Flicking is one of those things that seems like a pretty mild sensation but can actually build to something really intense.The trick is not to aim for a single strong flick, but use a repeated series of flicks to the same spot. The exact periodicity or rhythm doesn’t matter, you just want to get a small group of nerves constantly singing.
From a psychological perspective it’s a bit like an itch or someone constantly poking you. After a bit you just want to yell ‘Goddamn it! Stop that.’ From a physical perspective focusing in one spot can really exaggerate the sensation. I’m not sure what the underlying mechanism in the nervous system is, but it seems to be a cumulative one, where the pain gradually builds. This is particularly the case when the spot is a sensitive one to start with.
I’m afraid I don’t know the source of this image, although if I had to guess, I’d say it was one of the kink.com sites. I found it on the Please Take My Control tumblr.
Updated: Thanks to a very helpful comment from François I can confirm it’s a kink image, specifically from Men In Pain and features Miss Brooke and Andy Mann.
I’ve found the video. It’s from Men in pain website
more about it there
http://www.freudbox.com/video_174008_brooke-banner-men-in-pain-trailer-8.html
and more pictures there
http://www.definefetish.com/gallery/4jj/brooke-banner/
and there
https://www.kink.com/shoot/2195
Thanks a lot for the pointer! I’ll update the post with a suitable link.
-paltego