Serena and Sage in Close Quarters in Season 6 Episode 3 "Dirty Rotten Scandals"
Oh, Sage. Sage, Sage, Sage. We can’t wait to find out what trouble you're stirring up. It's gotta be something big to make Serena make that face at you. Is she still mad about the chain purse? And where are you? Something about the drawn curtains and casual pose makes us think you engineered this meeting. But why?