Very well done. I like it! Your picture of their relationship was great. I can imagine Obi Wan wanting to celebrate an anniversary. You wrote him very well. There aren't too many good SiriWan fics, so I'm glad to find this.
One thing, I was confused at the end with the sudden appearance of Luke and Anakin. They appeared out of nowhere, and wasn't Siri just talking to Trevor? Anyway, I had to read it again to realize what was going on. The transition could be written smoother.

Thanks for this charmer! If these two really could have a relationship, this is what it would be like. You've really captured both Obi-Wan's and Siri's personalities. I can't find anything to be improved.

I enjoyed that alot. You really captured Obi Wan's voice.