The Bogas Bros. put some newcomers through the business in typical Bogas style, then there's a scene that seems tacked on at the last minute.  There are some interesting situations, but unusual stuff -- like Heaven Lee pressing her foot against one brother's balls as he strokes off, or one of the guys licking her asshole as she sits perched on a stool -- aren't fully developed.  More of this plus the conventional stuff would have boosted the rating.