Damon returned to Mystic Falls with the intent of bringing back Katherine, but instead he found Elena, the same beauty with all of the good qualities he sought in love. Their chemistry is smoking hot and they forgive each other above all else. Damon has humanity and Elena feels free when they're together. That's magical.
Oooh, you know I don't know. Every time we try and go on a date you get kidnapped, I get sent to a prison world, or your feelings get compelled away...