The Pirates of the North

Oren waters is the brother of Montfort, probably engaged in piracy on the steps and says a real pirate fleet. He could theoretically overwhelm Driftmark with what he has because what little strength they have is north with Stannis. Oren's like, I hire these guys because I knew they'd be cool with us. Well, stealing the ships and running off to become pirates. That could be one route that we could really see happen. Or maybe just look at him romantically, which might make her even more likely to fall for him. The things you do when you encounter each other are set up in the stepstones.