We once visited a professional dominatrix who gently scrubbed our freshly-spanked bottom with the bristle side of her bath brush and then applied rubbing alcohol to the abraded skin. The alcohol was refreshingly cool at first and then — YEOW — it turned into liquid fire.
Miss Scarlet of Vixen Ladies takes a more aggressive approach to using the bristles — she SPANKS with them. While this porcupine treatment may produce a new, prickley sensation, it can also put pinholes in the skin. (Just something to keep in mind if you’re going to try this at home.)