Triss and Lambert are too antagonistic to be indifferent to each other, so they have some kind of history, but I do not think there is any warrant to believe it a romantic one. Triss and Eskel, on the other hand, are shacked up in the post-canon Something Ends, Something Begins. Must be something to that old witcher touch.
Yeah i don't see a romantic history between Lambert and Triss.
With Eskel there's clearly the potential(and non canon consumation) but no realisation in actual game or book canon.
@GuyNwah and @wright1978 - Speaking from a purely creative writing perspective, I would say that it's precisely the antagonistic nature of the Triss/Lambert relationship that makes such a flight of fancy appealing to me. It doesn't necessarily imply a romance, I agree, but in my honest opinion doesn't preclude it either. From my TW3 experience, Lambert seems like a much better fleshed out character than Eskel, and perhaps because of that I see more potential in him. Lets say for arguments sake that one does try to bring Lambert and Triss together. Like you said, they're not indifferent to eachother. I don't think the problem would come from the young witcher, but from the sorceress. Triss is in no way ready to forget Geralt that easily. She'd rather be alone.
I can't really say much about "Something Ends, Something Begins". I've read it, but like you said, it's post-canon and I have no knowledge of the canon material to say that Triss and Eskel could reasonably end up together either. To imply that Eskel/Triss work better than Lambert/Triss just because the first is mentioned in the author's short story, misses out the "why". I'm not opposed to it mind you, but I don't understand the motivation behind it and Sapkowski doesn't go into a lot of detail there. So for that reason I respectfully disagree with both your opinions. I would say the game is on for both couples if we are really to imagine Triss with someone other than Geralt in a TW3 universe.
Dat witcher touch on the other hand... (Vlodomir, out of my head, now!)