OMG, so good to know that there's someone as pervilicious as me who actually studies the B/J sex sounds!! Awesome examples.
He also has a whine that's a lot huskier and lower and louder than his whimpers. This is one of my favorite of his sounds. One example is the whine he gives when Brian sinks his cock into him after saying, "I want you safe"
One of the most delicious things about Randy Harrison as Justin Taylor is that he looks like a tiny twink angel, but has that deep voice. That is one of my favorite scenes, too, only what I hear are breathy grunts. I guess sexsounds are in the ear of the listener!
Can you think of an instance of Brian whimpering or yelping during sex? That comes up in fanfic, too, and I just can't hear it.