Dom is an old friend of Brian's Brian O'Conner has known him for a couple of years now, and even though Brian know's him pretty damn well, he still intimidates the hell out of Brian

After falling asleep in His car, which was parked in front of the Toretto house, Dom dragged Brian inside and confronted Brian about it.

"So, what were you doing parked in front of my house?" He asked, but he didn't sound mad..Upset,Angry...or pissed. He actually seemed pretty calm more than anything.