Game Of Thrones Season 7 Reactions: What "Dragonstone" Really Means
6. The Lannister/Greyjoy Alliance (And Jaime's Unhappiness)
Though she's initially a little wary of Euron Greyjoy (who has immediately become the great, charming villain the show needed in Ramsay's wake), Cersei has been forced to make her alliance with him with the Greyjoys out of the picture. He's the only leader left who has military resources, and handily, he wants to marry Cersei in return, so he's not asking for too much (we already know her opinion of marriage for power).
The problem here for Cersei is that this decision could well be the decision that puts the nail in the coffin of her relationship with Jaime. He clearly trusts Euron even less than her (and the threat to his masculinity in Euron's goading is delightful), and rightly questions the logic of getting into bed with pirates. It's not like the people will react well.
Maybe we'll see him pull away even further from her now?
For Euron's part, he insisted he'll prove his worth to Cersei by presenting her with a gift so valuable she won't be able to turn him down. And by a gift, he clearly means a person or people. Logic would suggest this would mean Gendry, since he's still the most strategically important figure Cersei could get her hands on, but it's actually more likely Euron will actually go with a more emotional target like Ellaria Sand, presenting her head in revenge for the death of Myrcella.
Oddly, the synopsis of episode 3 - "Cersei returns a gift" - suggests his ploy doesn't work. Unless of course she returns the gift to Dany rather than Euron, symbolically posting bits of Ellaria (and anyone else she gets her hands on) to Dragonstone?