Women may prefer to see Stefan's face, but he goes with a mask in this scene from "Masquerade." He's attending a ball.
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That's not Elena with Stefan. It's Katherine, as she accompanies her old crush to a masquerade ball.
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The Vampire Diaries Season 2 Episode 7 Quotes

You aren't gonna kill Katherine... I am.

Stefan

Tell Damon and Stefan to give me the moonstone or I will rip this town apart until it rains blood.

Katherine