It's been some time... but as far as I remember it isn't said directly and leaves room for interpretation. I think, all it does say is something like "Geralt knew what his last wish would be" or something like that.

Well, if it was a wish for true love between them then why wouldn't it be true love? Just because it had to be started by magic wouldn't necessarily make their feelings any less real once it started would it?

In answer to your question though, as someone whose read the english translation it's not clear, and deliberately so it appears. It never states what it was that Geralt wished for, and while Geralt and Yen talk about what it afterwards its never clear the exact thing it was he wished for. It wasn't for her to not be a hunchback however, as she had already been 'fixed' via magic when she became a sorceress, though Geralt with his perfect vision could see the slight imperfection in the way that she held her shoulders to recognise that she had been a hunchback once. It could perhaps have been something to do with her former disability however, such as being able to see past it since knowing the truth about her seemed to put him off.

What is clear however is that in making the wish he 'tied his fate to hers'. This is stated in the book, and seems to be the defining part of the wish. Counter-magic won't undo this wish or the love generated by it from my understanding, since otherwise someone like Triss would have undone it now otherwise, and isn't so much sustained by magic as rather it was caused by magic but is now fixed, sort of like how if altering your DNA with a retrovirus would result in a change, once the retrovirus has done the job it's no longer needed to maintain the change.

@ Aaden and Flint, thank you for your replies. It has cleared my question.

Slight off-topic, but why is it taking so long to translate those books in english? Don't they sell enough?

I want to read them, dammit!

I wonder if Mr. Sapkowski has any intentions to continue with the saga at some point, or is he totally done with it?

Edit. Hey, a Finnish translation for Sword of Destiny is coming this summer, neat!

Dunno what is holding up the translations, if it is lack of sales then I'll just have to pimp them more to my friends. :D

As to Sapkowski continuing them, I get the impression it isn't likely. It appears to me that he got disillusioned with the series, possibly due to how adaptions of his work via the film and series had failed or hadn't stayed true to his vision or something, that's the impression I got anyway and perhaps his 'killing off' of Geralt was motivated by it, a desire to end it all now sort of thing so that he could move on and not worry about someone else carrying it on. Pure theorycraft on my part based on what little I've managed to find on the matter.

Burn out is understandable. I know he liked the first game.

Oh, bummer. Wonder what he thinks of the games? Maybe they inspire him to go back to the series :)

(wishful thinking, I know..)

I think he helped to write the script to the first game, but he didn't with the second one.

It would be rather hard for him to write sequel, considering the game plot is more or less that, even though it isn't by any means canon. Maybe he could write about what happened before the main events, f.e the first war with Nilfgaard, the invasion of humans or the Falka's revolt.