Eeee, thank you so much! I'm really glad you enjoyed it. :D

I am not the first, however. oxoniensis wrote a SPN/HDM crossover (http://oxoniensis.livejournal.com/343411.html), and more recently kellifer_fic did too (http://kellifer-fic.livejournal.com/312853.html). It strikes me I read another one at some point but I can't find it.