For me it was Yennefer all they way. As soon as I heard that sultry voice, there wasn't any lingering doubt in my mind
. I only read the Witcher books that have been translated to English recently after my Wicher 2 playthrough in anticipation of W3, but have to say that having learned the backstory about Yen and Geralt and getting to know more about Yennefer through the books really helped to overlook the initial, rather cold, reception that Geralt reeceives from Yennefer in Vizima.
During gameplay I guess I got so caught up in the role of Geralt, thanks to the much more personal story than Witcher 2, that I never looked Ciri that way, but now after finishing the game and having gotten over my initial post game depression (CDPR really dropped the ball dumping Geralt all alone in Kaer Morhen after the epilogue) , I have to admit that I could easily see myself falling for a girl like that in real world. Those eyes and that personality...