( #nowkiss tbh, these two just need to date already )

Yeah. It's a whole thing with magic curses and shit I don't really understand, but abridged version is: witch put a curse on a guy a thousand years ago, doppelgangers bind the curse. Katherine got out of being used as a human sacrifice by turning into a vampire.

( the amusement drains out of damon slowly, and his voice loses all sense of mirth when he speaks again. )

Elena wasn't so lucky.