Stannis Baratheon stands up on his boat and looks at the flaming wreckage all around him. He tells his men to prepare to land. His theory is that the wildfire was the defenders' only trick. His nearest soldier tries to talk him out of landing on the grounds that they're too far from the gate and there are all these archers up on the wall. And also all this fire. He asks how many men will die. Stannis shrugs that the death toll will probably be in the thousands. He doesn't seem bothered by this. Then he shouts, "Come with me and take this city!" It's on.
Maegor's Holdfast. There's a juggler. Sansa is praying with a few other girls. Cersei is still drinking and wants to talk to Sansa again. Sansa has to explain that she was praying and Cersei makes fun of her for being so perfect. And what was Sansa praying for? For the gods to take mercy on them. All of them. Even Cersei, apparently. How about Joffrey? Sansa starts her standard speech about how much she loves Joffrey and Cersei tells her to shut up. Then she tells her a story about how she prayed to the gods to bring her mother back and Tywin told her the gods don't have mercy. Tywin believes in the gods, but he doesn't like them. Cersei makes Sansa drink some wine. "I should have been born a man. I'd rather face a thousand swords than be shut up inside with this flock of frightened hens." Sansa points out that Cersei told all the ladies where to go and Cersei explains that it was expected of her. The whole point is that if King's Landing survives, the ladies will go back to their men (or, as Cersei puts it, "the hens will return to their cocks") and talk about how Cersei's bravery inspired them. If the city falls, Cersei plans to go to the wall and personally surrender to Stannis, although she doesn't think she has much of a chance of seducing him. She reminds Sansa that tears aren't a woman's only weapon. "The best one's between your legs. Learn how to use it." I think Cersei is being very helpful, although I can see how Sansa might hate every second of this. But honestly, these are helpful tips for a potential queen.
Cersei asks if Sansa knows what happens when a city is sacked. The answer includes the phrase "a bit of a rape." And Sansa is now lucky to have her "red flower" because it means less chance of a bastard. Cersei's fun when she's drunk!