A month ago a couple came to our local BDSM club. It was a night mostly for beginning kinksters and we got into a conversation. They regretted not bringing their gear (amateur low end stuff), so I offered them to use some of mine. Apparently the guy didn't know how to handle my floggers, whips and paddles. I showed him how to use them and after a bit I was spanking his girlfriend solo. Yesterday the guy sent me a message on Fetlife. He organizes gangbangs and asks if I want to give a demo on her. I'm flattered he wants me to do this, but could use some advise on do's and dont's. Also would like to know how this can fit into a gangbang (never been to one and I'm not interested in going since it's not my thing).

Edit: spelling and typo