Yennefer talks about removing some magic between Geralt and herself by taming a djinn and telling it to remove the magic. What does she mean ? (never played any other witcher games)
Spoilers for "the Last Wish" (basically a full recap) below:
The story "The Last Wish" is about Geralt and Dandelion accidentally releasing a djinn. Danelion thinks it's going to grant his wishes, but Geralt thinks it's going to attack them. He tries to banish it using an incantation he heard but doesn't understand. The djinn roars and flies away. Geralt goes to the nearby city where Yennifer is staying, to seek her advice.
In that first meeting, he starts falling for her, while she is simply curious about him as a witcher. Hearing his story about the djinn, she plots to capture it, as it is immensely powerful and could be used to fuel her magic. She knows it will come back for Geralt and Dandelion, so she has them imprisoned to lure it back.
Geralt is talking to the guard and expresses an offhand "wish you would burst", and the guard actually does burst. This allows Geralt to escape, and makes him realize the djinn actually was granting his wishes. He has one left, and goes to stop Yennifer from trying to capture the djinn.
He finds her struggling with it, and we don't know if she has enough power to win or if it will break free and kill her. She tells him to make his third and last wish, which will free the djinn from him and allow her to trap it. He fears that she is too weakened by the struggle and will be killed if he frees the djinn. He comes up with an idea for that last wish that will also save her life, and makes it.
It works. The story does not allow us to hear the actual wish itself, but another character speculates about "tie his fate to hers", and Yennifer hears it and comments about "you've condemned yourself to me". Presumably it was something like love or binding them together. This begins their... let's call it "tumultuous" relationship which continues in the following stories.
In a humorous touch we learn that the "incantation" Geralt attempted initially translates roughly to "get out of here and go f-ck yourself". This was his first wish to the djinn and explains why it was so angry.
In the story "The Last Wish", by Andrzej Sapkowski (author of The Witcher books), a djinn is released.
At the end of the story, Geralt makes a wish that isn't fully explained in the book, but seems to result in his ongoing relationship with Yennefer.
It seems likely that this is what she is referencing (as in the comment on your question).
I've read the book. In one of the first novels (before the 5-book saga), they run into djinn, and after some troubles they are left with last wish of three, and due to the dangerous cirumstances Geralt is forced to come up with a wish, so djinn will disappear. He was already falling for Yen, but she was cold, so he states he their destinies to be bound, after which djinn disappears, they are safe, and Yen (hearing the wish) is already intrigued. Their story continues from there.
Hope that helped :)
Apparently she no longer wants to be "artificially" connected with Geralt ;)
I actually have a very solid idea of what Geralt's 'last wish' was.
It was, essentially, Ciri.
By wishing to have a child together, Geralt ensures the Djinn cannot harm them, as they both have to live in order for this wish to be carried out.
This also correlates with Yen's words "you've condemned yourself to me" and Dandelions "their fates tied together". The Djinn is also described as being very ticky to control, and wishes that arent explicit backfiring, or not working the way they were expected to.
This also correctly makes Ciri the child surprise. She wasnt just the child surprise for Duny, but also Geralt and Yen Also, before Geralt re-finds Ciri after Cintra is destroyed, he rejected her, but she was his 'destiny'.
Both Yen and Geralt also attempt to have a child together, but are unable to because they are both infertile. Despite this, the Djinn does grant their wish.
It also explains why Geralt and Yen 'break up'. They are unable to concieve, and get frustrated with each other, and also why they 'make up' when Ciri runs off to find Geralt.
Makes better sense than 'to love each other'. Although they do that in their own ways.
ANyway, just my opinion, since its not written and we'll never really know.
No. Ciri wasn't alive, Geralt knew he was promised a child under the law of surprise for the purpose of becoming a witcher. It had nothing to do with Ciri or the desire to have a child. Both Geralt and Yen know they are infertile.
They 'break up' when Geralt loses his memory and sleeps with Triss, who, I might add, used his amnesia to her advantage, because she wanted him. During this quest, if you have chosen Yen instead of Triss obviously, they actually consummate their real love for one another by breaking the last wish imposed by the djinn, and find that they do really love each other.
Of course, nothing in the game is actually canonical, so in that sense you're right that we'll never know.