Kitty > Rebecca
Rebecca has the makings for a best friend, but Kitty isn't quite there with her yet. Part of it might be the Tyki and Cross situation. Some of it might be just that Kitty has been spending so much time on the DF and with Reid that they just haven't hung out as much as they could have under other circumstances. Still, she really likes Rebecca. Shared lifestyle to some extent, fun, smart, also a tech person, interesting. And if things had just gone a little differently that night she might have found out what kind of kisser she is too and probably without hesitation. Not that it would have likely led to anything more. (They'll have to find out during the mistletoe bots now.)
She likes that she and Reid have a mutual friend in Rebecca. She liked the three of them hanging out and they haven't really done that since she and Reid became a thing. So, more threesomes!