First of all, this is obscenely, obscenely late, and for that I do apologize. (In truth, I thought I'd already written this, and then when I went to go back and grab the link for it, I realized that, hey, SOMETHING WAS MISSING. So, hopefully this is better late than never.)
Second of all, THANK YOU for participating in the Yuletide Challenge this year, and thank you for the story you're about to write.
In truth, I'm pretty easy to please, but then I bet everyone thinks that of themselves :). Generally, I'm not a huge fan of slash, and that is... pretty much my only squick. I've requested all canon "pairings" (though I agree that it's debatable whether Rae and Con are a "pairing"-- but I love their chemistry and their exchanges), so that probably illustrates that right there. I'm also a complete sucker for holiday-themed stories. A COMPLETE sucker. Take that as you will. :D
Okay, so I requested Jennifer Crusie's novel Faking It. Obviously my favorite pairing is Davy and Tilda, so anything with them... being Davy and Tilda at each other would be fantastic. Something post-novel would be good, and if you'd like to throw in any of the other characters, that would be fantastic. (Am also open to cross-overs with other Crusie novels, but that's up to you.)
As for the Sayersverse, I have always envied people who can write a mystery. If you're one of those people, a mystery would be WONDERFUL. However, being someone who has a hard time writing a mystery, I completely understand if that's not doable. I love Peter and Harriet, and positively adore their banter and piffle. I also love every phase of their relationship, from the awkwardness in the beginning, to Harriet's stubbornness and Peter's determination, to the point where everything FINALLY comes to fruition. (I do confess a fondness for seeing them married, however, but it is not strictly necessary.)
And, finally, Sunshine. This is the first year I've requested anything from this fandome, but I do love the chemistry Sunshine and Con share. Whether you take this down a romantic road or not is entirely up to you. I... really don't know what to ask for here! I love Con, love him to utter bits, and Rae's wry observances and smart mouth are the things I love most about her. Something post-novel would be good, or if you can figure out a way to tuck something within the framework of the book, that's fine too. I'm curious about Con's history, so maybe he could open up a little more about that?