Who and how acted on the line of quests from Keira? (The Witcher 3: Wild Hunt)

There will be spoilers ahead for you. Unless, of course, you have gone through this questline.
In general, I slept with her, in a conversation at the table I answered that I did not burn anything. Of course, I understood what it would come to. (Especially after the phrases, they say there are some dangerous things there)

And there you could choose not to sleep with her, but I'm not quite sure if you really could refuse? Or everything would come to one. And was it possible to lie, they say everything was burned there. As a result, after sex, she put me to sleep. I came to the tower, answered rudely, they say, a two-faced snake, but there was another answer. In short, in the end it came to a fight and I killed her. How quickly it all ended, and even a shame. Still, she helped me. And after the words of Geralt, they say everything could be different, I wondered, how could it be otherwise?
Someone went through these quests with different answers, what did you have? Interesting!

More specifically, I'm interested in the variability of this quest.