Oooh, yay for Cas! Having two of them (and both male, to boot) will confuse Sam here a little, but she'll handle it. You've probably already noticed that basically her AU is that she is female-- there are a couple other minor edits we made to their world to make things work, but that's the biggest thing he'll probably notice.
I'm Annalisa, and I look forward to playing with you! Welcome to the game :D