Afer looking at your tutorials I decided you'd got most bases covered, then I thought of one more. I simply got some self stick velcro and put it over the top of the vibrating wand. Tried it on myself - didn't have a victim handy :( - Very lightly on the tits it gets quite sore quite fast, interestingly I found the harder you press the easier it becomes to bear. I could see a sub tied horizontally and tight so no upward movement allowed, then the wand lowered to hang just scratching the skin of the nipple. On a medium slow speed he'll think it's easy, for a while anyway..........