goes, but you do not even want to separate yourself or really Kami can not or will not show her feelings for him in front of the cams.
That's my opinion.
Hope you understand what I'm saying, because the google translator is not really a help and in school I'm looking for things other than English.
Taking it to me ultimately also relatively unimportant whether the two only play a role, and we all interpret to much into it. I am watching RLC to be entertained (if i want to see sex i watching a porno) and that's what the two do. And all discussions show to me that's others see it that way.