It's hard to say exactly when friendship turns deadly in a true story. It could happen due to various circumstances and events that build up over time.
In the Game of Thrones novels, Tyrion Lannister remains alive. His character undergoes many challenges and developments but doesn't meet his end. The author has kept him as an important part of the ongoing narrative.
It's hard to say exactly. The circumstances and timing of when love becomes a destructive force in this story could vary depending on the plot's development and character interactions.
At first, their interaction would likely be very guarded. Sansa would be cautious as she has learned to be in a world full of danger. Tywin would probably see her as a young, naive girl but also a valuable asset. As time goes on, Sansa might start to challenge Tywin's ideas, which could lead to some intense exchanges between them.
Arya and Tywin could also interact in a more unexpected way. Maybe in a situation where they are forced to work together for a short time due to some external threat. During this time, Arya has to constantly remind herself of her ultimate goal of revenge while Tywin is constantly on guard against her, yet also seeing potential in her skills for his own purposes.
There are many fanfics out there, but it's a matter of personal taste. Some might find 'A Different Path' by [author name] to be an interesting take on a Sansa Tyrion story where pregnancy could potentially be a plot point. It delves into their complex relationship and how such a situation might change their dynamics within the world of the story.
Tyrion starts as a misfit in his family, constantly underestimated and ridiculed. But as the story progresses, he becomes more and more resilient. He learns to use his intelligence to survive in the cruel world of Westeros. For example, during his time as Hand of the King, he starts to understand the true nature of power and politics.