In the four part Japanese essay structure, 起承転結 kishoutenketsu, the third part, ten/転, is the moment of re-contextualization. It's the bit of information he reader requires to finally grasp the author's thesis, because it puts all of the previous information into the proper context that's needed to make sense of it.
It doesn't really work in this case, but maybe we can argue that the main character here has a little moment of "ten." He came in expecting one thing (a superficial experience with a shallow person), and suddenly discovered her humanity, leading him to re-evaluate his initial assumptions. That's all it is. The "helping her parents" bit is a kind of shorthand for suggesting her moral virtue (devotion to her parents), and I guess the farm bit undercuts the general perception of sex workers as "slick, sophisticated, city-types."