Who is Brick from Rainbow Boys and what is their importance?

Brick is the twenty-nine-year-old stranger that Nelson loses his virginity to. Nelson and Brick had been flirting online and on the evening that Nelson's father stands him up for Christmas, Nelson is desperate for some affection. When Brick suggests that they hook-up, Nelson agrees and the two have unprotected sex. Brick later reveals that he already has a boyfriend and that he has no intention of starting a relationship with Nelson.