i just love how they wrote the kiss as elena just giving into her urges, her desires, and just going for it. she was acting completely on her emotions, instead of doing the classic elena overthink and denial. it was pure passion. and (i think this might be unpopular), but i loved how it completely contrasted with her scene with damon later at scary mary's. it really showed how much elena heart wants damon, but her brain tells her that she shouldn't want him.
Damon does that to her. He brings out this side of her that she never knew existed. As Rose said, he challenges her. That’s why he went after when she left. He was forcing her to feel what she was feeling. And for once she didn’t run. Well… she did. Towards him.
*CUE PASSIONATE WALLSEX WITH CLOTHES ON*
When she was in the moment, lost in him, she didn’t question anything. When she let herself she found herself pulling away. I think this is mainly because she doesn’t want to let Damon in when she hasn’t fully said goodbye to Stefan. Plus, she is still completely confused. She’s looking at two different paths her life could take. The safe and “good” road with Stefan or the unknown with Damon where it could either be the best or worst experience of her life.
Thankfully, it looks like she’ll be choosing a side pretty soon.