Very nice, as with all the rest it's really well written and has a terrific plot.
As far as suggestions, I think this chapter needs more conflict or tension...it begins well, and I love Lynn's hidden bdsm life bubbling to the surface, but it felt like Sarah capitulated a bit too easily; it would be improved by a bit of a chase, some scheming between Lynn and Sam or at least a bit more ebb and flow.
I do like the idea of the two struggling to not fall in love, though; sweet irony!