In an ominous moment amid Jon and Dany's passion, Tyrion appears to be outside the bedroom, completely crestfallen. There's a chance he's falling in love with the queen. After all, as Cersei points out earlier on in the finale, Dany is just his type. That alone would be enough to cause a rift on the Targaryen side of this war. What if Tyrion's passion drives him back to his sister?
Another theory suggests that Tyrion, believing Daenerys cannot bear children, decides to promise the throne to Cersei's unborn child. Perhaps, in this moment, he's worried she's not barren after all. Maybe his entire plan will fall through.
The last idea is that he's worried about her judgment (as we mentioned above). If Tyrion is Hand of the Queen, he may be worried that Jon Snow will replace him as Dany's adviser. Perhaps he's been forced out of the equation. Regardless of what's going on inside Tyrion's head, it's clear he's expressing disappointment on the outside. This, surely, will lead to some kind of consequence.
