11:13 video
The brush, or brushing has a truly relaxing effect upon the models of Stone Fetish, it seems that all of them simply love the feeling of the harder brush being dragged along their backs, and Shy indeed echoed a similar sound as she was soon sighing out loudly from the way that the brush moved over her body.
As compared to the Brushing, the Feather Tickler are indeed a polar opposite of that sensation, when two feathers are used together that's truly doubling of the effects, but to Shy she was really hoping for more Brushing time(s).
That wish was indeed soon granted.