Harper plays with fire all season, inserting herself into Daphne and Cameron's weird relationship dynamic. In episode six, Ethan is obsessed that she might have slept with Cameron. Viewers never really get confirmation if it did happen or not (Harper insists they only kissed), and we also don't know for sure if Ethan sleeps with Daphne in revenge. But Harper and Ethan do finally have sex again before leaving Sicily.