What present would Cara have gotten Aelyx for Christmas, if things hadn't gotten out of hand before?
Ooooh, this is a really good question! Before I answer it, I'd like to point out that Aelyx and Cara will get the chance to celebrate Christmas together in the short story "Until Midnight," which releases for free sometime in December. Here's a link: https://www.goodreads.com/book/show/2...
Now to answer your question. If they had remained on Earth, Cara would have bought something personalized for Aelyx to remind him of their time together, like a recordable keepsake box with a picture of them on the lid. Knowing Cara, the message she recorded for him would be cheeky, and she'd probably put a few of Aelyx's favorite things inside the box, for example, an assortment of dried leaves and her Puppy Love game. :)