Klaus gave a devilish grin at Elena's answer. At her offer to dance, he downed the rest of his drink. "Why not." He answered, before standing and extending his hand to her.
Klaus knew that Elena's friends would do what they could to convince her to turn her humanity back on. They would not want her to live like this forever. It was not in Elena's personality. He'd even help try to convince her to to turn her humanity back on. However, Klaus knew how freeing it was to not care about what other people thought and to do what ever it was that you wanted to do.
He led her over to the dance floor. "What brought you out this evening, Elena? Are we celebrating something?"