I very much enjoyed the chapter.  The second giantess was an unexpected but very welcome surprise.  I thought the the teasing interactions between the giantesses and the tiny couple were very well-written and a nice breath of fresh air, and Brooke trying to force them to have sex in her cleavage was a fantastic idea.  So often giantess interaction falls into the same motiveless cliches, but you really brought out a playfully cruel side in Brooke.  I also enjoyed the idea of the tiny characters being small enough to explore the bra strap as a ledge: I haven't seen many authors do this, so points for originality! You have a discriptive style and wonderful, original ideas, and I'm curious about where you'd be able to go with a longer breast-play chapter in the future, as well as incorporating the second giantess a little bit more into that scenario (and the story as a whole).  For a first go at a breast-focused chapter, you did very well; as for the chapter as part of the story as a whole, you've set up the action nicely, and seem to have a knack at pacing the story in a way to keep the reader wanting to see the next chapter.