I did the same when I wrote my very first fic, wrote it in Justin's voice. The second fic I wrote, I was just observing Brian, writing down whatever he does. He let me peek inside his head but really, his actions speaks louder than his words. When I told my good friend, who by the way is a HUGE rian fanatic ( kittykat2305 ) about this, she told me, Brian is STRAIGHTFORWARD and SIMPLE. Which is very true. It's still hard to write Brian's thoughts, but I always think what my friend told me. You have to really accept Brian and how harsh he is, MOST of the time, and realize, that's who he is, and his voice will come.