"And so in memory of the children lost to the Silence, the traitor is delivered to the arms of those she betrayed." They toss Isabella in the canal and she gets raped/eaten. Rosanna leads the Veelas and Frenchy down to the water, and he reminds her that she better turn off her fannypack or else her sons will rape/eat her, or something. They share a sweet incesty moment, and then she heads inside, where the Doctor is sitting in her ridiculous gold throne. He has figured a bunch of stuff out.
"Long way from Saturnyne, aren't you? Sister of the Water?" She mentions the refugee thing again, and they do this beautiful courtly "question for a question" thing that is all about the acting. The stuff they actually talk about is science fictiony factoids about their race of raping fish people -- how does the fannypack illusion machine work, what are vampires really all about -- stuff you probably care about but I forget it while they're saying it, because it's all pretend anyway. Like, I love in theory the idea of a book all about the Enterprise D and where the bathrooms are, but you look at a blueprint or two and then it's like, "What am I even doing right now?"
When he tells her he's of Gallifrey, she cuts him to the quick: "You should be in a museum! Or in a mausoleum." Well, not really to the quick, because they're almost friends at this point. They ran from the Silence, is why they're in Venice 1580. Why is he? "Wedding present." His response question is about the Silence, which she actually delves into a little: "There were Cracks. Some were tiny, some were as big as the sky. Through some we saw worlds, and people, and through others we saw Silence, and the end of all things. We fled to an ocean like ours, and the Crack snapped shut behind us, and Saturnyne was lost." Rosanna, by the way, has a beautiful laugh. He really likes her, I think as much as I do. Such a grace note on what could have been a forgettable episode.
So Earth is the colony, like almost every episode seems like, and she immediately asks the Doctor if he wants to build a new society with her. His response question: "Where's Isabella?" She doesn't recognize the name, but ponies up when he reminds her who that is, by explaining that she threw Isabella in the canal, where she got raped and eaten. The way she describes it, you can kind of respect why she did it. Then she asks the Doctor to be her husband, essentially, and he nearly laughs. "I'm a Time Lord, you're a big fish. Think of the children!" True. She's a total MILF, but in reality that is a lie. Big fish.