Damon didn't expect Elena to believe him. Who would believe him when he said he was a vampire? Vampires only existed in stories and movies. But in a few seconds, Elena would believe him. All she needed was a little proof.
"I know this isn't funny, Elena. I don't joke about being what I am. But I promised you proof, so here it is." Damon's eyes were still trained on her and he let his vampire traits appear. The lines appeared under his eyes and he gave her a grin, showing his fangs.