The bicker a lot, but basically once she does they don't have a very romantic relationship. They mostly bicker, but big bro resumes helping out because the idiot five are awful, terrible excuses of waste who well, you'll see.
There is a short story that has them get together romantically, I hesitate to call it incest if only because they are at that point two separate genetic lines, and has bad ends for Olivia and Ange.