Katherine: "A little birdie told me you've been a bad girl ... Really, you've been with Klaus?"
Elena: "Stop it! How do you know ... ?"
Katherine: "I saw Stefan. He told me. Poor boy ... "
Elena: "Shut up!"
Katherine: "Take a seat. I'd like us to have a little chat ... Huh, you don't look very happy. Let me guess: Your conscience, you feel bad, you're telling yourself you don't wanna do IT with him and blah blah blah ... Am I wrong?" Elena's silent. "Huh, I knew it! ... But you know that you're a vampire now, don't you? So you can turn it all off." Elena keeps quiet. "O c'mon, sweetheart ... Just do it! Damon and Stefan left town. Your friends abandoned you ... It's pretty easy. Just turn it all off ... You won't have to feel guilty about all the dirty thoughts you have about Klaus ..."