Queen Cersei and Tyrion may have cut a deal with each other in the season finale. They definitely shared a moment that would suggest it. The siblings have not gotten along very well.
Tyrion even thought about killing his sister on more than one occasion. It would be beneficial to both of them if they were to team up. The one thing that could mess up any potential deal is that Cersei may not actually be pregnant. Either they cut a deal with each other or one of them is playing the other for a fool to get what they want.
