This is great. I happen to think that Arya is probably permanently twisted, and I like the way you've written her here. She's damaged and doesn't have to follow the same rules as everyone else, and yet, there's something Jaime admires about her. So much so that he's actually willing to play messenger boy.

The underlying hints of Jaime/Sansa do a fangirl good, but I like how it's just an undercurrent to the real interaction at play here.