So, I was browsing FF.net one day a long time ago, and found this gem. It is a Vala/Daniel fic, over 100 thousand words, rated pg-13 (mostly, nothing too mature)and is an AU that feels like it would make a great movie.

http://www.fanfiction.net/s/3394910/1/HonorAmongstThieves

It lives up to the name of adventure it is listed under, and is partially series compliant.