Posted before about my coworker standing really close when talking. Our company provided us lunch and I went to serve myself and she was serving at the same time. She moved and went right next to me and pressed her body against mine and we served food. After lunch we walked back to the office and basically were pressed against each other looking into each other's eyes while talking. We paused at her desk and said a few jokes quietly while leaning in and basically whispering in each other's ears. At the end of the day she asked me to walk her to her car. I'm planning to make a move at our holiday party coming up. Any advice on how to not blow it?